Merge pull request #404 from anandolee/master

Add oneof support for c#

39 files changed, 4720 insertions, 2163 deletions

diff --git a/csharp/src/ProtocolBuffers.Test/AbstractMessageTest.cs b/csharp/src/ProtocolBuffers.Test/AbstractMessageTest.cs
index 595fb3ae..8118808b 100644
--- a/csharp/src/ProtocolBuffers.Test/AbstractMessageTest.cs
+++ b/csharp/src/ProtocolBuffers.Test/AbstractMessageTest.cs
@@ -374,6 +374,16 @@ namespace Google.ProtocolBuffers
                 return wrappedMessage.HasField(field);

             }

 

+            public override bool HasOneof(OneofDescriptor oneof)

+            {

+                return wrappedMessage.HasOneof(oneof);

+            }

+

+            public override FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof)

+            {

+                return wrappedMessage.OneofFieldDescriptor(oneof);

+            }

+

             public override object this[FieldDescriptor field]

             {

                 get { return wrappedMessage[field]; }

@@ -461,6 +471,16 @@ namespace Google.ProtocolBuffers
                     return wrappedBuilder.HasField(field);

                 }

 

+                public override bool HasOneof(OneofDescriptor oneof)

+                {

+                    return wrappedBuilder.HasOneof(oneof);

+                }

+

+                public override FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof)

+                {

+                    return wrappedBuilder.OneofFieldDescriptor(oneof);

+                }

+

                 public override UnknownFieldSet UnknownFields

                 {

                     get { return wrappedBuilder.UnknownFields; }

@@ -493,6 +513,12 @@ namespace Google.ProtocolBuffers
                     return this;

                 }

 

+                public override Builder ClearOneof(OneofDescriptor oneof)

+                {

+                    wrappedBuilder.WeakClearOneof(oneof);

+                    return this;

+                }

+

                 public override Builder AddRepeatedField(FieldDescriptor field, object value)

                 {

                     wrappedBuilder.WeakAddRepeatedField(field, value);

diff --git a/csharp/src/ProtocolBuffers.Test/DynamicMessageTest.cs b/csharp/src/ProtocolBuffers.Test/DynamicMessageTest.cs
index d38d66d7..f60db213 100644
--- a/csharp/src/ProtocolBuffers.Test/DynamicMessageTest.cs
+++ b/csharp/src/ProtocolBuffers.Test/DynamicMessageTest.cs
@@ -36,6 +36,7 @@
 

 using System;

 using System.Collections.Generic;

+using Google.ProtocolBuffers.Descriptors;

 using Google.ProtocolBuffers.TestProtos;

 using NUnit.Framework;

 

@@ -200,6 +201,21 @@ namespace Google.ProtocolBuffers
 

             DynamicMessage copy = DynamicMessage.CreateBuilder(message).Build();

             reflectionTester.AssertAllFieldsSetViaReflection(copy);

+

+            // Oneof

+            FieldDescriptor bytesField =

+                TestAllTypes.Descriptor.FindFieldByName("oneof_bytes");

+            FieldDescriptor uint32Field =

+                TestAllTypes.Descriptor.FindFieldByName("oneof_uint32");

+            Assert.True(copy.HasField(bytesField));

+            Assert.False(copy.HasField(uint32Field));

+

+            DynamicMessage.Builder dynamicBuilder = DynamicMessage.CreateBuilder(message);

+            dynamicBuilder[uint32Field] = 123U;

+            DynamicMessage copy2 = dynamicBuilder.Build();

+            Assert.IsFalse(copy2.HasField(bytesField));

+            Assert.IsTrue(copy2.HasField(uint32Field));

+            Assert.AreEqual(123U, copy2[uint32Field]);

         }

 

         [Test]

@@ -223,5 +239,38 @@ namespace Google.ProtocolBuffers
             Assert.AreEqual(1, values.Count);

             Assert.AreEqual(unknownFieldVal, values[0]);

         }

+

+        [Test]

+        public void DynamicOneofMessage()

+        {

+            DynamicMessage.Builder builder =

+                DynamicMessage.CreateBuilder(TestAllTypes.Descriptor);

+            OneofDescriptor oneof = TestAllTypes.Descriptor.Oneofs[0];

+            Assert.False(builder.HasOneof(oneof));

+            Assert.AreSame(null, builder.OneofFieldDescriptor(oneof));

+

+            reflectionTester.SetAllFieldsViaReflection(builder);

+            Assert.True(builder.HasOneof(oneof));

+            FieldDescriptor field = oneof.Field(3);

+            Assert.AreSame(field, builder.OneofFieldDescriptor(oneof));

+            Assert.AreEqual(TestUtil.ToBytes("604"), builder[field]);

+

+            DynamicMessage message = builder.BuildPartial();

+            Assert.IsTrue(message.HasOneof(oneof));

+            

+            DynamicMessage.Builder mergedBuilder =

+                DynamicMessage.CreateBuilder(TestAllTypes.Descriptor);

+            FieldDescriptor mergedField = oneof.Field(0);

+            mergedBuilder[mergedField] = 123U;

+            Assert.IsTrue(mergedBuilder.HasField(mergedField));

+            mergedBuilder.MergeFrom(message);

+            Assert.IsTrue(mergedBuilder.HasField(field));

+            Assert.IsFalse(mergedBuilder.HasField(mergedField));

+

+            mergedBuilder.ClearOneof(oneof);

+            Assert.AreSame(null, mergedBuilder.OneofFieldDescriptor(oneof));

+            message = mergedBuilder.Build();

+            Assert.AreSame(null, message.OneofFieldDescriptor(oneof));

+        }

     }

 }
\ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers.Test/FieldPresenceTest.cs b/csharp/src/ProtocolBuffers.Test/FieldPresenceTest.cs
index 8f59334e..66214221 100644
--- a/csharp/src/ProtocolBuffers.Test/FieldPresenceTest.cs
+++ b/csharp/src/ProtocolBuffers.Test/FieldPresenceTest.cs
@@ -59,16 +59,25 @@ namespace Google.ProtocolBuffers
             CheckHasMethodRemoved(proto2Type, proto3Type, "OptionalBytes");

             CheckHasMethodRemoved(proto2Type, proto3Type, "OptionalNestedEnum");

             

-            proto2Type = typeof(Google.ProtocolBuffers.TestProtos.TestAllTypes.Builder);

-            proto3Type = typeof(TestAllTypes.Builder);

-            CheckHasMethodRemoved(proto2Type, proto3Type, "OptionalInt32");

-            CheckHasMethodRemoved(proto2Type, proto3Type, "OptionalString");

-            CheckHasMethodRemoved(proto2Type, proto3Type, "OptionalBytes");

-            CheckHasMethodRemoved(proto2Type, proto3Type, "OptionalNestedEnum");

+            Type proto2BuilderType = typeof(Google.ProtocolBuffers.TestProtos.TestAllTypes.Builder);

+            Type proto3BuilderType = typeof(TestAllTypes.Builder);

+            CheckHasMethodRemoved(proto2BuilderType, proto3BuilderType, "OptionalInt32");

+            CheckHasMethodRemoved(proto2BuilderType, proto3BuilderType, "OptionalString");

+            CheckHasMethodRemoved(proto2BuilderType, proto3BuilderType, "OptionalBytes");

+            CheckHasMethodRemoved(proto2BuilderType, proto3BuilderType, "OptionalNestedEnum");

 

             // message fields still have the HasFoo method generated

             Assert.IsFalse(TestAllTypes.CreateBuilder().Build().HasOptionalNestedMessage);

             Assert.IsFalse(TestAllTypes.CreateBuilder().HasOptionalNestedMessage);

+

+            // oneof fields don't have the HasFoo method (even for message types)

+            CheckHasMethodRemoved(proto2Type, proto3Type, "OneofUint32");

+            CheckHasMethodRemoved(proto2Type, proto3Type, "OneofString");

+            CheckHasMethodRemoved(proto2Type, proto3Type, "OneofNestedMessage");

+

+            CheckHasMethodRemoved(proto2BuilderType, proto3BuilderType, "OneofUint32");

+            CheckHasMethodRemoved(proto2BuilderType, proto3BuilderType, "OneofString");

+            CheckHasMethodRemoved(proto2BuilderType, proto3BuilderType, "OneofNestedMessage");

         }

 

         [Test]

@@ -114,6 +123,7 @@ namespace Google.ProtocolBuffers
             FieldDescriptor optionalStringField = descriptor.FindFieldByName("optional_string");

             FieldDescriptor optionalBytesField = descriptor.FindFieldByName("optional_bytes");

             FieldDescriptor optionalNestedEnumField = descriptor.FindFieldByName("optional_nested_enum");

+            FieldDescriptor oneofUint32Field = descriptor.FindFieldByName("oneof_uint32");

 

             TestAllTypes message = TestAllTypes.CreateBuilder().Build();

             Assert.IsFalse(message.HasField(optionalInt32Field));

@@ -121,20 +131,23 @@ namespace Google.ProtocolBuffers
             Assert.IsFalse(message.HasField(optionalBytesField));

             Assert.IsFalse(message.HasField(optionalNestedEnumField));

 

-            // Set to default value is seen as not present

+            // Set to default value is seen as not present for optional fields.

+            // Set to default value is seen as present for oneof fields.

             message = TestAllTypes.CreateBuilder()

                 .SetOptionalInt32(0)

                 .SetOptionalString("")

                 .SetOptionalBytes(ByteString.Empty)

                 .SetOptionalNestedEnum(TestAllTypes.Types.NestedEnum.FOO)

+                .SetOneofUint32(0U)

                 .Build();

             Assert.IsFalse(message.HasField(optionalInt32Field));

             Assert.IsFalse(message.HasField(optionalStringField));

             Assert.IsFalse(message.HasField(optionalBytesField));

             Assert.IsFalse(message.HasField(optionalNestedEnumField));

-            Assert.AreEqual(0, message.AllFields.Count);

+            Assert.IsTrue(message.HasField(oneofUint32Field));

+            Assert.AreEqual(1, message.AllFields.Count);

             

-            // Set t0 non-defalut value is seen as present

+            // Set to non-defalut value is seen as present

             message = TestAllTypes.CreateBuilder()

                 .SetOptionalInt32(1)

                 .SetOptionalString("x")

@@ -169,6 +182,7 @@ namespace Google.ProtocolBuffers
             builder.SetOptionalInt32(1234);

             builder.SetOptionalString("hello");

             builder.SetOptionalNestedMessage(TestAllTypes.Types.NestedMessage.DefaultInstance);

+            builder.SetOneofUint32(0U);

             ByteString data = builder.Build().ToByteString();

 

             TestAllTypes message = TestAllTypes.ParseFrom(data);

@@ -178,6 +192,7 @@ namespace Google.ProtocolBuffers
             Assert.AreEqual(TestAllTypes.Types.NestedEnum.FOO, message.OptionalNestedEnum);

             Assert.IsTrue(message.HasOptionalNestedMessage);

             Assert.AreEqual(0, message.OptionalNestedMessage.Bb);

+            Assert.AreEqual(TestAllTypes.OneofFieldOneofCase.OneofUint32, message.OneofFieldCase);

         }

     }

 }

diff --git a/csharp/src/ProtocolBuffers.Test/GeneratedMessageTest.cs b/csharp/src/ProtocolBuffers.Test/GeneratedMessageTest.cs
index 984c36e6..4f669449 100644
--- a/csharp/src/ProtocolBuffers.Test/GeneratedMessageTest.cs
+++ b/csharp/src/ProtocolBuffers.Test/GeneratedMessageTest.cs
@@ -36,6 +36,7 @@
 

 using System;

 using System.Collections.Generic;

+using Google.ProtocolBuffers.Descriptors;

 using Google.ProtocolBuffers.Collections;

 using Google.ProtocolBuffers.TestProtos;

 using NUnit.Framework;

@@ -292,6 +293,31 @@ namespace Google.ProtocolBuffers
                                                 });

         }

 

+        [Test]

+        public void ReflectionGetOneof()

+        {

+            TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();

+            reflectionTester.SetAllFieldsViaReflection(builder);

+            Descriptors.OneofDescriptor oneof = TestAllTypes.Descriptor.Oneofs[0];

+            Descriptors.FieldDescriptor field = TestAllTypes.Descriptor.FindFieldByName("oneof_bytes");

+            Assert.AreSame(field, builder.OneofFieldDescriptor(oneof));

+        }

+

+        [Test]

+        public void ReflectionClearOneof()

+        {

+            TestAllTypes.Builder builder = TestAllTypes.CreateBuilder();

+            reflectionTester.SetAllFieldsViaReflection(builder);

+            OneofDescriptor oneof = TestAllTypes.Descriptor.Oneofs[0];

+            FieldDescriptor field = TestAllTypes.Descriptor.FindFieldByName("oneof_bytes");

+

+            Assert.IsTrue(builder.HasOneof(oneof));

+            Assert.IsTrue(builder.HasField(field));

+            builder.ClearOneof(oneof);

+            Assert.IsFalse(builder.HasOneof(oneof));

+            Assert.IsFalse(builder.HasField(field));

+        }

+

         // =================================================================

         // Extensions.

 

@@ -510,5 +536,241 @@ namespace Google.ProtocolBuffers
             TestPackedTypes empty = new TestPackedTypes.Builder().Build();

             Assert.AreEqual(0, empty.SerializedSize);

         }

+

+        // oneof tests

+        [Test]

+        public void TestOneofEnumCase()

+        {

+            TestOneof2 message = TestOneof2.CreateBuilder()

+                .SetFooInt(123).SetFooString("foo").SetFooCord("bar").Build();

+            TestUtil.AssertAtMostOneFieldSetOneof(message);

+        }

+

+        [Test]

+        public void TestClearOneof()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder().SetFooInt(123);

+            Assert.AreEqual(TestOneof2.FooOneofCase.FooInt, builder.FooCase);

+            builder.ClearFoo();

+            Assert.AreEqual(TestOneof2.FooOneofCase.None, builder.FooCase);

+        }

+

+        [Test]

+        public void TestSetOneofClearsOthers()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message =

+                builder.SetFooInt(123).SetFooString("foo").Build();

+            Assert.IsTrue(message.HasFooString);

+            TestUtil.AssertAtMostOneFieldSetOneof(message);

+

+            message = builder.SetFooCord("bar").Build();

+            Assert.IsTrue(message.HasFooCord);

+            TestUtil.AssertAtMostOneFieldSetOneof(message);

+

+            message = builder.SetFooStringPiece("baz").Build();

+            Assert.IsTrue(message.HasFooStringPiece);

+            TestUtil.AssertAtMostOneFieldSetOneof(message);

+

+            message = builder.SetFooBytes(TestUtil.ToBytes("qux")).Build();

+            Assert.IsTrue(message.HasFooBytes);

+            TestUtil.AssertAtMostOneFieldSetOneof(message);

+

+            message = builder.SetFooEnum(TestOneof2.Types.NestedEnum.FOO).Build();

+            Assert.IsTrue(message.HasFooEnum);

+            TestUtil.AssertAtMostOneFieldSetOneof(message);

+

+            message = builder.SetFooMessage(

+                TestOneof2.Types.NestedMessage.CreateBuilder().SetQuxInt(234).Build()).Build();

+            Assert.IsTrue(message.HasFooMessage);

+            TestUtil.AssertAtMostOneFieldSetOneof(message);

+

+            message = builder.SetFooInt(123).Build();

+            Assert.IsTrue(message.HasFooInt);

+            TestUtil.AssertAtMostOneFieldSetOneof(message);

+        }

+

+        [Test]

+        public void TestOneofTypes_Primitive()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            Assert.AreEqual(builder.FooInt, 0);

+            Assert.IsFalse(builder.HasFooInt);

+            Assert.IsTrue(builder.SetFooInt(123).HasFooInt);

+            Assert.AreEqual(builder.FooInt, 123);

+            TestOneof2 message = builder.BuildPartial();

+            Assert.IsTrue(message.HasFooInt);

+            Assert.AreEqual(message.FooInt, 123);

+

+            Assert.IsFalse(builder.ClearFooInt().HasFooInt);

+            TestOneof2 message2 = builder.Build();

+            Assert.IsFalse(message2.HasFooInt);

+            Assert.AreEqual(message2.FooInt, 0);

+        }

+

+        [Test]

+        public void TestOneofTypes_Enum()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            Assert.AreEqual(builder.FooEnum, TestOneof2.Types.NestedEnum.FOO);

+            Assert.IsTrue(builder.SetFooEnum(TestOneof2.Types.NestedEnum.BAR).HasFooEnum);

+            Assert.AreEqual(builder.FooEnum, TestOneof2.Types.NestedEnum.BAR);

+            TestOneof2 message = builder.BuildPartial();

+            Assert.IsTrue(message.HasFooEnum);

+            Assert.AreEqual(message.FooEnum, TestOneof2.Types.NestedEnum.BAR);

+

+            Assert.IsFalse(builder.ClearFooEnum().HasFooEnum);

+            TestOneof2 message2 = builder.Build();

+            Assert.IsFalse(message2.HasFooEnum);

+            Assert.AreEqual(message2.FooEnum, TestOneof2.Types.NestedEnum.FOO);

+        }

+

+        [Test]

+        public void TestOneofTypes_String()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            Assert.AreEqual(builder.FooString, "");

+            Assert.IsTrue(builder.SetFooString("foo").HasFooString);

+            Assert.AreEqual(builder.FooString, "foo");

+            TestOneof2 message = builder.BuildPartial();

+            Assert.IsTrue(message.HasFooString);

+            Assert.AreEqual(message.FooString, "foo");

+

+            Assert.IsFalse(builder.ClearFooString().HasFooString);

+            TestOneof2 message2 = builder.Build();

+            Assert.IsFalse(message2.HasFooString);

+            Assert.AreEqual(message2.FooString, "");

+

+            builder.SetFooInt(123);

+            Assert.AreEqual(builder.FooString, "");

+            Assert.AreEqual(builder.FooInt, 123);

+            message = builder.Build();

+            Assert.AreEqual(message.FooString, "");

+            Assert.AreEqual(message.FooInt, 123);

+        }

+

+        [Test]

+        public void TestOneofTypes_Message()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            Assert.AreEqual(builder.FooMessage.QuxInt, 0);

+            builder.SetFooMessage(TestOneof2.Types.NestedMessage.CreateBuilder().SetQuxInt(234).Build());

+            Assert.IsTrue(builder.HasFooMessage);

+            Assert.AreEqual(builder.FooMessage.QuxInt, 234);

+            TestOneof2 message = builder.BuildPartial();

+            Assert.IsTrue(message.HasFooMessage);

+            Assert.AreEqual(message.FooMessage.QuxInt, 234);

+

+            Assert.IsFalse(builder.ClearFooMessage().HasFooMessage);

+            message = builder.Build();

+            Assert.IsFalse(message.HasFooMessage);

+            Assert.AreEqual(message.FooMessage.QuxInt, 0);

+

+            builder = TestOneof2.CreateBuilder();

+            Assert.IsFalse(builder.HasFooMessage);

+            builder.SetFooMessage(TestOneof2.Types.NestedMessage.CreateBuilder().SetQuxInt(123));

+            Assert.IsTrue(builder.HasFooMessage);

+            Assert.AreEqual(builder.FooMessage.QuxInt, 123);

+            message = builder.Build();

+            Assert.IsTrue(message.HasFooMessage);

+            Assert.AreEqual(message.FooMessage.QuxInt, 123);

+        }

+

+        [Test]

+        public void TestOneofMerge_Primitive()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message = builder.SetFooInt(123).Build();

+            TestOneof2 message2 = TestOneof2.CreateBuilder().MergeFrom(message).Build();

+            Assert.IsTrue(message2.HasFooInt);

+            Assert.AreEqual(message2.FooInt, 123);

+        }

+

+        [Test]

+        public void TestOneofMerge_String()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message = builder.SetFooString("foo").Build();

+            TestOneof2 message2 = TestOneof2.CreateBuilder().MergeFrom(message).Build();

+            Assert.IsTrue(message2.HasFooString);

+            Assert.AreEqual(message2.FooString, "foo");

+        }

+

+        [Test]

+        public void TestOneofMerge_Enum()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message = builder.SetFooEnum(TestOneof2.Types.NestedEnum.BAR).Build();

+            TestOneof2 message2 = TestOneof2.CreateBuilder().MergeFrom(message).Build();

+            Assert.IsTrue(message2.HasFooEnum);

+            Assert.AreEqual(message2.FooEnum, TestOneof2.Types.NestedEnum.BAR);

+        }

+

+        public void TestOneofMerge_message()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message = builder.SetFooMessage(

+                TestOneof2.Types.NestedMessage.CreateBuilder().SetQuxInt(234).Build()).Build();

+            TestOneof2 message2 = TestOneof2.CreateBuilder().MergeFrom(message).Build();

+            Assert.IsTrue(message2.HasFooMessage);

+            Assert.AreEqual(message2.FooMessage.QuxInt, 234);

+        }

+

+        [Test]

+        public void TestOneofMergeMixed()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message = builder.SetFooEnum(TestOneof2.Types.NestedEnum.BAR).Build();

+            TestOneof2 message2 =

+                TestOneof2.CreateBuilder().SetFooString("foo").MergeFrom(message).Build();

+            Assert.IsFalse(message2.HasFooString);

+            Assert.IsTrue(message2.HasFooEnum);

+            Assert.AreEqual(message2.FooEnum, TestOneof2.Types.NestedEnum.BAR);

+        }

+

+        [Test]

+        public void TestOneofSerialization_Primitive()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message = builder.SetFooInt(123).Build();

+            ByteString serialized = message.ToByteString();

+            TestOneof2 message2 = TestOneof2.ParseFrom(serialized);

+            Assert.IsTrue(message2.HasFooInt);

+            Assert.AreEqual(message2.FooInt, 123);

+        }

+

+        [Test]

+        public void TestOneofSerialization_String()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message = builder.SetFooString("foo").Build();

+            ByteString serialized = message.ToByteString();

+            TestOneof2 message2 = TestOneof2.ParseFrom(serialized);

+            Assert.IsTrue(message2.HasFooString);

+            Assert.AreEqual(message2.FooString, "foo");

+        }

+

+        [Test]

+        public void TestOneofSerialization_Enum()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message = builder.SetFooEnum(TestOneof2.Types.NestedEnum.BAR).Build();

+            ByteString serialized = message.ToByteString();

+            TestOneof2 message2 = TestOneof2.ParseFrom(serialized);

+            Assert.IsTrue(message2.HasFooEnum);

+            Assert.AreEqual(message2.FooEnum, TestOneof2.Types.NestedEnum.BAR);

+        }

+

+        [Test]

+        public void TestOneofSerialization_Message()

+        {

+            TestOneof2.Builder builder = TestOneof2.CreateBuilder();

+            TestOneof2 message = builder.SetFooMessage(

+                TestOneof2.Types.NestedMessage.CreateBuilder().SetQuxInt(234).Build()).Build();

+            ByteString serialized = message.ToByteString();

+            TestOneof2 message2 = TestOneof2.ParseFrom(serialized);

+            Assert.IsTrue(message2.HasFooMessage);

+            Assert.AreEqual(message2.FooMessage.QuxInt, 234);

+        }

     }

 }
\ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers.Test/ReflectionTester.cs b/csharp/src/ProtocolBuffers.Test/ReflectionTester.cs
index bd1d2c65..22795b3f 100644
--- a/csharp/src/ProtocolBuffers.Test/ReflectionTester.cs
+++ b/csharp/src/ProtocolBuffers.Test/ReflectionTester.cs
@@ -380,6 +380,12 @@ namespace Google.ProtocolBuffers
 

             message[f("default_string_piece")] = "424";

             message[f("default_cord")] = "425";

+

+            message[f("oneof_uint32")] = 601U;

+            message[f("oneof_nested_message")] =

+                CreateBuilderForField(message, f("optional_nested_message")).SetField(nestedB, 602).WeakBuild();

+            message[f("oneof_string")] = "603";

+            message[f("oneof_bytes")] = TestUtil.ToBytes("604");

         }

 

         /// <summary>

@@ -642,6 +648,20 @@ namespace Google.ProtocolBuffers
 

             Assert.AreEqual("424", message[f("default_string_piece")]);

             Assert.AreEqual("425", message[f("default_cord")]);

+            if (extensionRegistry == null)

+            {

+                Assert.IsFalse(message.HasField(f("oneof_uint32")));

+                Assert.IsFalse(message.HasField(f("oneof_nested_message")));

+                Assert.IsFalse(message.HasField(f("oneof_string")));

+            } else

+            {

+                Assert.IsTrue(message.HasField(f("oneof_uint32")));

+                Assert.IsTrue(message.HasField(f("oneof_nested_message")));

+                Assert.IsTrue(message.HasField(f("oneof_string")));

+                Assert.AreEqual(601U, message[f("oneof_uint32")]);

+                Assert.AreEqual(602, ((IMessage)message[f("oneof_nested_message")])[nestedB]);

+                Assert.AreEqual("603", message[f("oneof_string")]);

+            }

         }

 

         /// <summary>

@@ -793,6 +813,15 @@ namespace Google.ProtocolBuffers
 

             Assert.AreEqual("abc", message[f("default_string_piece")]);

             Assert.AreEqual("123", message[f("default_cord")]);

+

+            Assert.IsFalse(message.HasField(f("oneof_uint32")));

+            Assert.IsFalse(message.HasField(f("oneof_nested_message")));

+            Assert.IsFalse(message.HasField(f("oneof_string")));

+            Assert.IsFalse(message.HasField(f("oneof_bytes")));

+

+            Assert.AreEqual(0U, message[f("oneof_uint32")]);

+            Assert.AreEqual("", message[f("oneof_string")]);

+            Assert.AreEqual(TestUtil.ToBytes(""), message[f("oneof_bytes")]);

         }

 

         // ---------------------------------------------------------------

@@ -1001,4 +1030,4 @@ namespace Google.ProtocolBuffers
             Assert.AreEqual(foreignBaz, message[f("packed_enum"), 1]);

         }

     }

-}
\ No newline at end of file
+}
diff --git a/csharp/src/ProtocolBuffers.Test/TestProtos/Unittest.cs b/csharp/src/ProtocolBuffers.Test/TestProtos/Unittest.cs
index 083523c0..67898644 100644
--- a/csharp/src/ProtocolBuffers.Test/TestProtos/Unittest.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestProtos/Unittest.cs
@@ -355,6 +355,8 @@ namespace Google.ProtocolBuffers.TestProtos {
     internal static pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDeprecatedFields, global::Google.ProtocolBuffers.TestProtos.TestDeprecatedFields.Builder> internal__static_protobuf_unittest_TestDeprecatedFields__FieldAccessorTable;
     internal static pbd::MessageDescriptor internal__static_protobuf_unittest_ForeignMessage__Descriptor;
     internal static pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.ForeignMessage, global::Google.ProtocolBuffers.TestProtos.ForeignMessage.Builder> internal__static_protobuf_unittest_ForeignMessage__FieldAccessorTable;
+    internal static pbd::MessageDescriptor internal__static_protobuf_unittest_TestReservedFields__Descriptor;
+    internal static pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestReservedFields, global::Google.ProtocolBuffers.TestProtos.TestReservedFields.Builder> internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable;
     internal static pbd::MessageDescriptor internal__static_protobuf_unittest_TestAllExtensions__Descriptor;
     internal static pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestAllExtensions, global::Google.ProtocolBuffers.TestProtos.TestAllExtensions.Builder> internal__static_protobuf_unittest_TestAllExtensions__FieldAccessorTable;
     internal static pbd::MessageDescriptor internal__static_protobuf_unittest_OptionalGroup_extension__Descriptor;
@@ -565,426 +567,429 @@ namespace Google.ProtocolBuffers.TestProtos {
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-            "ZW51bV9leHRlbnNpb24SKS5wcm90b2J1Zl91bml0dGVzdC5UZXN0VW5wYWNr", 
-            "ZWRFeHRlbnNpb25zGGcgAygOMh4ucHJvdG9idWZfdW5pdHRlc3QuRm9yZWln", 
-            "bkVudW1CAhAAQkFCDVVuaXR0ZXN0UHJvdG9IAYABAYgBAZABAfgBAaoCIUdv", 
-          "b2dsZS5Qcm90b2NvbEJ1ZmZlcnMuVGVzdFByb3Rvcw=="));
+            "cxhmIAMoCEICEAA6bgoXdW5wYWNrZWRfZW51bV9leHRlbnNpb24SKS5wcm90", 
+            "b2J1Zl91bml0dGVzdC5UZXN0VW5wYWNrZWRFeHRlbnNpb25zGGcgAygOMh4u", 
+            "cHJvdG9idWZfdW5pdHRlc3QuRm9yZWlnbkVudW1CAhAAQkFCDVVuaXR0ZXN0", 
+            "UHJvdG9IAYABAYgBAZABAfgBAaoCIUdvb2dsZS5Qcm90b2NvbEJ1ZmZlcnMu", 
+          "VGVzdFByb3Rvcw=="));
       pbd::FileDescriptor.InternalDescriptorAssigner assigner = delegate(pbd::FileDescriptor root) {
         descriptor = root;
         internal__static_protobuf_unittest_TestAllTypes__Descriptor = Descriptor.MessageTypes[0];
         internal__static_protobuf_unittest_TestAllTypes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestAllTypes, global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Builder>(internal__static_protobuf_unittest_TestAllTypes__Descriptor,
-                new string[] { "OptionalInt32", "OptionalInt64", "OptionalUint32", "OptionalUint64", "OptionalSint32", "OptionalSint64", "OptionalFixed32", "OptionalFixed64", "OptionalSfixed32", "OptionalSfixed64", "OptionalFloat", "OptionalDouble", "OptionalBool", "OptionalString", "OptionalBytes", "OptionalGroup", "OptionalNestedMessage", "OptionalForeignMessage", "OptionalImportMessage", "OptionalNestedEnum", "OptionalForeignEnum", "OptionalImportEnum", "OptionalStringPiece", "OptionalCord", "OptionalPublicImportMessage", "OptionalLazyMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedGroup", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedImportMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedImportEnum", "RepeatedStringPiece", "RepeatedCord", "RepeatedLazyMessage", "DefaultInt32", "DefaultInt64", "DefaultUint32", "DefaultUint64", "DefaultSint32", "DefaultSint64", "DefaultFixed32", "DefaultFixed64", "DefaultSfixed32", "DefaultSfixed64", "DefaultFloat", "DefaultDouble", "DefaultBool", "DefaultString", "DefaultBytes", "DefaultNestedEnum", "DefaultForeignEnum", "DefaultImportEnum", "DefaultStringPiece", "DefaultCord", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes", });
+                new string[] { "OptionalInt32", "OptionalInt64", "OptionalUint32", "OptionalUint64", "OptionalSint32", "OptionalSint64", "OptionalFixed32", "OptionalFixed64", "OptionalSfixed32", "OptionalSfixed64", "OptionalFloat", "OptionalDouble", "OptionalBool", "OptionalString", "OptionalBytes", "OptionalGroup", "OptionalNestedMessage", "OptionalForeignMessage", "OptionalImportMessage", "OptionalNestedEnum", "OptionalForeignEnum", "OptionalImportEnum", "OptionalStringPiece", "OptionalCord", "OptionalPublicImportMessage", "OptionalLazyMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedGroup", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedImportMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedImportEnum", "RepeatedStringPiece", "RepeatedCord", "RepeatedLazyMessage", "DefaultInt32", "DefaultInt64", "DefaultUint32", "DefaultUint64", "DefaultSint32", "DefaultSint64", "DefaultFixed32", "DefaultFixed64", "DefaultSfixed32", "DefaultSfixed64", "DefaultFloat", "DefaultDouble", "DefaultBool", "DefaultString", "DefaultBytes", "DefaultNestedEnum", "DefaultForeignEnum", "DefaultImportEnum", "DefaultStringPiece", "DefaultCord", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes", "OneofField", });
         internal__static_protobuf_unittest_TestAllTypes_NestedMessage__Descriptor = internal__static_protobuf_unittest_TestAllTypes__Descriptor.NestedTypes[0];
         internal__static_protobuf_unittest_TestAllTypes_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestAllTypes_NestedMessage__Descriptor,
@@ -1000,7 +1005,7 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_NestedTestAllTypes__Descriptor = Descriptor.MessageTypes[1];
         internal__static_protobuf_unittest_NestedTestAllTypes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes, global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes.Builder>(internal__static_protobuf_unittest_NestedTestAllTypes__Descriptor,
-                new string[] { "Child", "Payload", });
+                new string[] { "Child", "Payload", "RepeatedChild", });
         internal__static_protobuf_unittest_TestDeprecatedFields__Descriptor = Descriptor.MessageTypes[2];
         internal__static_protobuf_unittest_TestDeprecatedFields__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDeprecatedFields, global::Google.ProtocolBuffers.TestProtos.TestDeprecatedFields.Builder>(internal__static_protobuf_unittest_TestDeprecatedFields__Descriptor,
@@ -1009,67 +1014,71 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_ForeignMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.ForeignMessage, global::Google.ProtocolBuffers.TestProtos.ForeignMessage.Builder>(internal__static_protobuf_unittest_ForeignMessage__Descriptor,
                 new string[] { "C", });
-        internal__static_protobuf_unittest_TestAllExtensions__Descriptor = Descriptor.MessageTypes[4];
+        internal__static_protobuf_unittest_TestReservedFields__Descriptor = Descriptor.MessageTypes[4];
+        internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable = 
+            new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestReservedFields, global::Google.ProtocolBuffers.TestProtos.TestReservedFields.Builder>(internal__static_protobuf_unittest_TestReservedFields__Descriptor,
+                new string[] { });
+        internal__static_protobuf_unittest_TestAllExtensions__Descriptor = Descriptor.MessageTypes[5];
         internal__static_protobuf_unittest_TestAllExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestAllExtensions, global::Google.ProtocolBuffers.TestProtos.TestAllExtensions.Builder>(internal__static_protobuf_unittest_TestAllExtensions__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_OptionalGroup_extension__Descriptor = Descriptor.MessageTypes[5];
+        internal__static_protobuf_unittest_OptionalGroup_extension__Descriptor = Descriptor.MessageTypes[6];
         internal__static_protobuf_unittest_OptionalGroup_extension__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.OptionalGroup_extension, global::Google.ProtocolBuffers.TestProtos.OptionalGroup_extension.Builder>(internal__static_protobuf_unittest_OptionalGroup_extension__Descriptor,
                 new string[] { "A", });
-        internal__static_protobuf_unittest_RepeatedGroup_extension__Descriptor = Descriptor.MessageTypes[6];
+        internal__static_protobuf_unittest_RepeatedGroup_extension__Descriptor = Descriptor.MessageTypes[7];
         internal__static_protobuf_unittest_RepeatedGroup_extension__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.RepeatedGroup_extension, global::Google.ProtocolBuffers.TestProtos.RepeatedGroup_extension.Builder>(internal__static_protobuf_unittest_RepeatedGroup_extension__Descriptor,
                 new string[] { "A", });
-        internal__static_protobuf_unittest_TestNestedExtension__Descriptor = Descriptor.MessageTypes[7];
+        internal__static_protobuf_unittest_TestNestedExtension__Descriptor = Descriptor.MessageTypes[8];
         internal__static_protobuf_unittest_TestNestedExtension__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestNestedExtension, global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.Builder>(internal__static_protobuf_unittest_TestNestedExtension__Descriptor,
                 new string[] { });
         global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.Test = pb::GeneratedSingleExtension<string>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.Descriptor.Extensions[0]);
         global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.NestedStringExtension = pb::GeneratedSingleExtension<string>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.Descriptor.Extensions[1]);
-        internal__static_protobuf_unittest_TestRequired__Descriptor = Descriptor.MessageTypes[8];
+        internal__static_protobuf_unittest_TestRequired__Descriptor = Descriptor.MessageTypes[9];
         internal__static_protobuf_unittest_TestRequired__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRequired, global::Google.ProtocolBuffers.TestProtos.TestRequired.Builder>(internal__static_protobuf_unittest_TestRequired__Descriptor,
                 new string[] { "A", "Dummy2", "B", "Dummy4", "Dummy5", "Dummy6", "Dummy7", "Dummy8", "Dummy9", "Dummy10", "Dummy11", "Dummy12", "Dummy13", "Dummy14", "Dummy15", "Dummy16", "Dummy17", "Dummy18", "Dummy19", "Dummy20", "Dummy21", "Dummy22", "Dummy23", "Dummy24", "Dummy25", "Dummy26", "Dummy27", "Dummy28", "Dummy29", "Dummy30", "Dummy31", "Dummy32", "C", });
         global::Google.ProtocolBuffers.TestProtos.TestRequired.Single = pb::GeneratedSingleExtension<global::Google.ProtocolBuffers.TestProtos.TestRequired>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestRequired.Descriptor.Extensions[0]);
         global::Google.ProtocolBuffers.TestProtos.TestRequired.Multi = pb::GeneratedRepeatExtension<global::Google.ProtocolBuffers.TestProtos.TestRequired>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestRequired.Descriptor.Extensions[1]);
-        internal__static_protobuf_unittest_TestRequiredForeign__Descriptor = Descriptor.MessageTypes[9];
+        internal__static_protobuf_unittest_TestRequiredForeign__Descriptor = Descriptor.MessageTypes[10];
         internal__static_protobuf_unittest_TestRequiredForeign__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRequiredForeign, global::Google.ProtocolBuffers.TestProtos.TestRequiredForeign.Builder>(internal__static_protobuf_unittest_TestRequiredForeign__Descriptor,
                 new string[] { "OptionalMessage", "RepeatedMessage", "Dummy", });
-        internal__static_protobuf_unittest_TestForeignNested__Descriptor = Descriptor.MessageTypes[10];
+        internal__static_protobuf_unittest_TestForeignNested__Descriptor = Descriptor.MessageTypes[11];
         internal__static_protobuf_unittest_TestForeignNested__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestForeignNested, global::Google.ProtocolBuffers.TestProtos.TestForeignNested.Builder>(internal__static_protobuf_unittest_TestForeignNested__Descriptor,
                 new string[] { "ForeignNested", });
-        internal__static_protobuf_unittest_TestEmptyMessage__Descriptor = Descriptor.MessageTypes[11];
+        internal__static_protobuf_unittest_TestEmptyMessage__Descriptor = Descriptor.MessageTypes[12];
         internal__static_protobuf_unittest_TestEmptyMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestEmptyMessage, global::Google.ProtocolBuffers.TestProtos.TestEmptyMessage.Builder>(internal__static_protobuf_unittest_TestEmptyMessage__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestEmptyMessageWithExtensions__Descriptor = Descriptor.MessageTypes[12];
+        internal__static_protobuf_unittest_TestEmptyMessageWithExtensions__Descriptor = Descriptor.MessageTypes[13];
         internal__static_protobuf_unittest_TestEmptyMessageWithExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestEmptyMessageWithExtensions, global::Google.ProtocolBuffers.TestProtos.TestEmptyMessageWithExtensions.Builder>(internal__static_protobuf_unittest_TestEmptyMessageWithExtensions__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestMultipleExtensionRanges__Descriptor = Descriptor.MessageTypes[13];
+        internal__static_protobuf_unittest_TestMultipleExtensionRanges__Descriptor = Descriptor.MessageTypes[14];
         internal__static_protobuf_unittest_TestMultipleExtensionRanges__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestMultipleExtensionRanges, global::Google.ProtocolBuffers.TestProtos.TestMultipleExtensionRanges.Builder>(internal__static_protobuf_unittest_TestMultipleExtensionRanges__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestReallyLargeTagNumber__Descriptor = Descriptor.MessageTypes[14];
+        internal__static_protobuf_unittest_TestReallyLargeTagNumber__Descriptor = Descriptor.MessageTypes[15];
         internal__static_protobuf_unittest_TestReallyLargeTagNumber__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestReallyLargeTagNumber, global::Google.ProtocolBuffers.TestProtos.TestReallyLargeTagNumber.Builder>(internal__static_protobuf_unittest_TestReallyLargeTagNumber__Descriptor,
                 new string[] { "A", "Bb", });
-        internal__static_protobuf_unittest_TestRecursiveMessage__Descriptor = Descriptor.MessageTypes[15];
+        internal__static_protobuf_unittest_TestRecursiveMessage__Descriptor = Descriptor.MessageTypes[16];
         internal__static_protobuf_unittest_TestRecursiveMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRecursiveMessage, global::Google.ProtocolBuffers.TestProtos.TestRecursiveMessage.Builder>(internal__static_protobuf_unittest_TestRecursiveMessage__Descriptor,
                 new string[] { "A", "I", });
-        internal__static_protobuf_unittest_TestMutualRecursionA__Descriptor = Descriptor.MessageTypes[16];
+        internal__static_protobuf_unittest_TestMutualRecursionA__Descriptor = Descriptor.MessageTypes[17];
         internal__static_protobuf_unittest_TestMutualRecursionA__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestMutualRecursionA, global::Google.ProtocolBuffers.TestProtos.TestMutualRecursionA.Builder>(internal__static_protobuf_unittest_TestMutualRecursionA__Descriptor,
                 new string[] { "Bb", });
-        internal__static_protobuf_unittest_TestMutualRecursionB__Descriptor = Descriptor.MessageTypes[17];
+        internal__static_protobuf_unittest_TestMutualRecursionB__Descriptor = Descriptor.MessageTypes[18];
         internal__static_protobuf_unittest_TestMutualRecursionB__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestMutualRecursionB, global::Google.ProtocolBuffers.TestProtos.TestMutualRecursionB.Builder>(internal__static_protobuf_unittest_TestMutualRecursionB__Descriptor,
                 new string[] { "A", "OptionalInt32", });
-        internal__static_protobuf_unittest_TestDupFieldNumber__Descriptor = Descriptor.MessageTypes[18];
+        internal__static_protobuf_unittest_TestDupFieldNumber__Descriptor = Descriptor.MessageTypes[19];
         internal__static_protobuf_unittest_TestDupFieldNumber__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDupFieldNumber, global::Google.ProtocolBuffers.TestProtos.TestDupFieldNumber.Builder>(internal__static_protobuf_unittest_TestDupFieldNumber__Descriptor,
                 new string[] { "A", "Foo", "Bar", });
@@ -1081,15 +1090,15 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestDupFieldNumber_Bar__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDupFieldNumber.Types.Bar, global::Google.ProtocolBuffers.TestProtos.TestDupFieldNumber.Types.Bar.Builder>(internal__static_protobuf_unittest_TestDupFieldNumber_Bar__Descriptor,
                 new string[] { "A", });
-        internal__static_protobuf_unittest_TestEagerMessage__Descriptor = Descriptor.MessageTypes[19];
+        internal__static_protobuf_unittest_TestEagerMessage__Descriptor = Descriptor.MessageTypes[20];
         internal__static_protobuf_unittest_TestEagerMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestEagerMessage, global::Google.ProtocolBuffers.TestProtos.TestEagerMessage.Builder>(internal__static_protobuf_unittest_TestEagerMessage__Descriptor,
                 new string[] { "SubMessage", });
-        internal__static_protobuf_unittest_TestLazyMessage__Descriptor = Descriptor.MessageTypes[20];
+        internal__static_protobuf_unittest_TestLazyMessage__Descriptor = Descriptor.MessageTypes[21];
         internal__static_protobuf_unittest_TestLazyMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestLazyMessage, global::Google.ProtocolBuffers.TestProtos.TestLazyMessage.Builder>(internal__static_protobuf_unittest_TestLazyMessage__Descriptor,
                 new string[] { "SubMessage", });
-        internal__static_protobuf_unittest_TestNestedMessageHasBits__Descriptor = Descriptor.MessageTypes[21];
+        internal__static_protobuf_unittest_TestNestedMessageHasBits__Descriptor = Descriptor.MessageTypes[22];
         internal__static_protobuf_unittest_TestNestedMessageHasBits__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestNestedMessageHasBits, global::Google.ProtocolBuffers.TestProtos.TestNestedMessageHasBits.Builder>(internal__static_protobuf_unittest_TestNestedMessageHasBits__Descriptor,
                 new string[] { "OptionalNestedMessage", });
@@ -1097,11 +1106,11 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestNestedMessageHasBits_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestNestedMessageHasBits.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestNestedMessageHasBits.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestNestedMessageHasBits_NestedMessage__Descriptor,
                 new string[] { "NestedmessageRepeatedInt32", "NestedmessageRepeatedForeignmessage", });
-        internal__static_protobuf_unittest_TestCamelCaseFieldNames__Descriptor = Descriptor.MessageTypes[22];
+        internal__static_protobuf_unittest_TestCamelCaseFieldNames__Descriptor = Descriptor.MessageTypes[23];
         internal__static_protobuf_unittest_TestCamelCaseFieldNames__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestCamelCaseFieldNames, global::Google.ProtocolBuffers.TestProtos.TestCamelCaseFieldNames.Builder>(internal__static_protobuf_unittest_TestCamelCaseFieldNames__Descriptor,
                 new string[] { "PrimitiveField", "StringField", "EnumField", "MessageField", "StringPieceField", "CordField", "RepeatedPrimitiveField", "RepeatedStringField", "RepeatedEnumField", "RepeatedMessageField", "RepeatedStringPieceField", "RepeatedCordField", });
-        internal__static_protobuf_unittest_TestFieldOrderings__Descriptor = Descriptor.MessageTypes[23];
+        internal__static_protobuf_unittest_TestFieldOrderings__Descriptor = Descriptor.MessageTypes[24];
         internal__static_protobuf_unittest_TestFieldOrderings__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestFieldOrderings, global::Google.ProtocolBuffers.TestProtos.TestFieldOrderings.Builder>(internal__static_protobuf_unittest_TestFieldOrderings__Descriptor,
                 new string[] { "MyString", "MyInt", "MyFloat", "OptionalNestedMessage", });
@@ -1109,59 +1118,59 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestFieldOrderings_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestFieldOrderings.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestFieldOrderings.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestFieldOrderings_NestedMessage__Descriptor,
                 new string[] { "Oo", "Bb", });
-        internal__static_protobuf_unittest_TestExtremeDefaultValues__Descriptor = Descriptor.MessageTypes[24];
+        internal__static_protobuf_unittest_TestExtremeDefaultValues__Descriptor = Descriptor.MessageTypes[25];
         internal__static_protobuf_unittest_TestExtremeDefaultValues__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestExtremeDefaultValues, global::Google.ProtocolBuffers.TestProtos.TestExtremeDefaultValues.Builder>(internal__static_protobuf_unittest_TestExtremeDefaultValues__Descriptor,
                 new string[] { "EscapedBytes", "LargeUint32", "LargeUint64", "SmallInt32", "SmallInt64", "ReallySmallInt32", "ReallySmallInt64", "Utf8String", "ZeroFloat", "OneFloat", "SmallFloat", "NegativeOneFloat", "NegativeFloat", "LargeFloat", "SmallNegativeFloat", "InfDouble", "NegInfDouble", "NanDouble", "InfFloat", "NegInfFloat", "NanFloat", "CppTrigraph", "StringWithZero", "BytesWithZero", "StringPieceWithZero", "CordWithZero", "ReplacementString", });
-        internal__static_protobuf_unittest_SparseEnumMessage__Descriptor = Descriptor.MessageTypes[25];
+        internal__static_protobuf_unittest_SparseEnumMessage__Descriptor = Descriptor.MessageTypes[26];
         internal__static_protobuf_unittest_SparseEnumMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.SparseEnumMessage, global::Google.ProtocolBuffers.TestProtos.SparseEnumMessage.Builder>(internal__static_protobuf_unittest_SparseEnumMessage__Descriptor,
                 new string[] { "SparseEnum", });
-        internal__static_protobuf_unittest_OneString__Descriptor = Descriptor.MessageTypes[26];
+        internal__static_protobuf_unittest_OneString__Descriptor = Descriptor.MessageTypes[27];
         internal__static_protobuf_unittest_OneString__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.OneString, global::Google.ProtocolBuffers.TestProtos.OneString.Builder>(internal__static_protobuf_unittest_OneString__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_MoreString__Descriptor = Descriptor.MessageTypes[27];
+        internal__static_protobuf_unittest_MoreString__Descriptor = Descriptor.MessageTypes[28];
         internal__static_protobuf_unittest_MoreString__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.MoreString, global::Google.ProtocolBuffers.TestProtos.MoreString.Builder>(internal__static_protobuf_unittest_MoreString__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_OneBytes__Descriptor = Descriptor.MessageTypes[28];
+        internal__static_protobuf_unittest_OneBytes__Descriptor = Descriptor.MessageTypes[29];
         internal__static_protobuf_unittest_OneBytes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.OneBytes, global::Google.ProtocolBuffers.TestProtos.OneBytes.Builder>(internal__static_protobuf_unittest_OneBytes__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_MoreBytes__Descriptor = Descriptor.MessageTypes[29];
+        internal__static_protobuf_unittest_MoreBytes__Descriptor = Descriptor.MessageTypes[30];
         internal__static_protobuf_unittest_MoreBytes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.MoreBytes, global::Google.ProtocolBuffers.TestProtos.MoreBytes.Builder>(internal__static_protobuf_unittest_MoreBytes__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_Int32Message__Descriptor = Descriptor.MessageTypes[30];
+        internal__static_protobuf_unittest_Int32Message__Descriptor = Descriptor.MessageTypes[31];
         internal__static_protobuf_unittest_Int32Message__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Int32Message, global::Google.ProtocolBuffers.TestProtos.Int32Message.Builder>(internal__static_protobuf_unittest_Int32Message__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_Uint32Message__Descriptor = Descriptor.MessageTypes[31];
+        internal__static_protobuf_unittest_Uint32Message__Descriptor = Descriptor.MessageTypes[32];
         internal__static_protobuf_unittest_Uint32Message__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Uint32Message, global::Google.ProtocolBuffers.TestProtos.Uint32Message.Builder>(internal__static_protobuf_unittest_Uint32Message__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_Int64Message__Descriptor = Descriptor.MessageTypes[32];
+        internal__static_protobuf_unittest_Int64Message__Descriptor = Descriptor.MessageTypes[33];
         internal__static_protobuf_unittest_Int64Message__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Int64Message, global::Google.ProtocolBuffers.TestProtos.Int64Message.Builder>(internal__static_protobuf_unittest_Int64Message__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_Uint64Message__Descriptor = Descriptor.MessageTypes[33];
+        internal__static_protobuf_unittest_Uint64Message__Descriptor = Descriptor.MessageTypes[34];
         internal__static_protobuf_unittest_Uint64Message__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Uint64Message, global::Google.ProtocolBuffers.TestProtos.Uint64Message.Builder>(internal__static_protobuf_unittest_Uint64Message__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_BoolMessage__Descriptor = Descriptor.MessageTypes[34];
+        internal__static_protobuf_unittest_BoolMessage__Descriptor = Descriptor.MessageTypes[35];
         internal__static_protobuf_unittest_BoolMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.BoolMessage, global::Google.ProtocolBuffers.TestProtos.BoolMessage.Builder>(internal__static_protobuf_unittest_BoolMessage__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_TestOneof__Descriptor = Descriptor.MessageTypes[35];
+        internal__static_protobuf_unittest_TestOneof__Descriptor = Descriptor.MessageTypes[36];
         internal__static_protobuf_unittest_TestOneof__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof, global::Google.ProtocolBuffers.TestProtos.TestOneof.Builder>(internal__static_protobuf_unittest_TestOneof__Descriptor,
-                new string[] { "FooInt", "FooString", "FooMessage", "FooGroup", });
+                new string[] { "FooInt", "FooString", "FooMessage", "FooGroup", "Foo", });
         internal__static_protobuf_unittest_TestOneof_FooGroup__Descriptor = internal__static_protobuf_unittest_TestOneof__Descriptor.NestedTypes[0];
         internal__static_protobuf_unittest_TestOneof_FooGroup__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup, global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.Builder>(internal__static_protobuf_unittest_TestOneof_FooGroup__Descriptor,
                 new string[] { "A", "B", });
-        internal__static_protobuf_unittest_TestOneofBackwardsCompatible__Descriptor = Descriptor.MessageTypes[36];
+        internal__static_protobuf_unittest_TestOneofBackwardsCompatible__Descriptor = Descriptor.MessageTypes[37];
         internal__static_protobuf_unittest_TestOneofBackwardsCompatible__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneofBackwardsCompatible, global::Google.ProtocolBuffers.TestProtos.TestOneofBackwardsCompatible.Builder>(internal__static_protobuf_unittest_TestOneofBackwardsCompatible__Descriptor,
                 new string[] { "FooInt", "FooString", "FooMessage", "FooGroup", });
@@ -1169,10 +1178,10 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestOneofBackwardsCompatible_FooGroup__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneofBackwardsCompatible.Types.FooGroup, global::Google.ProtocolBuffers.TestProtos.TestOneofBackwardsCompatible.Types.FooGroup.Builder>(internal__static_protobuf_unittest_TestOneofBackwardsCompatible_FooGroup__Descriptor,
                 new string[] { "A", "B", });
-        internal__static_protobuf_unittest_TestOneof2__Descriptor = Descriptor.MessageTypes[37];
+        internal__static_protobuf_unittest_TestOneof2__Descriptor = Descriptor.MessageTypes[38];
         internal__static_protobuf_unittest_TestOneof2__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof2, global::Google.ProtocolBuffers.TestProtos.TestOneof2.Builder>(internal__static_protobuf_unittest_TestOneof2__Descriptor,
-                new string[] { "FooInt", "FooString", "FooCord", "FooStringPiece", "FooBytes", "FooEnum", "FooMessage", "FooGroup", "FooLazyMessage", "BarInt", "BarString", "BarCord", "BarStringPiece", "BarBytes", "BarEnum", "BazInt", "BazString", });
+                new string[] { "FooInt", "FooString", "FooCord", "FooStringPiece", "FooBytes", "FooEnum", "FooMessage", "FooGroup", "FooLazyMessage", "BarInt", "BarString", "BarCord", "BarStringPiece", "BarBytes", "BarEnum", "BazInt", "BazString", "Foo", "Bar", });
         internal__static_protobuf_unittest_TestOneof2_FooGroup__Descriptor = internal__static_protobuf_unittest_TestOneof2__Descriptor.NestedTypes[0];
         internal__static_protobuf_unittest_TestOneof2_FooGroup__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup, global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.Builder>(internal__static_protobuf_unittest_TestOneof2_FooGroup__Descriptor,
@@ -1181,31 +1190,31 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestOneof2_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestOneof2_NestedMessage__Descriptor,
                 new string[] { "QuxInt", "CorgeInt", });
-        internal__static_protobuf_unittest_TestRequiredOneof__Descriptor = Descriptor.MessageTypes[38];
+        internal__static_protobuf_unittest_TestRequiredOneof__Descriptor = Descriptor.MessageTypes[39];
         internal__static_protobuf_unittest_TestRequiredOneof__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof, global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Builder>(internal__static_protobuf_unittest_TestRequiredOneof__Descriptor,
-                new string[] { "FooInt", "FooString", "FooMessage", });
+                new string[] { "FooInt", "FooString", "FooMessage", "Foo", });
         internal__static_protobuf_unittest_TestRequiredOneof_NestedMessage__Descriptor = internal__static_protobuf_unittest_TestRequiredOneof__Descriptor.NestedTypes[0];
         internal__static_protobuf_unittest_TestRequiredOneof_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestRequiredOneof_NestedMessage__Descriptor,
                 new string[] { "RequiredDouble", });
-        internal__static_protobuf_unittest_TestPackedTypes__Descriptor = Descriptor.MessageTypes[39];
+        internal__static_protobuf_unittest_TestPackedTypes__Descriptor = Descriptor.MessageTypes[40];
         internal__static_protobuf_unittest_TestPackedTypes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestPackedTypes, global::Google.ProtocolBuffers.TestProtos.TestPackedTypes.Builder>(internal__static_protobuf_unittest_TestPackedTypes__Descriptor,
                 new string[] { "PackedInt32", "PackedInt64", "PackedUint32", "PackedUint64", "PackedSint32", "PackedSint64", "PackedFixed32", "PackedFixed64", "PackedSfixed32", "PackedSfixed64", "PackedFloat", "PackedDouble", "PackedBool", "PackedEnum", });
-        internal__static_protobuf_unittest_TestUnpackedTypes__Descriptor = Descriptor.MessageTypes[40];
+        internal__static_protobuf_unittest_TestUnpackedTypes__Descriptor = Descriptor.MessageTypes[41];
         internal__static_protobuf_unittest_TestUnpackedTypes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestUnpackedTypes, global::Google.ProtocolBuffers.TestProtos.TestUnpackedTypes.Builder>(internal__static_protobuf_unittest_TestUnpackedTypes__Descriptor,
                 new string[] { "UnpackedInt32", "UnpackedInt64", "UnpackedUint32", "UnpackedUint64", "UnpackedSint32", "UnpackedSint64", "UnpackedFixed32", "UnpackedFixed64", "UnpackedSfixed32", "UnpackedSfixed64", "UnpackedFloat", "UnpackedDouble", "UnpackedBool", "UnpackedEnum", });
-        internal__static_protobuf_unittest_TestPackedExtensions__Descriptor = Descriptor.MessageTypes[41];
+        internal__static_protobuf_unittest_TestPackedExtensions__Descriptor = Descriptor.MessageTypes[42];
         internal__static_protobuf_unittest_TestPackedExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestPackedExtensions, global::Google.ProtocolBuffers.TestProtos.TestPackedExtensions.Builder>(internal__static_protobuf_unittest_TestPackedExtensions__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestUnpackedExtensions__Descriptor = Descriptor.MessageTypes[42];
+        internal__static_protobuf_unittest_TestUnpackedExtensions__Descriptor = Descriptor.MessageTypes[43];
         internal__static_protobuf_unittest_TestUnpackedExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestUnpackedExtensions, global::Google.ProtocolBuffers.TestProtos.TestUnpackedExtensions.Builder>(internal__static_protobuf_unittest_TestUnpackedExtensions__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestDynamicExtensions__Descriptor = Descriptor.MessageTypes[43];
+        internal__static_protobuf_unittest_TestDynamicExtensions__Descriptor = Descriptor.MessageTypes[44];
         internal__static_protobuf_unittest_TestDynamicExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDynamicExtensions, global::Google.ProtocolBuffers.TestProtos.TestDynamicExtensions.Builder>(internal__static_protobuf_unittest_TestDynamicExtensions__Descriptor,
                 new string[] { "ScalarExtension", "EnumExtension", "DynamicEnumExtension", "MessageExtension", "DynamicMessageExtension", "RepeatedExtension", "PackedExtension", });
@@ -1213,11 +1222,11 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestDynamicExtensions_DynamicMessageType__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDynamicExtensions.Types.DynamicMessageType, global::Google.ProtocolBuffers.TestProtos.TestDynamicExtensions.Types.DynamicMessageType.Builder>(internal__static_protobuf_unittest_TestDynamicExtensions_DynamicMessageType__Descriptor,
                 new string[] { "DynamicField", });
-        internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__Descriptor = Descriptor.MessageTypes[44];
+        internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__Descriptor = Descriptor.MessageTypes[45];
         internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRepeatedScalarDifferentTagSizes, global::Google.ProtocolBuffers.TestProtos.TestRepeatedScalarDifferentTagSizes.Builder>(internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__Descriptor,
                 new string[] { "RepeatedFixed32", "RepeatedInt32", "RepeatedFixed64", "RepeatedInt64", "RepeatedFloat", "RepeatedUint64", });
-        internal__static_protobuf_unittest_TestParsingMerge__Descriptor = Descriptor.MessageTypes[45];
+        internal__static_protobuf_unittest_TestParsingMerge__Descriptor = Descriptor.MessageTypes[46];
         internal__static_protobuf_unittest_TestParsingMerge__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestParsingMerge, global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.Builder>(internal__static_protobuf_unittest_TestParsingMerge__Descriptor,
                 new string[] { "RequiredAllTypes", "OptionalAllTypes", "RepeatedAllTypes", "OptionalGroup", "RepeatedGroup", });
@@ -1243,31 +1252,31 @@ namespace Google.ProtocolBuffers.TestProtos {
                 new string[] { "RepeatedGroupAllTypes", });
         global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.OptionalExt = pb::GeneratedSingleExtension<global::Google.ProtocolBuffers.TestProtos.TestAllTypes>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.Descriptor.Extensions[0]);
         global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.RepeatedExt = pb::GeneratedRepeatExtension<global::Google.ProtocolBuffers.TestProtos.TestAllTypes>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.Descriptor.Extensions[1]);
-        internal__static_protobuf_unittest_TestCommentInjectionMessage__Descriptor = Descriptor.MessageTypes[46];
+        internal__static_protobuf_unittest_TestCommentInjectionMessage__Descriptor = Descriptor.MessageTypes[47];
         internal__static_protobuf_unittest_TestCommentInjectionMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestCommentInjectionMessage, global::Google.ProtocolBuffers.TestProtos.TestCommentInjectionMessage.Builder>(internal__static_protobuf_unittest_TestCommentInjectionMessage__Descriptor,
                 new string[] { "A", });
-        internal__static_protobuf_unittest_FooRequest__Descriptor = Descriptor.MessageTypes[47];
+        internal__static_protobuf_unittest_FooRequest__Descriptor = Descriptor.MessageTypes[48];
         internal__static_protobuf_unittest_FooRequest__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.FooRequest, global::Google.ProtocolBuffers.TestProtos.FooRequest.Builder>(internal__static_protobuf_unittest_FooRequest__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_FooResponse__Descriptor = Descriptor.MessageTypes[48];
+        internal__static_protobuf_unittest_FooResponse__Descriptor = Descriptor.MessageTypes[49];
         internal__static_protobuf_unittest_FooResponse__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.FooResponse, global::Google.ProtocolBuffers.TestProtos.FooResponse.Builder>(internal__static_protobuf_unittest_FooResponse__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_FooClientMessage__Descriptor = Descriptor.MessageTypes[49];
+        internal__static_protobuf_unittest_FooClientMessage__Descriptor = Descriptor.MessageTypes[50];
         internal__static_protobuf_unittest_FooClientMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.FooClientMessage, global::Google.ProtocolBuffers.TestProtos.FooClientMessage.Builder>(internal__static_protobuf_unittest_FooClientMessage__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_FooServerMessage__Descriptor = Descriptor.MessageTypes[50];
+        internal__static_protobuf_unittest_FooServerMessage__Descriptor = Descriptor.MessageTypes[51];
         internal__static_protobuf_unittest_FooServerMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.FooServerMessage, global::Google.ProtocolBuffers.TestProtos.FooServerMessage.Builder>(internal__static_protobuf_unittest_FooServerMessage__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_BarRequest__Descriptor = Descriptor.MessageTypes[51];
+        internal__static_protobuf_unittest_BarRequest__Descriptor = Descriptor.MessageTypes[52];
         internal__static_protobuf_unittest_BarRequest__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.BarRequest, global::Google.ProtocolBuffers.TestProtos.BarRequest.Builder>(internal__static_protobuf_unittest_BarRequest__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_BarResponse__Descriptor = Descriptor.MessageTypes[52];
+        internal__static_protobuf_unittest_BarResponse__Descriptor = Descriptor.MessageTypes[53];
         internal__static_protobuf_unittest_BarResponse__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.BarResponse, global::Google.ProtocolBuffers.TestProtos.BarResponse.Builder>(internal__static_protobuf_unittest_BarResponse__Descriptor,
                 new string[] { });
@@ -2281,6 +2290,19 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
     #endregion
 
+    private object oneofField_;
+    public enum OneofFieldOneofCase {
+      OneofUint32 = 111,
+      OneofNestedMessage = 112,
+      OneofString = 113,
+      OneofBytes = 114,
+      None = 0,
+    }
+    private OneofFieldOneofCase oneofFieldCase_ = OneofFieldOneofCase.None;
+    public OneofFieldOneofCase OneofFieldCase {
+      get { return oneofFieldCase_; }
+    }
+
     public const int OptionalInt32FieldNumber = 1;
     private bool hasOptionalInt32;
     private int optionalInt32_;
@@ -3042,43 +3064,35 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
 
     public const int OneofUint32FieldNumber = 111;
-    private bool hasOneofUint32;
-    private uint oneofUint32_;
     public bool HasOneofUint32 {
-      get { return hasOneofUint32; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofUint32; }
     }
     public uint OneofUint32 {
-      get { return oneofUint32_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofUint32 ? (uint) oneofField_ : 0; }
     }
 
     public const int OneofNestedMessageFieldNumber = 112;
-    private bool hasOneofNestedMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage oneofNestedMessage_;
     public bool HasOneofNestedMessage {
-      get { return hasOneofNestedMessage; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage OneofNestedMessage {
-      get { return oneofNestedMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage) oneofField_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance; }
     }
 
     public const int OneofStringFieldNumber = 113;
-    private bool hasOneofString;
-    private string oneofString_ = "";
     public bool HasOneofString {
-      get { return hasOneofString; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofString; }
     }
     public string OneofString {
-      get { return oneofString_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofString ? (string) oneofField_ : ""; }
     }
 
     public const int OneofBytesFieldNumber = 114;
-    private bool hasOneofBytes;
-    private pb::ByteString oneofBytes_ = pb::ByteString.Empty;
     public bool HasOneofBytes {
-      get { return hasOneofBytes; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofBytes; }
     }
     public pb::ByteString OneofBytes {
-      get { return oneofBytes_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofBytes ? (pb::ByteString) oneofField_ : pb::ByteString.Empty; }
     }
 
     public override bool IsInitialized {
@@ -3303,16 +3317,16 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasDefaultCord) {
         output.WriteString(85, field_names[2], DefaultCord);
       }
-      if (hasOneofUint32) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
         output.WriteUInt32(111, field_names[23], OneofUint32);
       }
-      if (hasOneofNestedMessage) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
         output.WriteMessage(112, field_names[21], OneofNestedMessage);
       }
-      if (hasOneofString) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
         output.WriteString(113, field_names[22], OneofString);
       }
-      if (hasOneofBytes) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
         output.WriteBytes(114, field_names[20], OneofBytes);
       }
       UnknownFields.WriteTo(output);
@@ -3637,16 +3651,16 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasDefaultCord) {
         size += pb::CodedOutputStream.ComputeStringSize(85, DefaultCord);
       }
-      if (hasOneofUint32) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
         size += pb::CodedOutputStream.ComputeUInt32Size(111, OneofUint32);
       }
-      if (hasOneofNestedMessage) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(112, OneofNestedMessage);
       }
-      if (hasOneofString) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
         size += pb::CodedOutputStream.ComputeStringSize(113, OneofString);
       }
-      if (hasOneofBytes) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
         size += pb::CodedOutputStream.ComputeBytesSize(114, OneofBytes);
       }
       size += UnknownFields.SerializedSize;
@@ -4009,17 +4023,24 @@ namespace Google.ProtocolBuffers.TestProtos {
         if (other.HasDefaultCord) {
           DefaultCord = other.DefaultCord;
         }
-        if (other.HasOneofUint32) {
-          OneofUint32 = other.OneofUint32;
-        }
-        if (other.HasOneofNestedMessage) {
-          MergeOneofNestedMessage(other.OneofNestedMessage);
-        }
-        if (other.HasOneofString) {
-          OneofString = other.OneofString;
-        }
-        if (other.HasOneofBytes) {
-          OneofBytes = other.OneofBytes;
+        switch (other.OneofFieldCase) {
+          case OneofFieldOneofCase.OneofUint32: {
+            SetOneofUint32(other.OneofUint32);
+            break;
+          }
+          case OneofFieldOneofCase.OneofNestedMessage: {
+            MergeOneofNestedMessage(other.OneofNestedMessage);
+            break;
+          }
+          case OneofFieldOneofCase.OneofString: {
+            SetOneofString(other.OneofString);
+            break;
+          }
+          case OneofFieldOneofCase.OneofBytes: {
+            SetOneofBytes(other.OneofBytes);
+            break;
+          }
+          case OneofFieldOneofCase.None: { break; }
         }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
@@ -4470,24 +4491,37 @@ namespace Google.ProtocolBuffers.TestProtos {
               break;
             }
             case 888: {
-              result.hasOneofUint32 = input.ReadUInt32(ref result.oneofUint32_);
+              uint value = 0;
+              if (input.ReadUInt32(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofUint32;
+              }
               break;
             }
             case 898: {
               global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.CreateBuilder();
-              if (result.hasOneofNestedMessage) {
+              if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
                 subBuilder.MergeFrom(OneofNestedMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              OneofNestedMessage = subBuilder.BuildPartial();
+              result.oneofField_ = subBuilder.BuildPartial();
+              result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
               break;
             }
             case 906: {
-              result.hasOneofString = input.ReadString(ref result.oneofString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofString;
+              }
               break;
             }
             case 914: {
-              result.hasOneofBytes = input.ReadBytes(ref result.oneofBytes_);
+              pb::ByteString value = pb::ByteString.Empty;
+              if (input.ReadBytes(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofBytes;
+              }
               break;
             }
           }
@@ -6377,104 +6411,119 @@ namespace Google.ProtocolBuffers.TestProtos {
       }
 
       public bool HasOneofUint32 {
-        get { return result.hasOneofUint32; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32; }
       }
       public uint OneofUint32 {
-        get { return result.OneofUint32; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32 ? (uint) result.oneofField_ : 0; }
         set { SetOneofUint32(value); }
       }
       public Builder SetOneofUint32(uint value) {
         PrepareBuilder();
-        result.hasOneofUint32 = true;
-        result.oneofUint32_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofUint32;
         return this;
       }
       public Builder ClearOneofUint32() {
         PrepareBuilder();
-        result.hasOneofUint32 = false;
-        result.oneofUint32_ = 0;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
         return this;
       }
 
       public bool HasOneofNestedMessage {
-       get { return result.hasOneofNestedMessage; }
+       get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage OneofNestedMessage {
-        get { return result.OneofNestedMessage; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage) result.oneofField_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance; }
         set { SetOneofNestedMessage(value); }
       }
       public Builder SetOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofNestedMessage = true;
-        result.oneofNestedMessage_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
+        result.oneofField_ = value;
         return this;
       }
       public Builder SetOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasOneofNestedMessage = true;
-        result.oneofNestedMessage_ = builderForValue.Build();
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
+        result.oneofField_ = builderForValue.Build();
         return this;
       }
       public Builder MergeOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasOneofNestedMessage &&
-            result.oneofNestedMessage_ != global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance) {
-            result.oneofNestedMessage_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.CreateBuilder(result.oneofNestedMessage_).MergeFrom(value).BuildPartial();
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage &&
+            result.OneofNestedMessage != global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance) {
+          result.oneofField_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.CreateBuilder(result.OneofNestedMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.oneofNestedMessage_ = value;
+          result.oneofField_ = value;
         }
-        result.hasOneofNestedMessage = true;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
         return this;
       }
       public Builder ClearOneofNestedMessage() {
-        PrepareBuilder();
-        result.hasOneofNestedMessage = false;
-        result.oneofNestedMessage_ = null;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
+          PrepareBuilder();
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+          result.oneofField_ = null;
+        }
         return this;
       }
 
       public bool HasOneofString {
-        get { return result.hasOneofString; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofString; }
       }
       public string OneofString {
-        get { return result.OneofString; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofString ? (string) result.oneofField_ : ""; }
         set { SetOneofString(value); }
       }
       public Builder SetOneofString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofString = true;
-        result.oneofString_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofString;
         return this;
       }
       public Builder ClearOneofString() {
         PrepareBuilder();
-        result.hasOneofString = false;
-        result.oneofString_ = "";
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
         return this;
       }
 
       public bool HasOneofBytes {
-        get { return result.hasOneofBytes; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofBytes; }
       }
       public pb::ByteString OneofBytes {
-        get { return result.OneofBytes; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofBytes ? (pb::ByteString) result.oneofField_ : pb::ByteString.Empty; }
         set { SetOneofBytes(value); }
       }
       public Builder SetOneofBytes(pb::ByteString value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofBytes = true;
-        result.oneofBytes_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofBytes;
         return this;
       }
       public Builder ClearOneofBytes() {
         PrepareBuilder();
-        result.hasOneofBytes = false;
-        result.oneofBytes_ = pb::ByteString.Empty;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
+        return this;
+      }
+
+      public OneofFieldOneofCase OneofFieldCase {
+        get { return result.oneofFieldCase_; }
+      }
+      public Builder ClearOneofField() {
+        PrepareBuilder();
+        result.oneofField_ = null;
+        result.oneofFieldCase_ = OneofFieldOneofCase.None;
         return this;
       }
     }
@@ -6487,8 +6536,8 @@ namespace Google.ProtocolBuffers.TestProtos {
   public sealed partial class NestedTestAllTypes : pb::GeneratedMessage<NestedTestAllTypes, NestedTestAllTypes.Builder> {
     private NestedTestAllTypes() { }
     private static readonly NestedTestAllTypes defaultInstance = new NestedTestAllTypes().MakeReadOnly();
-    private static readonly string[] _nestedTestAllTypesFieldNames = new string[] { "child", "payload" };
-    private static readonly uint[] _nestedTestAllTypesFieldTags = new uint[] { 10, 18 };
+    private static readonly string[] _nestedTestAllTypesFieldNames = new string[] { "child", "payload", "repeated_child" };
+    private static readonly uint[] _nestedTestAllTypesFieldTags = new uint[] { 10, 18, 26 };
     public static NestedTestAllTypes DefaultInstance {
       get { return defaultInstance; }
     }
@@ -6529,6 +6578,18 @@ namespace Google.ProtocolBuffers.TestProtos {
       get { return payload_ ?? global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance; }
     }
 
+    public const int RepeatedChildFieldNumber = 3;
+    private pbc::PopsicleList<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes> repeatedChild_ = new pbc::PopsicleList<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes>();
+    public scg::IList<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes> RepeatedChildList {
+      get { return repeatedChild_; }
+    }
+    public int RepeatedChildCount {
+      get { return repeatedChild_.Count; }
+    }
+    public global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes GetRepeatedChild(int index) {
+      return repeatedChild_[index];
+    }
+
     public override bool IsInitialized {
       get {
         return true;
@@ -6544,6 +6605,9 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasPayload) {
         output.WriteMessage(2, field_names[1], Payload);
       }
+      if (repeatedChild_.Count > 0) {
+        output.WriteMessageArray(3, field_names[2], repeatedChild_);
+      }
       UnknownFields.WriteTo(output);
     }
 
@@ -6567,6 +6631,9 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasPayload) {
         size += pb::CodedOutputStream.ComputeMessageSize(2, Payload);
       }
+      foreach (global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes element in RepeatedChildList) {
+        size += pb::CodedOutputStream.ComputeMessageSize(3, element);
+      }
       size += UnknownFields.SerializedSize;
       memoizedSerializedSize = size;
       return size;
@@ -6602,6 +6669,7 @@ namespace Google.ProtocolBuffers.TestProtos {
       return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
     }
     private NestedTestAllTypes MakeReadOnly() {
+      repeatedChild_.MakeReadOnly();
       return this;
     }
 
@@ -6695,6 +6763,9 @@ namespace Google.ProtocolBuffers.TestProtos {
         if (other.HasPayload) {
           MergePayload(other.Payload);
         }
+        if (other.repeatedChild_.Count != 0) {
+          result.repeatedChild_.Add(other.repeatedChild_);
+        }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
       }
@@ -6756,6 +6827,10 @@ namespace Google.ProtocolBuffers.TestProtos {
               Payload = subBuilder.BuildPartial();
               break;
             }
+            case 26: {
+              input.ReadMessageArray(tag, field_name, result.repeatedChild_, global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes.DefaultInstance, extensionRegistry);
+              break;
+            }
           }
         }
 
@@ -6845,6 +6920,50 @@ namespace Google.ProtocolBuffers.TestProtos {
         result.payload_ = null;
         return this;
       }
+
+      public pbc::IPopsicleList<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes> RepeatedChildList {
+        get { return PrepareBuilder().repeatedChild_; }
+      }
+      public int RepeatedChildCount {
+        get { return result.RepeatedChildCount; }
+      }
+      public global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes GetRepeatedChild(int index) {
+        return result.GetRepeatedChild(index);
+      }
+      public Builder SetRepeatedChild(int index, global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes value) {
+        pb::ThrowHelper.ThrowIfNull(value, "value");
+        PrepareBuilder();
+        result.repeatedChild_[index] = value;
+        return this;
+      }
+      public Builder SetRepeatedChild(int index, global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes.Builder builderForValue) {
+        pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
+        PrepareBuilder();
+        result.repeatedChild_[index] = builderForValue.Build();
+        return this;
+      }
+      public Builder AddRepeatedChild(global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes value) {
+        pb::ThrowHelper.ThrowIfNull(value, "value");
+        PrepareBuilder();
+        result.repeatedChild_.Add(value);
+        return this;
+      }
+      public Builder AddRepeatedChild(global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes.Builder builderForValue) {
+        pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
+        PrepareBuilder();
+        result.repeatedChild_.Add(builderForValue.Build());
+        return this;
+      }
+      public Builder AddRangeRepeatedChild(scg::IEnumerable<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes> values) {
+        PrepareBuilder();
+        result.repeatedChild_.Add(values);
+        return this;
+      }
+      public Builder ClearRepeatedChild() {
+        PrepareBuilder();
+        result.repeatedChild_.Clear();
+        return this;
+      }
     }
     static NestedTestAllTypes() {
       object.ReferenceEquals(global::Google.ProtocolBuffers.TestProtos.Unittest.Descriptor, null);
@@ -7408,6 +7527,238 @@ namespace Google.ProtocolBuffers.TestProtos {
   }
 
   [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  public sealed partial class TestReservedFields : pb::GeneratedMessage<TestReservedFields, TestReservedFields.Builder> {
+    private TestReservedFields() { }
+    private static readonly TestReservedFields defaultInstance = new TestReservedFields().MakeReadOnly();
+    private static readonly string[] _testReservedFieldsFieldNames = new string[] {  };
+    private static readonly uint[] _testReservedFieldsFieldTags = new uint[] {  };
+    public static TestReservedFields DefaultInstance {
+      get { return defaultInstance; }
+    }
+
+    public override TestReservedFields DefaultInstanceForType {
+      get { return DefaultInstance; }
+    }
+
+    protected override TestReservedFields ThisMessage {
+      get { return this; }
+    }
+
+    public static pbd::MessageDescriptor Descriptor {
+      get { return global::Google.ProtocolBuffers.TestProtos.Unittest.internal__static_protobuf_unittest_TestReservedFields__Descriptor; }
+    }
+
+    protected override pb::FieldAccess.FieldAccessorTable<TestReservedFields, TestReservedFields.Builder> InternalFieldAccessors {
+      get { return global::Google.ProtocolBuffers.TestProtos.Unittest.internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable; }
+    }
+
+    public override bool IsInitialized {
+      get {
+        return true;
+      }
+    }
+
+    public override void WriteTo(pb::ICodedOutputStream output) {
+      CalcSerializedSize();
+      string[] field_names = _testReservedFieldsFieldNames;
+      UnknownFields.WriteTo(output);
+    }
+
+    private int memoizedSerializedSize = -1;
+    public override int SerializedSize {
+      get {
+        int size = memoizedSerializedSize;
+        if (size != -1) return size;
+        return CalcSerializedSize();
+      }
+    }
+
+    private int CalcSerializedSize() {
+      int size = memoizedSerializedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      size += UnknownFields.SerializedSize;
+      memoizedSerializedSize = size;
+      return size;
+    }
+    public static TestReservedFields ParseFrom(pb::ByteString data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(pb::ByteString data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(byte[] data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(byte[] data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(global::System.IO.Stream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    public static TestReservedFields ParseDelimitedFrom(global::System.IO.Stream input) {
+      return CreateBuilder().MergeDelimitedFrom(input).BuildParsed();
+    }
+    public static TestReservedFields ParseDelimitedFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return CreateBuilder().MergeDelimitedFrom(input, extensionRegistry).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(pb::ICodedInputStream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    private TestReservedFields MakeReadOnly() {
+      return this;
+    }
+
+    public static Builder CreateBuilder() { return new Builder(); }
+    public override Builder ToBuilder() { return CreateBuilder(this); }
+    public override Builder CreateBuilderForType() { return new Builder(); }
+    public static Builder CreateBuilder(TestReservedFields prototype) {
+      return new Builder(prototype);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    public sealed partial class Builder : pb::GeneratedBuilder<TestReservedFields, Builder> {
+      protected override Builder ThisBuilder {
+        get { return this; }
+      }
+      public Builder() {
+        result = DefaultInstance;
+        resultIsReadOnly = true;
+      }
+      internal Builder(TestReservedFields cloneFrom) {
+        result = cloneFrom;
+        resultIsReadOnly = true;
+      }
+
+      private bool resultIsReadOnly;
+      private TestReservedFields result;
+
+      private TestReservedFields PrepareBuilder() {
+        if (resultIsReadOnly) {
+          TestReservedFields original = result;
+          result = new TestReservedFields();
+          resultIsReadOnly = false;
+          MergeFrom(original);
+        }
+        return result;
+      }
+
+      public override bool IsInitialized {
+        get { return result.IsInitialized; }
+      }
+
+      protected override TestReservedFields MessageBeingBuilt {
+        get { return PrepareBuilder(); }
+      }
+
+      public override Builder Clear() {
+        result = DefaultInstance;
+        resultIsReadOnly = true;
+        return this;
+      }
+
+      public override Builder Clone() {
+        if (resultIsReadOnly) {
+          return new Builder(result);
+        } else {
+          return new Builder().MergeFrom(result);
+        }
+      }
+
+      public override pbd::MessageDescriptor DescriptorForType {
+        get { return global::Google.ProtocolBuffers.TestProtos.TestReservedFields.Descriptor; }
+      }
+
+      public override TestReservedFields DefaultInstanceForType {
+        get { return global::Google.ProtocolBuffers.TestProtos.TestReservedFields.DefaultInstance; }
+      }
+
+      public override TestReservedFields BuildPartial() {
+        if (resultIsReadOnly) {
+          return result;
+        }
+        resultIsReadOnly = true;
+        return result.MakeReadOnly();
+      }
+
+      public override Builder MergeFrom(pb::IMessage other) {
+        if (other is TestReservedFields) {
+          return MergeFrom((TestReservedFields) other);
+        } else {
+          base.MergeFrom(other);
+          return this;
+        }
+      }
+
+      public override Builder MergeFrom(TestReservedFields other) {
+        if (other == global::Google.ProtocolBuffers.TestProtos.TestReservedFields.DefaultInstance) return this;
+        PrepareBuilder();
+        this.MergeUnknownFields(other.UnknownFields);
+        return this;
+      }
+
+      public override Builder MergeFrom(pb::ICodedInputStream input) {
+        return MergeFrom(input, pb::ExtensionRegistry.Empty);
+      }
+
+      public override Builder MergeFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+        PrepareBuilder();
+        pb::UnknownFieldSet.Builder unknownFields = null;
+        uint tag;
+        string field_name;
+        while (input.ReadTag(out tag, out field_name)) {
+          if(tag == 0 && field_name != null) {
+            int field_ordinal = global::System.Array.BinarySearch(_testReservedFieldsFieldNames, field_name, global::System.StringComparer.Ordinal);
+            if(field_ordinal >= 0)
+              tag = _testReservedFieldsFieldTags[field_ordinal];
+            else {
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              continue;
+            }
+          }
+          switch (tag) {
+            case 0: {
+              throw pb::InvalidProtocolBufferException.InvalidTag();
+            }
+            default: {
+              if (pb::WireFormat.IsEndGroupTag(tag)) {
+                if (unknownFields != null) {
+                  this.UnknownFields = unknownFields.Build();
+                }
+                return this;
+              }
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              break;
+            }
+          }
+        }
+
+        if (unknownFields != null) {
+          this.UnknownFields = unknownFields.Build();
+        }
+        return this;
+      }
+
+    }
+    static TestReservedFields() {
+      object.ReferenceEquals(global::Google.ProtocolBuffers.TestProtos.Unittest.Descriptor, null);
+    }
+  }
+
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
   public sealed partial class TestAllExtensions : pb::ExtendableMessage<TestAllExtensions, TestAllExtensions.Builder> {
     private TestAllExtensions() { }
     private static readonly TestAllExtensions defaultInstance = new TestAllExtensions().MakeReadOnly();
@@ -21288,44 +21639,49 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
     #endregion
 
+    private object foo_;
+    public enum FooOneofCase {
+      FooInt = 1,
+      FooString = 2,
+      FooMessage = 3,
+      FooGroup = 4,
+      None = 0,
+    }
+    private FooOneofCase fooCase_ = FooOneofCase.None;
+    public FooOneofCase FooCase {
+      get { return fooCase_; }
+    }
+
     public const int FooIntFieldNumber = 1;
-    private bool hasFooInt;
-    private int fooInt_;
     public bool HasFooInt {
-      get { return hasFooInt; }
+      get { return fooCase_ == FooOneofCase.FooInt; }
     }
     public int FooInt {
-      get { return fooInt_; }
+      get { return fooCase_ == FooOneofCase.FooInt ? (int) foo_ : 0; }
     }
 
     public const int FooStringFieldNumber = 2;
-    private bool hasFooString;
-    private string fooString_ = "";
     public bool HasFooString {
-      get { return hasFooString; }
+      get { return fooCase_ == FooOneofCase.FooString; }
     }
     public string FooString {
-      get { return fooString_; }
+      get { return fooCase_ == FooOneofCase.FooString ? (string) foo_ : ""; }
     }
 
     public const int FooMessageFieldNumber = 3;
-    private bool hasFooMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestAllTypes fooMessage_;
     public bool HasFooMessage {
-      get { return hasFooMessage; }
+      get { return fooCase_ == FooOneofCase.FooMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestAllTypes FooMessage {
-      get { return fooMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypes) foo_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance; }
     }
 
     public const int FooGroupFieldNumber = 4;
-    private bool hasFooGroup;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup fooGroup_;
     public bool HasFooGroup {
-      get { return hasFooGroup; }
+      get { return fooCase_ == FooOneofCase.FooGroup; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup FooGroup {
-      get { return fooGroup_ ?? global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooGroup ? (global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance; }
     }
 
     public override bool IsInitialized {
@@ -21337,16 +21693,16 @@ namespace Google.ProtocolBuffers.TestProtos {
     public override void WriteTo(pb::ICodedOutputStream output) {
       CalcSerializedSize();
       string[] field_names = _testOneofFieldNames;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         output.WriteInt32(1, field_names[0], FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         output.WriteString(2, field_names[2], FooString);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         output.WriteMessage(3, field_names[1], FooMessage);
       }
-      if (hasFooGroup) {
+      if (fooCase_ == FooOneofCase.FooGroup) {
         output.WriteGroup(4, field_names[3], FooGroup);
       }
       UnknownFields.WriteTo(output);
@@ -21366,16 +21722,16 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (size != -1) return size;
 
       size = 0;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         size += pb::CodedOutputStream.ComputeInt32Size(1, FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         size += pb::CodedOutputStream.ComputeStringSize(2, FooString);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(3, FooMessage);
       }
-      if (hasFooGroup) {
+      if (fooCase_ == FooOneofCase.FooGroup) {
         size += pb::CodedOutputStream.ComputeGroupSize(4, FooGroup);
       }
       size += UnknownFields.SerializedSize;
@@ -21500,17 +21856,24 @@ namespace Google.ProtocolBuffers.TestProtos {
       public override Builder MergeFrom(TestOneof other) {
         if (other == global::Google.ProtocolBuffers.TestProtos.TestOneof.DefaultInstance) return this;
         PrepareBuilder();
-        if (other.HasFooInt) {
-          FooInt = other.FooInt;
-        }
-        if (other.HasFooString) {
-          FooString = other.FooString;
-        }
-        if (other.HasFooMessage) {
-          MergeFooMessage(other.FooMessage);
-        }
-        if (other.HasFooGroup) {
-          MergeFooGroup(other.FooGroup);
+        switch (other.FooCase) {
+          case FooOneofCase.FooInt: {
+            SetFooInt(other.FooInt);
+            break;
+          }
+          case FooOneofCase.FooString: {
+            SetFooString(other.FooString);
+            break;
+          }
+          case FooOneofCase.FooMessage: {
+            MergeFooMessage(other.FooMessage);
+            break;
+          }
+          case FooOneofCase.FooGroup: {
+            MergeFooGroup(other.FooGroup);
+            break;
+          }
+          case FooOneofCase.None: { break; }
         }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
@@ -21556,29 +21919,39 @@ namespace Google.ProtocolBuffers.TestProtos {
               break;
             }
             case 8: {
-              result.hasFooInt = input.ReadInt32(ref result.fooInt_);
+              int value = 0;
+              if (input.ReadInt32(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooInt;
+              }
               break;
             }
             case 18: {
-              result.hasFooString = input.ReadString(ref result.fooString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooString;
+              }
               break;
             }
             case 26: {
               global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.CreateBuilder();
-              if (result.hasFooMessage) {
+              if (result.fooCase_ == FooOneofCase.FooMessage) {
                 subBuilder.MergeFrom(FooMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              FooMessage = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooMessage;
               break;
             }
             case 35: {
               global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.CreateBuilder();
-              if (result.hasFooGroup) {
+              if (result.fooCase_ == FooOneofCase.FooGroup) {
                 subBuilder.MergeFrom(FooGroup);
               }
               input.ReadGroup(4, subBuilder, extensionRegistry);
-              FooGroup = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooGroup;
               break;
             }
           }
@@ -21592,123 +21965,139 @@ namespace Google.ProtocolBuffers.TestProtos {
 
 
       public bool HasFooInt {
-        get { return result.hasFooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt; }
       }
       public int FooInt {
-        get { return result.FooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt ? (int) result.foo_ : 0; }
         set { SetFooInt(value); }
       }
       public Builder SetFooInt(int value) {
         PrepareBuilder();
-        result.hasFooInt = true;
-        result.fooInt_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooInt;
         return this;
       }
       public Builder ClearFooInt() {
         PrepareBuilder();
-        result.hasFooInt = false;
-        result.fooInt_ = 0;
+        if (result.fooCase_ == FooOneofCase.FooInt) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooString {
-        get { return result.hasFooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString; }
       }
       public string FooString {
-        get { return result.FooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString ? (string) result.foo_ : ""; }
         set { SetFooString(value); }
       }
       public Builder SetFooString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooString = true;
-        result.fooString_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooString;
         return this;
       }
       public Builder ClearFooString() {
         PrepareBuilder();
-        result.hasFooString = false;
-        result.fooString_ = "";
+        if (result.fooCase_ == FooOneofCase.FooString) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooMessage {
-       get { return result.hasFooMessage; }
+       get { return result.fooCase_ == FooOneofCase.FooMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestAllTypes FooMessage {
-        get { return result.FooMessage; }
+        get { return result.fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypes) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance; }
         set { SetFooMessage(value); }
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = value;
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooMessage &&
-            result.fooMessage_ != global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance) {
-            result.fooMessage_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.CreateBuilder(result.fooMessage_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooMessage &&
+            result.FooMessage != global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.CreateBuilder(result.FooMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.fooMessage_ = value;
+          result.foo_ = value;
         }
-        result.hasFooMessage = true;
+        result.fooCase_ = FooOneofCase.FooMessage;
         return this;
       }
       public Builder ClearFooMessage() {
-        PrepareBuilder();
-        result.hasFooMessage = false;
-        result.fooMessage_ = null;
+        if (result.fooCase_ == FooOneofCase.FooMessage) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
         return this;
       }
 
       public bool HasFooGroup {
-       get { return result.hasFooGroup; }
+       get { return result.fooCase_ == FooOneofCase.FooGroup; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup FooGroup {
-        get { return result.FooGroup; }
+        get { return result.fooCase_ == FooOneofCase.FooGroup ? (global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance; }
         set { SetFooGroup(value); }
       }
       public Builder SetFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooGroup = true;
-        result.fooGroup_ = value;
+        result.fooCase_ = FooOneofCase.FooGroup;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooGroup = true;
-        result.fooGroup_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooGroup;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooGroup &&
-            result.fooGroup_ != global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance) {
-            result.fooGroup_ = global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.CreateBuilder(result.fooGroup_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooGroup &&
+            result.FooGroup != global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.CreateBuilder(result.FooGroup).MergeFrom(value).BuildPartial();
         } else {
-          result.fooGroup_ = value;
+          result.foo_ = value;
         }
-        result.hasFooGroup = true;
+        result.fooCase_ = FooOneofCase.FooGroup;
         return this;
       }
       public Builder ClearFooGroup() {
+        if (result.fooCase_ == FooOneofCase.FooGroup) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
+        return this;
+      }
+
+      public FooOneofCase FooCase {
+        get { return result.fooCase_; }
+      }
+      public Builder ClearFoo() {
         PrepareBuilder();
-        result.hasFooGroup = false;
-        result.fooGroup_ = null;
+        result.foo_ = null;
+        result.fooCase_ = FooOneofCase.None;
         return this;
       }
     }
@@ -23191,154 +23580,157 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
     #endregion
 
+    private object foo_;
+    public enum FooOneofCase {
+      FooInt = 1,
+      FooString = 2,
+      FooCord = 3,
+      FooStringPiece = 4,
+      FooBytes = 5,
+      FooEnum = 6,
+      FooMessage = 7,
+      FooGroup = 8,
+      FooLazyMessage = 11,
+      None = 0,
+    }
+    private FooOneofCase fooCase_ = FooOneofCase.None;
+    public FooOneofCase FooCase {
+      get { return fooCase_; }
+    }
+
+    private object bar_;
+    public enum BarOneofCase {
+      BarInt = 12,
+      BarString = 13,
+      BarCord = 14,
+      BarStringPiece = 15,
+      BarBytes = 16,
+      BarEnum = 17,
+      None = 0,
+    }
+    private BarOneofCase barCase_ = BarOneofCase.None;
+    public BarOneofCase BarCase {
+      get { return barCase_; }
+    }
+
     public const int FooIntFieldNumber = 1;
-    private bool hasFooInt;
-    private int fooInt_;
     public bool HasFooInt {
-      get { return hasFooInt; }
+      get { return fooCase_ == FooOneofCase.FooInt; }
     }
     public int FooInt {
-      get { return fooInt_; }
+      get { return fooCase_ == FooOneofCase.FooInt ? (int) foo_ : 0; }
     }
 
     public const int FooStringFieldNumber = 2;
-    private bool hasFooString;
-    private string fooString_ = "";
     public bool HasFooString {
-      get { return hasFooString; }
+      get { return fooCase_ == FooOneofCase.FooString; }
     }
     public string FooString {
-      get { return fooString_; }
+      get { return fooCase_ == FooOneofCase.FooString ? (string) foo_ : ""; }
     }
 
     public const int FooCordFieldNumber = 3;
-    private bool hasFooCord;
-    private string fooCord_ = "";
     public bool HasFooCord {
-      get { return hasFooCord; }
+      get { return fooCase_ == FooOneofCase.FooCord; }
     }
     public string FooCord {
-      get { return fooCord_; }
+      get { return fooCase_ == FooOneofCase.FooCord ? (string) foo_ : ""; }
     }
 
     public const int FooStringPieceFieldNumber = 4;
-    private bool hasFooStringPiece;
-    private string fooStringPiece_ = "";
     public bool HasFooStringPiece {
-      get { return hasFooStringPiece; }
+      get { return fooCase_ == FooOneofCase.FooStringPiece; }
     }
     public string FooStringPiece {
-      get { return fooStringPiece_; }
+      get { return fooCase_ == FooOneofCase.FooStringPiece ? (string) foo_ : ""; }
     }
 
     public const int FooBytesFieldNumber = 5;
-    private bool hasFooBytes;
-    private pb::ByteString fooBytes_ = pb::ByteString.Empty;
     public bool HasFooBytes {
-      get { return hasFooBytes; }
+      get { return fooCase_ == FooOneofCase.FooBytes; }
     }
     public pb::ByteString FooBytes {
-      get { return fooBytes_; }
+      get { return fooCase_ == FooOneofCase.FooBytes ? (pb::ByteString) foo_ : pb::ByteString.Empty; }
     }
 
     public const int FooEnumFieldNumber = 6;
-    private bool hasFooEnum;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum fooEnum_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO;
     public bool HasFooEnum {
-      get { return hasFooEnum; }
+      get { return fooCase_ == FooOneofCase.FooEnum; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum FooEnum {
-      get { return fooEnum_; }
+      get { return fooCase_ == FooOneofCase.FooEnum ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO; }
     }
 
     public const int FooMessageFieldNumber = 7;
-    private bool hasFooMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage fooMessage_;
     public bool HasFooMessage {
-      get { return hasFooMessage; }
+      get { return fooCase_ == FooOneofCase.FooMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage FooMessage {
-      get { return fooMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
     }
 
     public const int FooGroupFieldNumber = 8;
-    private bool hasFooGroup;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup fooGroup_;
     public bool HasFooGroup {
-      get { return hasFooGroup; }
+      get { return fooCase_ == FooOneofCase.FooGroup; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup FooGroup {
-      get { return fooGroup_ ?? global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooGroup ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance; }
     }
 
     public const int FooLazyMessageFieldNumber = 11;
-    private bool hasFooLazyMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage fooLazyMessage_;
     public bool HasFooLazyMessage {
-      get { return hasFooLazyMessage; }
+      get { return fooCase_ == FooOneofCase.FooLazyMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage FooLazyMessage {
-      get { return fooLazyMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooLazyMessage ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
     }
 
     public const int BarIntFieldNumber = 12;
-    private bool hasBarInt;
-    private int barInt_ = 5;
     public bool HasBarInt {
-      get { return hasBarInt; }
+      get { return barCase_ == BarOneofCase.BarInt; }
     }
     public int BarInt {
-      get { return barInt_; }
+      get { return barCase_ == BarOneofCase.BarInt ? (int) bar_ : 5; }
     }
 
     public const int BarStringFieldNumber = 13;
-    private bool hasBarString;
-    private string barString_ = "STRING";
     public bool HasBarString {
-      get { return hasBarString; }
+      get { return barCase_ == BarOneofCase.BarString; }
     }
     public string BarString {
-      get { return barString_; }
+      get { return barCase_ == BarOneofCase.BarString ? (string) bar_ : "STRING"; }
     }
 
     public const int BarCordFieldNumber = 14;
-    private bool hasBarCord;
-    private string barCord_ = "CORD";
     public bool HasBarCord {
-      get { return hasBarCord; }
+      get { return barCase_ == BarOneofCase.BarCord; }
     }
     public string BarCord {
-      get { return barCord_; }
+      get { return barCase_ == BarOneofCase.BarCord ? (string) bar_ : "CORD"; }
     }
 
     public const int BarStringPieceFieldNumber = 15;
-    private bool hasBarStringPiece;
-    private string barStringPiece_ = "SPIECE";
     public bool HasBarStringPiece {
-      get { return hasBarStringPiece; }
+      get { return barCase_ == BarOneofCase.BarStringPiece; }
     }
     public string BarStringPiece {
-      get { return barStringPiece_; }
+      get { return barCase_ == BarOneofCase.BarStringPiece ? (string) bar_ : "SPIECE"; }
     }
 
     public const int BarBytesFieldNumber = 16;
-    private bool hasBarBytes;
-    private pb::ByteString barBytes_ = (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue;
     public bool HasBarBytes {
-      get { return hasBarBytes; }
+      get { return barCase_ == BarOneofCase.BarBytes; }
     }
     public pb::ByteString BarBytes {
-      get { return barBytes_; }
+      get { return barCase_ == BarOneofCase.BarBytes ? (pb::ByteString) bar_ : (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue; }
     }
 
     public const int BarEnumFieldNumber = 17;
-    private bool hasBarEnum;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum barEnum_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR;
     public bool HasBarEnum {
-      get { return hasBarEnum; }
+      get { return barCase_ == BarOneofCase.BarEnum; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum BarEnum {
-      get { return barEnum_; }
+      get { return barCase_ == BarOneofCase.BarEnum ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum) bar_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR; }
     }
 
     public const int BazIntFieldNumber = 18;
@@ -23370,49 +23762,49 @@ namespace Google.ProtocolBuffers.TestProtos {
     public override void WriteTo(pb::ICodedOutputStream output) {
       CalcSerializedSize();
       string[] field_names = _testOneof2FieldNames;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         output.WriteInt32(1, field_names[11], FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         output.WriteString(2, field_names[14], FooString);
       }
-      if (hasFooCord) {
+      if (fooCase_ == FooOneofCase.FooCord) {
         output.WriteString(3, field_names[9], FooCord);
       }
-      if (hasFooStringPiece) {
+      if (fooCase_ == FooOneofCase.FooStringPiece) {
         output.WriteString(4, field_names[15], FooStringPiece);
       }
-      if (hasFooBytes) {
+      if (fooCase_ == FooOneofCase.FooBytes) {
         output.WriteBytes(5, field_names[8], FooBytes);
       }
-      if (hasFooEnum) {
+      if (fooCase_ == FooOneofCase.FooEnum) {
         output.WriteEnum(6, field_names[10], (int) FooEnum, FooEnum);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         output.WriteMessage(7, field_names[13], FooMessage);
       }
-      if (hasFooGroup) {
+      if (fooCase_ == FooOneofCase.FooGroup) {
         output.WriteGroup(8, field_names[16], FooGroup);
       }
-      if (hasFooLazyMessage) {
+      if (fooCase_ == FooOneofCase.FooLazyMessage) {
         output.WriteMessage(11, field_names[12], FooLazyMessage);
       }
-      if (hasBarInt) {
+      if (barCase_ == BarOneofCase.BarInt) {
         output.WriteInt32(12, field_names[3], BarInt);
       }
-      if (hasBarString) {
+      if (barCase_ == BarOneofCase.BarString) {
         output.WriteString(13, field_names[4], BarString);
       }
-      if (hasBarCord) {
+      if (barCase_ == BarOneofCase.BarCord) {
         output.WriteString(14, field_names[1], BarCord);
       }
-      if (hasBarStringPiece) {
+      if (barCase_ == BarOneofCase.BarStringPiece) {
         output.WriteString(15, field_names[5], BarStringPiece);
       }
-      if (hasBarBytes) {
+      if (barCase_ == BarOneofCase.BarBytes) {
         output.WriteBytes(16, field_names[0], BarBytes);
       }
-      if (hasBarEnum) {
+      if (barCase_ == BarOneofCase.BarEnum) {
         output.WriteEnum(17, field_names[2], (int) BarEnum, BarEnum);
       }
       if (hasBazInt) {
@@ -23438,49 +23830,49 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (size != -1) return size;
 
       size = 0;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         size += pb::CodedOutputStream.ComputeInt32Size(1, FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         size += pb::CodedOutputStream.ComputeStringSize(2, FooString);
       }
-      if (hasFooCord) {
+      if (fooCase_ == FooOneofCase.FooCord) {
         size += pb::CodedOutputStream.ComputeStringSize(3, FooCord);
       }
-      if (hasFooStringPiece) {
+      if (fooCase_ == FooOneofCase.FooStringPiece) {
         size += pb::CodedOutputStream.ComputeStringSize(4, FooStringPiece);
       }
-      if (hasFooBytes) {
+      if (fooCase_ == FooOneofCase.FooBytes) {
         size += pb::CodedOutputStream.ComputeBytesSize(5, FooBytes);
       }
-      if (hasFooEnum) {
+      if (fooCase_ == FooOneofCase.FooEnum) {
         size += pb::CodedOutputStream.ComputeEnumSize(6, (int) FooEnum);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(7, FooMessage);
       }
-      if (hasFooGroup) {
+      if (fooCase_ == FooOneofCase.FooGroup) {
         size += pb::CodedOutputStream.ComputeGroupSize(8, FooGroup);
       }
-      if (hasFooLazyMessage) {
+      if (fooCase_ == FooOneofCase.FooLazyMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(11, FooLazyMessage);
       }
-      if (hasBarInt) {
+      if (barCase_ == BarOneofCase.BarInt) {
         size += pb::CodedOutputStream.ComputeInt32Size(12, BarInt);
       }
-      if (hasBarString) {
+      if (barCase_ == BarOneofCase.BarString) {
         size += pb::CodedOutputStream.ComputeStringSize(13, BarString);
       }
-      if (hasBarCord) {
+      if (barCase_ == BarOneofCase.BarCord) {
         size += pb::CodedOutputStream.ComputeStringSize(14, BarCord);
       }
-      if (hasBarStringPiece) {
+      if (barCase_ == BarOneofCase.BarStringPiece) {
         size += pb::CodedOutputStream.ComputeStringSize(15, BarStringPiece);
       }
-      if (hasBarBytes) {
+      if (barCase_ == BarOneofCase.BarBytes) {
         size += pb::CodedOutputStream.ComputeBytesSize(16, BarBytes);
       }
-      if (hasBarEnum) {
+      if (barCase_ == BarOneofCase.BarEnum) {
         size += pb::CodedOutputStream.ComputeEnumSize(17, (int) BarEnum);
       }
       if (hasBazInt) {
@@ -23611,57 +24003,78 @@ namespace Google.ProtocolBuffers.TestProtos {
       public override Builder MergeFrom(TestOneof2 other) {
         if (other == global::Google.ProtocolBuffers.TestProtos.TestOneof2.DefaultInstance) return this;
         PrepareBuilder();
-        if (other.HasFooInt) {
-          FooInt = other.FooInt;
-        }
-        if (other.HasFooString) {
-          FooString = other.FooString;
-        }
-        if (other.HasFooCord) {
-          FooCord = other.FooCord;
-        }
-        if (other.HasFooStringPiece) {
-          FooStringPiece = other.FooStringPiece;
-        }
-        if (other.HasFooBytes) {
-          FooBytes = other.FooBytes;
-        }
-        if (other.HasFooEnum) {
-          FooEnum = other.FooEnum;
-        }
-        if (other.HasFooMessage) {
-          MergeFooMessage(other.FooMessage);
-        }
-        if (other.HasFooGroup) {
-          MergeFooGroup(other.FooGroup);
-        }
-        if (other.HasFooLazyMessage) {
-          MergeFooLazyMessage(other.FooLazyMessage);
-        }
-        if (other.HasBarInt) {
-          BarInt = other.BarInt;
-        }
-        if (other.HasBarString) {
-          BarString = other.BarString;
-        }
-        if (other.HasBarCord) {
-          BarCord = other.BarCord;
-        }
-        if (other.HasBarStringPiece) {
-          BarStringPiece = other.BarStringPiece;
-        }
-        if (other.HasBarBytes) {
-          BarBytes = other.BarBytes;
-        }
-        if (other.HasBarEnum) {
-          BarEnum = other.BarEnum;
-        }
         if (other.HasBazInt) {
           BazInt = other.BazInt;
         }
         if (other.HasBazString) {
           BazString = other.BazString;
         }
+        switch (other.FooCase) {
+          case FooOneofCase.FooInt: {
+            SetFooInt(other.FooInt);
+            break;
+          }
+          case FooOneofCase.FooString: {
+            SetFooString(other.FooString);
+            break;
+          }
+          case FooOneofCase.FooCord: {
+            SetFooCord(other.FooCord);
+            break;
+          }
+          case FooOneofCase.FooStringPiece: {
+            SetFooStringPiece(other.FooStringPiece);
+            break;
+          }
+          case FooOneofCase.FooBytes: {
+            SetFooBytes(other.FooBytes);
+            break;
+          }
+          case FooOneofCase.FooEnum: {
+            SetFooEnum(other.FooEnum);
+            break;
+          }
+          case FooOneofCase.FooMessage: {
+            MergeFooMessage(other.FooMessage);
+            break;
+          }
+          case FooOneofCase.FooGroup: {
+            MergeFooGroup(other.FooGroup);
+            break;
+          }
+          case FooOneofCase.FooLazyMessage: {
+            MergeFooLazyMessage(other.FooLazyMessage);
+            break;
+          }
+          case FooOneofCase.None: { break; }
+        }
+        switch (other.BarCase) {
+          case BarOneofCase.BarInt: {
+            SetBarInt(other.BarInt);
+            break;
+          }
+          case BarOneofCase.BarString: {
+            SetBarString(other.BarString);
+            break;
+          }
+          case BarOneofCase.BarCord: {
+            SetBarCord(other.BarCord);
+            break;
+          }
+          case BarOneofCase.BarStringPiece: {
+            SetBarStringPiece(other.BarStringPiece);
+            break;
+          }
+          case BarOneofCase.BarBytes: {
+            SetBarBytes(other.BarBytes);
+            break;
+          }
+          case BarOneofCase.BarEnum: {
+            SetBarEnum(other.BarEnum);
+            break;
+          }
+          case BarOneofCase.None: { break; }
+        }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
       }
@@ -23706,29 +24119,51 @@ namespace Google.ProtocolBuffers.TestProtos {
               break;
             }
             case 8: {
-              result.hasFooInt = input.ReadInt32(ref result.fooInt_);
+              int value = 0;
+              if (input.ReadInt32(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooInt;
+              }
               break;
             }
             case 18: {
-              result.hasFooString = input.ReadString(ref result.fooString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooString;
+              }
               break;
             }
             case 26: {
-              result.hasFooCord = input.ReadString(ref result.fooCord_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooCord;
+              }
               break;
             }
             case 34: {
-              result.hasFooStringPiece = input.ReadString(ref result.fooStringPiece_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooStringPiece;
+              }
               break;
             }
             case 42: {
-              result.hasFooBytes = input.ReadBytes(ref result.fooBytes_);
+              pb::ByteString value = pb::ByteString.Empty;
+              if (input.ReadBytes(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooBytes;
+              }
               break;
             }
             case 48: {
               object unknown;
-              if(input.ReadEnum(ref result.fooEnum_, out unknown)) {
-                result.hasFooEnum = true;
+              global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum enumValue = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO;
+              if(input.ReadEnum(ref enumValue, out unknown)) {
+                result.foo_ = enumValue;
+                result.fooCase_ = FooOneofCase.FooEnum;
               } else if(unknown is int) {
                 if (unknownFields == null) {
                   unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
@@ -23739,55 +24174,80 @@ namespace Google.ProtocolBuffers.TestProtos {
             }
             case 58: {
               global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder();
-              if (result.hasFooMessage) {
+              if (result.fooCase_ == FooOneofCase.FooMessage) {
                 subBuilder.MergeFrom(FooMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              FooMessage = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooMessage;
               break;
             }
             case 67: {
               global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.CreateBuilder();
-              if (result.hasFooGroup) {
+              if (result.fooCase_ == FooOneofCase.FooGroup) {
                 subBuilder.MergeFrom(FooGroup);
               }
               input.ReadGroup(8, subBuilder, extensionRegistry);
-              FooGroup = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooGroup;
               break;
             }
             case 90: {
               global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder();
-              if (result.hasFooLazyMessage) {
+              if (result.fooCase_ == FooOneofCase.FooLazyMessage) {
                 subBuilder.MergeFrom(FooLazyMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              FooLazyMessage = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooLazyMessage;
               break;
             }
             case 96: {
-              result.hasBarInt = input.ReadInt32(ref result.barInt_);
+              int value = 5;
+              if (input.ReadInt32(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarInt;
+              }
               break;
             }
             case 106: {
-              result.hasBarString = input.ReadString(ref result.barString_);
+              string value = "STRING";
+              if (input.ReadString(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarString;
+              }
               break;
             }
             case 114: {
-              result.hasBarCord = input.ReadString(ref result.barCord_);
+              string value = "CORD";
+              if (input.ReadString(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarCord;
+              }
               break;
             }
             case 122: {
-              result.hasBarStringPiece = input.ReadString(ref result.barStringPiece_);
+              string value = "SPIECE";
+              if (input.ReadString(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarStringPiece;
+              }
               break;
             }
             case 130: {
-              result.hasBarBytes = input.ReadBytes(ref result.barBytes_);
+              pb::ByteString value = (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue;
+              if (input.ReadBytes(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarBytes;
+              }
               break;
             }
             case 136: {
               object unknown;
-              if(input.ReadEnum(ref result.barEnum_, out unknown)) {
-                result.hasBarEnum = true;
+              global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum enumValue = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR;
+              if(input.ReadEnum(ref enumValue, out unknown)) {
+                result.bar_ = enumValue;
+                result.barCase_ = BarOneofCase.BarEnum;
               } else if(unknown is int) {
                 if (unknownFields == null) {
                   unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
@@ -23815,370 +24275,388 @@ namespace Google.ProtocolBuffers.TestProtos {
 
 
       public bool HasFooInt {
-        get { return result.hasFooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt; }
       }
       public int FooInt {
-        get { return result.FooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt ? (int) result.foo_ : 0; }
         set { SetFooInt(value); }
       }
       public Builder SetFooInt(int value) {
         PrepareBuilder();
-        result.hasFooInt = true;
-        result.fooInt_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooInt;
         return this;
       }
       public Builder ClearFooInt() {
         PrepareBuilder();
-        result.hasFooInt = false;
-        result.fooInt_ = 0;
+        if (result.fooCase_ == FooOneofCase.FooInt) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooString {
-        get { return result.hasFooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString; }
       }
       public string FooString {
-        get { return result.FooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString ? (string) result.foo_ : ""; }
         set { SetFooString(value); }
       }
       public Builder SetFooString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooString = true;
-        result.fooString_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooString;
         return this;
       }
       public Builder ClearFooString() {
         PrepareBuilder();
-        result.hasFooString = false;
-        result.fooString_ = "";
+        if (result.fooCase_ == FooOneofCase.FooString) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooCord {
-        get { return result.hasFooCord; }
+        get { return result.fooCase_ == FooOneofCase.FooCord; }
       }
       public string FooCord {
-        get { return result.FooCord; }
+        get { return result.fooCase_ == FooOneofCase.FooCord ? (string) result.foo_ : ""; }
         set { SetFooCord(value); }
       }
       public Builder SetFooCord(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooCord = true;
-        result.fooCord_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooCord;
         return this;
       }
       public Builder ClearFooCord() {
         PrepareBuilder();
-        result.hasFooCord = false;
-        result.fooCord_ = "";
+        if (result.fooCase_ == FooOneofCase.FooCord) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooStringPiece {
-        get { return result.hasFooStringPiece; }
+        get { return result.fooCase_ == FooOneofCase.FooStringPiece; }
       }
       public string FooStringPiece {
-        get { return result.FooStringPiece; }
+        get { return result.fooCase_ == FooOneofCase.FooStringPiece ? (string) result.foo_ : ""; }
         set { SetFooStringPiece(value); }
       }
       public Builder SetFooStringPiece(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooStringPiece = true;
-        result.fooStringPiece_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooStringPiece;
         return this;
       }
       public Builder ClearFooStringPiece() {
         PrepareBuilder();
-        result.hasFooStringPiece = false;
-        result.fooStringPiece_ = "";
+        if (result.fooCase_ == FooOneofCase.FooStringPiece) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooBytes {
-        get { return result.hasFooBytes; }
+        get { return result.fooCase_ == FooOneofCase.FooBytes; }
       }
       public pb::ByteString FooBytes {
-        get { return result.FooBytes; }
+        get { return result.fooCase_ == FooOneofCase.FooBytes ? (pb::ByteString) result.foo_ : pb::ByteString.Empty; }
         set { SetFooBytes(value); }
       }
       public Builder SetFooBytes(pb::ByteString value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooBytes = true;
-        result.fooBytes_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooBytes;
         return this;
       }
       public Builder ClearFooBytes() {
         PrepareBuilder();
-        result.hasFooBytes = false;
-        result.fooBytes_ = pb::ByteString.Empty;
+        if (result.fooCase_ == FooOneofCase.FooBytes) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooEnum {
-       get { return result.hasFooEnum; }
+       get { return result.fooCase_ == FooOneofCase.FooEnum; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum FooEnum {
-        get { return result.FooEnum; }
+        get { return result.fooCase_ == FooOneofCase.FooEnum ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO; }
         set { SetFooEnum(value); }
       }
       public Builder SetFooEnum(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum value) {
         PrepareBuilder();
-        result.hasFooEnum = true;
-        result.fooEnum_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooEnum;
         return this;
       }
       public Builder ClearFooEnum() {
         PrepareBuilder();
-        result.hasFooEnum = false;
-        result.fooEnum_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO;
+        if (result.fooCase_ == FooOneofCase.FooEnum) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooMessage {
-       get { return result.hasFooMessage; }
+       get { return result.fooCase_ == FooOneofCase.FooMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage FooMessage {
-        get { return result.FooMessage; }
+        get { return result.fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
         set { SetFooMessage(value); }
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = value;
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooMessage &&
-            result.fooMessage_ != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance) {
-            result.fooMessage_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder(result.fooMessage_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooMessage &&
+            result.FooMessage != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder(result.FooMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.fooMessage_ = value;
+          result.foo_ = value;
         }
-        result.hasFooMessage = true;
+        result.fooCase_ = FooOneofCase.FooMessage;
         return this;
       }
       public Builder ClearFooMessage() {
-        PrepareBuilder();
-        result.hasFooMessage = false;
-        result.fooMessage_ = null;
+        if (result.fooCase_ == FooOneofCase.FooMessage) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
         return this;
       }
 
       public bool HasFooGroup {
-       get { return result.hasFooGroup; }
+       get { return result.fooCase_ == FooOneofCase.FooGroup; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup FooGroup {
-        get { return result.FooGroup; }
+        get { return result.fooCase_ == FooOneofCase.FooGroup ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance; }
         set { SetFooGroup(value); }
       }
       public Builder SetFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooGroup = true;
-        result.fooGroup_ = value;
+        result.fooCase_ = FooOneofCase.FooGroup;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooGroup = true;
-        result.fooGroup_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooGroup;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooGroup &&
-            result.fooGroup_ != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance) {
-            result.fooGroup_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.CreateBuilder(result.fooGroup_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooGroup &&
+            result.FooGroup != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.CreateBuilder(result.FooGroup).MergeFrom(value).BuildPartial();
         } else {
-          result.fooGroup_ = value;
+          result.foo_ = value;
         }
-        result.hasFooGroup = true;
+        result.fooCase_ = FooOneofCase.FooGroup;
         return this;
       }
       public Builder ClearFooGroup() {
-        PrepareBuilder();
-        result.hasFooGroup = false;
-        result.fooGroup_ = null;
+        if (result.fooCase_ == FooOneofCase.FooGroup) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
         return this;
       }
 
       public bool HasFooLazyMessage {
-       get { return result.hasFooLazyMessage; }
+       get { return result.fooCase_ == FooOneofCase.FooLazyMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage FooLazyMessage {
-        get { return result.FooLazyMessage; }
+        get { return result.fooCase_ == FooOneofCase.FooLazyMessage ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
         set { SetFooLazyMessage(value); }
       }
       public Builder SetFooLazyMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooLazyMessage = true;
-        result.fooLazyMessage_ = value;
+        result.fooCase_ = FooOneofCase.FooLazyMessage;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooLazyMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooLazyMessage = true;
-        result.fooLazyMessage_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooLazyMessage;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooLazyMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooLazyMessage &&
-            result.fooLazyMessage_ != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance) {
-            result.fooLazyMessage_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder(result.fooLazyMessage_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooLazyMessage &&
+            result.FooLazyMessage != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder(result.FooLazyMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.fooLazyMessage_ = value;
+          result.foo_ = value;
         }
-        result.hasFooLazyMessage = true;
+        result.fooCase_ = FooOneofCase.FooLazyMessage;
         return this;
       }
       public Builder ClearFooLazyMessage() {
-        PrepareBuilder();
-        result.hasFooLazyMessage = false;
-        result.fooLazyMessage_ = null;
+        if (result.fooCase_ == FooOneofCase.FooLazyMessage) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
         return this;
       }
 
       public bool HasBarInt {
-        get { return result.hasBarInt; }
+        get { return result.barCase_ == BarOneofCase.BarInt; }
       }
       public int BarInt {
-        get { return result.BarInt; }
+        get { return result.barCase_ == BarOneofCase.BarInt ? (int) result.bar_ : 5; }
         set { SetBarInt(value); }
       }
       public Builder SetBarInt(int value) {
         PrepareBuilder();
-        result.hasBarInt = true;
-        result.barInt_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarInt;
         return this;
       }
       public Builder ClearBarInt() {
         PrepareBuilder();
-        result.hasBarInt = false;
-        result.barInt_ = 5;
+        if (result.barCase_ == BarOneofCase.BarInt) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarString {
-        get { return result.hasBarString; }
+        get { return result.barCase_ == BarOneofCase.BarString; }
       }
       public string BarString {
-        get { return result.BarString; }
+        get { return result.barCase_ == BarOneofCase.BarString ? (string) result.bar_ : "STRING"; }
         set { SetBarString(value); }
       }
       public Builder SetBarString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasBarString = true;
-        result.barString_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarString;
         return this;
       }
       public Builder ClearBarString() {
         PrepareBuilder();
-        result.hasBarString = false;
-        result.barString_ = "STRING";
+        if (result.barCase_ == BarOneofCase.BarString) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarCord {
-        get { return result.hasBarCord; }
+        get { return result.barCase_ == BarOneofCase.BarCord; }
       }
       public string BarCord {
-        get { return result.BarCord; }
+        get { return result.barCase_ == BarOneofCase.BarCord ? (string) result.bar_ : "CORD"; }
         set { SetBarCord(value); }
       }
       public Builder SetBarCord(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasBarCord = true;
-        result.barCord_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarCord;
         return this;
       }
       public Builder ClearBarCord() {
         PrepareBuilder();
-        result.hasBarCord = false;
-        result.barCord_ = "CORD";
+        if (result.barCase_ == BarOneofCase.BarCord) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarStringPiece {
-        get { return result.hasBarStringPiece; }
+        get { return result.barCase_ == BarOneofCase.BarStringPiece; }
       }
       public string BarStringPiece {
-        get { return result.BarStringPiece; }
+        get { return result.barCase_ == BarOneofCase.BarStringPiece ? (string) result.bar_ : "SPIECE"; }
         set { SetBarStringPiece(value); }
       }
       public Builder SetBarStringPiece(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasBarStringPiece = true;
-        result.barStringPiece_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarStringPiece;
         return this;
       }
       public Builder ClearBarStringPiece() {
         PrepareBuilder();
-        result.hasBarStringPiece = false;
-        result.barStringPiece_ = "SPIECE";
+        if (result.barCase_ == BarOneofCase.BarStringPiece) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarBytes {
-        get { return result.hasBarBytes; }
+        get { return result.barCase_ == BarOneofCase.BarBytes; }
       }
       public pb::ByteString BarBytes {
-        get { return result.BarBytes; }
+        get { return result.barCase_ == BarOneofCase.BarBytes ? (pb::ByteString) result.bar_ : (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue; }
         set { SetBarBytes(value); }
       }
       public Builder SetBarBytes(pb::ByteString value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasBarBytes = true;
-        result.barBytes_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarBytes;
         return this;
       }
       public Builder ClearBarBytes() {
         PrepareBuilder();
-        result.hasBarBytes = false;
-        result.barBytes_ = (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue;
+        if (result.barCase_ == BarOneofCase.BarBytes) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarEnum {
-       get { return result.hasBarEnum; }
+       get { return result.barCase_ == BarOneofCase.BarEnum; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum BarEnum {
-        get { return result.BarEnum; }
+        get { return result.barCase_ == BarOneofCase.BarEnum ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum) result.bar_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR; }
         set { SetBarEnum(value); }
       }
       public Builder SetBarEnum(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum value) {
         PrepareBuilder();
-        result.hasBarEnum = true;
-        result.barEnum_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarEnum;
         return this;
       }
       public Builder ClearBarEnum() {
         PrepareBuilder();
-        result.hasBarEnum = false;
-        result.barEnum_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR;
+        if (result.barCase_ == BarOneofCase.BarEnum) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
@@ -24222,6 +24700,26 @@ namespace Google.ProtocolBuffers.TestProtos {
         result.bazString_ = "BAZ";
         return this;
       }
+
+      public FooOneofCase FooCase {
+        get { return result.fooCase_; }
+      }
+      public Builder ClearFoo() {
+        PrepareBuilder();
+        result.foo_ = null;
+        result.fooCase_ = FooOneofCase.None;
+        return this;
+      }
+
+      public BarOneofCase BarCase {
+        get { return result.barCase_; }
+      }
+      public Builder ClearBar() {
+        PrepareBuilder();
+        result.bar_ = null;
+        result.barCase_ = BarOneofCase.None;
+        return this;
+      }
     }
     static TestOneof2() {
       object.ReferenceEquals(global::Google.ProtocolBuffers.TestProtos.Unittest.Descriptor, null);
@@ -24536,34 +25034,40 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
     #endregion
 
+    private object foo_;
+    public enum FooOneofCase {
+      FooInt = 1,
+      FooString = 2,
+      FooMessage = 3,
+      None = 0,
+    }
+    private FooOneofCase fooCase_ = FooOneofCase.None;
+    public FooOneofCase FooCase {
+      get { return fooCase_; }
+    }
+
     public const int FooIntFieldNumber = 1;
-    private bool hasFooInt;
-    private int fooInt_;
     public bool HasFooInt {
-      get { return hasFooInt; }
+      get { return fooCase_ == FooOneofCase.FooInt; }
     }
     public int FooInt {
-      get { return fooInt_; }
+      get { return fooCase_ == FooOneofCase.FooInt ? (int) foo_ : 0; }
     }
 
     public const int FooStringFieldNumber = 2;
-    private bool hasFooString;
-    private string fooString_ = "";
     public bool HasFooString {
-      get { return hasFooString; }
+      get { return fooCase_ == FooOneofCase.FooString; }
     }
     public string FooString {
-      get { return fooString_; }
+      get { return fooCase_ == FooOneofCase.FooString ? (string) foo_ : ""; }
     }
 
     public const int FooMessageFieldNumber = 3;
-    private bool hasFooMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage fooMessage_;
     public bool HasFooMessage {
-      get { return hasFooMessage; }
+      get { return fooCase_ == FooOneofCase.FooMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage FooMessage {
-      get { return fooMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage) foo_ : global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance; }
     }
 
     public override bool IsInitialized {
@@ -24578,13 +25082,13 @@ namespace Google.ProtocolBuffers.TestProtos {
     public override void WriteTo(pb::ICodedOutputStream output) {
       CalcSerializedSize();
       string[] field_names = _testRequiredOneofFieldNames;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         output.WriteInt32(1, field_names[0], FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         output.WriteString(2, field_names[2], FooString);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         output.WriteMessage(3, field_names[1], FooMessage);
       }
       UnknownFields.WriteTo(output);
@@ -24604,13 +25108,13 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (size != -1) return size;
 
       size = 0;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         size += pb::CodedOutputStream.ComputeInt32Size(1, FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         size += pb::CodedOutputStream.ComputeStringSize(2, FooString);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(3, FooMessage);
       }
       size += UnknownFields.SerializedSize;
@@ -24735,14 +25239,20 @@ namespace Google.ProtocolBuffers.TestProtos {
       public override Builder MergeFrom(TestRequiredOneof other) {
         if (other == global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.DefaultInstance) return this;
         PrepareBuilder();
-        if (other.HasFooInt) {
-          FooInt = other.FooInt;
-        }
-        if (other.HasFooString) {
-          FooString = other.FooString;
-        }
-        if (other.HasFooMessage) {
-          MergeFooMessage(other.FooMessage);
+        switch (other.FooCase) {
+          case FooOneofCase.FooInt: {
+            SetFooInt(other.FooInt);
+            break;
+          }
+          case FooOneofCase.FooString: {
+            SetFooString(other.FooString);
+            break;
+          }
+          case FooOneofCase.FooMessage: {
+            MergeFooMessage(other.FooMessage);
+            break;
+          }
+          case FooOneofCase.None: { break; }
         }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
@@ -24788,20 +25298,29 @@ namespace Google.ProtocolBuffers.TestProtos {
               break;
             }
             case 8: {
-              result.hasFooInt = input.ReadInt32(ref result.fooInt_);
+              int value = 0;
+              if (input.ReadInt32(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooInt;
+              }
               break;
             }
             case 18: {
-              result.hasFooString = input.ReadString(ref result.fooString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooString;
+              }
               break;
             }
             case 26: {
               global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.CreateBuilder();
-              if (result.hasFooMessage) {
+              if (result.fooCase_ == FooOneofCase.FooMessage) {
                 subBuilder.MergeFrom(FooMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              FooMessage = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooMessage;
               break;
             }
           }
@@ -24815,83 +25334,97 @@ namespace Google.ProtocolBuffers.TestProtos {
 
 
       public bool HasFooInt {
-        get { return result.hasFooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt; }
       }
       public int FooInt {
-        get { return result.FooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt ? (int) result.foo_ : 0; }
         set { SetFooInt(value); }
       }
       public Builder SetFooInt(int value) {
         PrepareBuilder();
-        result.hasFooInt = true;
-        result.fooInt_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooInt;
         return this;
       }
       public Builder ClearFooInt() {
         PrepareBuilder();
-        result.hasFooInt = false;
-        result.fooInt_ = 0;
+        if (result.fooCase_ == FooOneofCase.FooInt) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooString {
-        get { return result.hasFooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString; }
       }
       public string FooString {
-        get { return result.FooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString ? (string) result.foo_ : ""; }
         set { SetFooString(value); }
       }
       public Builder SetFooString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooString = true;
-        result.fooString_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooString;
         return this;
       }
       public Builder ClearFooString() {
         PrepareBuilder();
-        result.hasFooString = false;
-        result.fooString_ = "";
+        if (result.fooCase_ == FooOneofCase.FooString) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooMessage {
-       get { return result.hasFooMessage; }
+       get { return result.fooCase_ == FooOneofCase.FooMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage FooMessage {
-        get { return result.FooMessage; }
+        get { return result.fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance; }
         set { SetFooMessage(value); }
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = value;
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooMessage(global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooMessage &&
-            result.fooMessage_ != global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance) {
-            result.fooMessage_ = global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.CreateBuilder(result.fooMessage_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooMessage &&
+            result.FooMessage != global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.CreateBuilder(result.FooMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.fooMessage_ = value;
+          result.foo_ = value;
         }
-        result.hasFooMessage = true;
+        result.fooCase_ = FooOneofCase.FooMessage;
         return this;
       }
       public Builder ClearFooMessage() {
+        if (result.fooCase_ == FooOneofCase.FooMessage) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
+        return this;
+      }
+
+      public FooOneofCase FooCase {
+        get { return result.fooCase_; }
+      }
+      public Builder ClearFoo() {
         PrepareBuilder();
-        result.hasFooMessage = false;
-        result.fooMessage_ = null;
+        result.foo_ = null;
+        result.fooCase_ = FooOneofCase.None;
         return this;
       }
     }
diff --git a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestNoFieldPresence.cs b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestNoFieldPresence.cs
index 0d212b72..52d7a69b 100644
--- a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestNoFieldPresence.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestNoFieldPresence.cs
@@ -97,7 +97,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
         internal__static_proto2_nofieldpresence_unittest_TestAllTypes__Descriptor = Descriptor.MessageTypes[0];
         internal__static_proto2_nofieldpresence_unittest_TestAllTypes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes, global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Builder>(internal__static_proto2_nofieldpresence_unittest_TestAllTypes__Descriptor,
-                new string[] { "OptionalInt32", "OptionalInt64", "OptionalUint32", "OptionalUint64", "OptionalSint32", "OptionalSint64", "OptionalFixed32", "OptionalFixed64", "OptionalSfixed32", "OptionalSfixed64", "OptionalFloat", "OptionalDouble", "OptionalBool", "OptionalString", "OptionalBytes", "OptionalNestedMessage", "OptionalForeignMessage", "OptionalProto2Message", "OptionalNestedEnum", "OptionalForeignEnum", "OptionalStringPiece", "OptionalCord", "OptionalLazyMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedProto2Message", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedStringPiece", "RepeatedCord", "RepeatedLazyMessage", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofEnum", });
+                new string[] { "OptionalInt32", "OptionalInt64", "OptionalUint32", "OptionalUint64", "OptionalSint32", "OptionalSint64", "OptionalFixed32", "OptionalFixed64", "OptionalSfixed32", "OptionalSfixed64", "OptionalFloat", "OptionalDouble", "OptionalBool", "OptionalString", "OptionalBytes", "OptionalNestedMessage", "OptionalForeignMessage", "OptionalProto2Message", "OptionalNestedEnum", "OptionalForeignEnum", "OptionalStringPiece", "OptionalCord", "OptionalLazyMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedProto2Message", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedStringPiece", "RepeatedCord", "RepeatedLazyMessage", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofEnum", "OneofField", });
         internal__static_proto2_nofieldpresence_unittest_TestAllTypes_NestedMessage__Descriptor = internal__static_proto2_nofieldpresence_unittest_TestAllTypes__Descriptor.NestedTypes[0];
         internal__static_proto2_nofieldpresence_unittest_TestAllTypes_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.Builder>(internal__static_proto2_nofieldpresence_unittest_TestAllTypes_NestedMessage__Descriptor,
@@ -431,6 +431,19 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
     #endregion
 
+    private object oneofField_;
+    public enum OneofFieldOneofCase {
+      OneofUint32 = 111,
+      OneofNestedMessage = 112,
+      OneofString = 113,
+      OneofEnum = 114,
+      None = 0,
+    }
+    private OneofFieldOneofCase oneofFieldCase_ = OneofFieldOneofCase.None;
+    public OneofFieldOneofCase OneofFieldCase {
+      get { return oneofFieldCase_; }
+    }
+
     public const int OptionalInt32FieldNumber = 1;
     private int optionalInt32_;
     public int OptionalInt32 {
@@ -586,6 +599,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedInt32FieldNumber = 31;
+    private int repeatedInt32MemoizedSerializedSize;
     private pbc::PopsicleList<int> repeatedInt32_ = new pbc::PopsicleList<int>();
     public scg::IList<int> RepeatedInt32List {
       get { return pbc::Lists.AsReadOnly(repeatedInt32_); }
@@ -598,6 +612,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedInt64FieldNumber = 32;
+    private int repeatedInt64MemoizedSerializedSize;
     private pbc::PopsicleList<long> repeatedInt64_ = new pbc::PopsicleList<long>();
     public scg::IList<long> RepeatedInt64List {
       get { return pbc::Lists.AsReadOnly(repeatedInt64_); }
@@ -610,6 +625,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedUint32FieldNumber = 33;
+    private int repeatedUint32MemoizedSerializedSize;
     private pbc::PopsicleList<uint> repeatedUint32_ = new pbc::PopsicleList<uint>();
     public scg::IList<uint> RepeatedUint32List {
       get { return pbc::Lists.AsReadOnly(repeatedUint32_); }
@@ -622,6 +638,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedUint64FieldNumber = 34;
+    private int repeatedUint64MemoizedSerializedSize;
     private pbc::PopsicleList<ulong> repeatedUint64_ = new pbc::PopsicleList<ulong>();
     public scg::IList<ulong> RepeatedUint64List {
       get { return pbc::Lists.AsReadOnly(repeatedUint64_); }
@@ -634,6 +651,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedSint32FieldNumber = 35;
+    private int repeatedSint32MemoizedSerializedSize;
     private pbc::PopsicleList<int> repeatedSint32_ = new pbc::PopsicleList<int>();
     public scg::IList<int> RepeatedSint32List {
       get { return pbc::Lists.AsReadOnly(repeatedSint32_); }
@@ -646,6 +664,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedSint64FieldNumber = 36;
+    private int repeatedSint64MemoizedSerializedSize;
     private pbc::PopsicleList<long> repeatedSint64_ = new pbc::PopsicleList<long>();
     public scg::IList<long> RepeatedSint64List {
       get { return pbc::Lists.AsReadOnly(repeatedSint64_); }
@@ -658,6 +677,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedFixed32FieldNumber = 37;
+    private int repeatedFixed32MemoizedSerializedSize;
     private pbc::PopsicleList<uint> repeatedFixed32_ = new pbc::PopsicleList<uint>();
     public scg::IList<uint> RepeatedFixed32List {
       get { return pbc::Lists.AsReadOnly(repeatedFixed32_); }
@@ -670,6 +690,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedFixed64FieldNumber = 38;
+    private int repeatedFixed64MemoizedSerializedSize;
     private pbc::PopsicleList<ulong> repeatedFixed64_ = new pbc::PopsicleList<ulong>();
     public scg::IList<ulong> RepeatedFixed64List {
       get { return pbc::Lists.AsReadOnly(repeatedFixed64_); }
@@ -682,6 +703,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedSfixed32FieldNumber = 39;
+    private int repeatedSfixed32MemoizedSerializedSize;
     private pbc::PopsicleList<int> repeatedSfixed32_ = new pbc::PopsicleList<int>();
     public scg::IList<int> RepeatedSfixed32List {
       get { return pbc::Lists.AsReadOnly(repeatedSfixed32_); }
@@ -694,6 +716,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedSfixed64FieldNumber = 40;
+    private int repeatedSfixed64MemoizedSerializedSize;
     private pbc::PopsicleList<long> repeatedSfixed64_ = new pbc::PopsicleList<long>();
     public scg::IList<long> RepeatedSfixed64List {
       get { return pbc::Lists.AsReadOnly(repeatedSfixed64_); }
@@ -706,6 +729,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedFloatFieldNumber = 41;
+    private int repeatedFloatMemoizedSerializedSize;
     private pbc::PopsicleList<float> repeatedFloat_ = new pbc::PopsicleList<float>();
     public scg::IList<float> RepeatedFloatList {
       get { return pbc::Lists.AsReadOnly(repeatedFloat_); }
@@ -718,6 +742,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedDoubleFieldNumber = 42;
+    private int repeatedDoubleMemoizedSerializedSize;
     private pbc::PopsicleList<double> repeatedDouble_ = new pbc::PopsicleList<double>();
     public scg::IList<double> RepeatedDoubleList {
       get { return pbc::Lists.AsReadOnly(repeatedDouble_); }
@@ -730,6 +755,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedBoolFieldNumber = 43;
+    private int repeatedBoolMemoizedSerializedSize;
     private pbc::PopsicleList<bool> repeatedBool_ = new pbc::PopsicleList<bool>();
     public scg::IList<bool> RepeatedBoolList {
       get { return pbc::Lists.AsReadOnly(repeatedBool_); }
@@ -802,6 +828,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedNestedEnumFieldNumber = 51;
+    private int repeatedNestedEnumMemoizedSerializedSize;
     private pbc::PopsicleList<global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum> repeatedNestedEnum_ = new pbc::PopsicleList<global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum>();
     public scg::IList<global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum> RepeatedNestedEnumList {
       get { return pbc::Lists.AsReadOnly(repeatedNestedEnum_); }
@@ -814,6 +841,7 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int RepeatedForeignEnumFieldNumber = 52;
+    private int repeatedForeignEnumMemoizedSerializedSize;
     private pbc::PopsicleList<global::Google.ProtocolBuffers.TestProtos.Proto3.ForeignEnum> repeatedForeignEnum_ = new pbc::PopsicleList<global::Google.ProtocolBuffers.TestProtos.Proto3.ForeignEnum>();
     public scg::IList<global::Google.ProtocolBuffers.TestProtos.Proto3.ForeignEnum> RepeatedForeignEnumList {
       get { return pbc::Lists.AsReadOnly(repeatedForeignEnum_); }
@@ -862,31 +890,23 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
     }
 
     public const int OneofUint32FieldNumber = 111;
-    private uint oneofUint32_;
     public uint OneofUint32 {
-      get { return oneofUint32_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofUint32 ? (uint) oneofField_ : 0; }
     }
 
     public const int OneofNestedMessageFieldNumber = 112;
-    private bool hasOneofNestedMessage;
-    private global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage oneofNestedMessage_;
-    public bool HasOneofNestedMessage {
-      get { return hasOneofNestedMessage; }
-    }
     public global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage OneofNestedMessage {
-      get { return oneofNestedMessage_ ?? global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.DefaultInstance; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage) oneofField_ : global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.DefaultInstance; }
     }
 
     public const int OneofStringFieldNumber = 113;
-    private string oneofString_ = "";
     public string OneofString {
-      get { return oneofString_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofString ? (string) oneofField_ : ""; }
     }
 
     public const int OneofEnumFieldNumber = 114;
-    private global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum oneofEnum_ = global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum.FOO;
     public global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum OneofEnum {
-      get { return oneofEnum_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofEnum ? (global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum) oneofField_ : global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum.FOO; }
     }
 
     public override void WriteTo(pb::ICodedOutputStream output) {
@@ -962,43 +982,43 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
         output.WriteMessage(30, field_names[15], OptionalLazyMessage);
       }
       if (repeatedInt32_.Count > 0) {
-        output.WriteInt32Array(31, field_names[36], repeatedInt32_);
+        output.WritePackedInt32Array(31, field_names[36], repeatedInt32MemoizedSerializedSize, repeatedInt32_);
       }
       if (repeatedInt64_.Count > 0) {
-        output.WriteInt64Array(32, field_names[37], repeatedInt64_);
+        output.WritePackedInt64Array(32, field_names[37], repeatedInt64MemoizedSerializedSize, repeatedInt64_);
       }
       if (repeatedUint32_.Count > 0) {
-        output.WriteUInt32Array(33, field_names[48], repeatedUint32_);
+        output.WritePackedUInt32Array(33, field_names[48], repeatedUint32MemoizedSerializedSize, repeatedUint32_);
       }
       if (repeatedUint64_.Count > 0) {
-        output.WriteUInt64Array(34, field_names[49], repeatedUint64_);
+        output.WritePackedUInt64Array(34, field_names[49], repeatedUint64MemoizedSerializedSize, repeatedUint64_);
       }
       if (repeatedSint32_.Count > 0) {
-        output.WriteSInt32Array(35, field_names[44], repeatedSint32_);
+        output.WritePackedSInt32Array(35, field_names[44], repeatedSint32MemoizedSerializedSize, repeatedSint32_);
       }
       if (repeatedSint64_.Count > 0) {
-        output.WriteSInt64Array(36, field_names[45], repeatedSint64_);
+        output.WritePackedSInt64Array(36, field_names[45], repeatedSint64MemoizedSerializedSize, repeatedSint64_);
       }
       if (repeatedFixed32_.Count > 0) {
-        output.WriteFixed32Array(37, field_names[31], repeatedFixed32_);
+        output.WritePackedFixed32Array(37, field_names[31], repeatedFixed32MemoizedSerializedSize, repeatedFixed32_);
       }
       if (repeatedFixed64_.Count > 0) {
-        output.WriteFixed64Array(38, field_names[32], repeatedFixed64_);
+        output.WritePackedFixed64Array(38, field_names[32], repeatedFixed64MemoizedSerializedSize, repeatedFixed64_);
       }
       if (repeatedSfixed32_.Count > 0) {
-        output.WriteSFixed32Array(39, field_names[42], repeatedSfixed32_);
+        output.WritePackedSFixed32Array(39, field_names[42], repeatedSfixed32MemoizedSerializedSize, repeatedSfixed32_);
       }
       if (repeatedSfixed64_.Count > 0) {
-        output.WriteSFixed64Array(40, field_names[43], repeatedSfixed64_);
+        output.WritePackedSFixed64Array(40, field_names[43], repeatedSfixed64MemoizedSerializedSize, repeatedSfixed64_);
       }
       if (repeatedFloat_.Count > 0) {
-        output.WriteFloatArray(41, field_names[33], repeatedFloat_);
+        output.WritePackedFloatArray(41, field_names[33], repeatedFloatMemoizedSerializedSize, repeatedFloat_);
       }
       if (repeatedDouble_.Count > 0) {
-        output.WriteDoubleArray(42, field_names[30], repeatedDouble_);
+        output.WritePackedDoubleArray(42, field_names[30], repeatedDoubleMemoizedSerializedSize, repeatedDouble_);
       }
       if (repeatedBool_.Count > 0) {
-        output.WriteBoolArray(43, field_names[27], repeatedBool_);
+        output.WritePackedBoolArray(43, field_names[27], repeatedBoolMemoizedSerializedSize, repeatedBool_);
       }
       if (repeatedString_.Count > 0) {
         output.WriteStringArray(44, field_names[46], repeatedString_);
@@ -1016,10 +1036,10 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
         output.WriteMessageArray(50, field_names[41], repeatedProto2Message_);
       }
       if (repeatedNestedEnum_.Count > 0) {
-        output.WriteEnumArray(51, field_names[39], repeatedNestedEnum_);
+        output.WritePackedEnumArray(51, field_names[39], repeatedNestedEnumMemoizedSerializedSize, repeatedNestedEnum_);
       }
       if (repeatedForeignEnum_.Count > 0) {
-        output.WriteEnumArray(52, field_names[34], repeatedForeignEnum_);
+        output.WritePackedEnumArray(52, field_names[34], repeatedForeignEnumMemoizedSerializedSize, repeatedForeignEnum_);
       }
       if (repeatedStringPiece_.Count > 0) {
         output.WriteStringArray(54, field_names[47], repeatedStringPiece_);
@@ -1030,16 +1050,16 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
       if (repeatedLazyMessage_.Count > 0) {
         output.WriteMessageArray(57, field_names[38], repeatedLazyMessage_);
       }
-      if (OneofUint32 != 0) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
         output.WriteUInt32(111, field_names[3], OneofUint32);
       }
-      if (hasOneofNestedMessage) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
         output.WriteMessage(112, field_names[1], OneofNestedMessage);
       }
-      if (OneofString != "") {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
         output.WriteString(113, field_names[2], OneofString);
       }
-      if (OneofEnum != global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum.FOO) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofEnum) {
         output.WriteEnum(114, field_names[0], (int) OneofEnum, OneofEnum);
       }
       UnknownFields.WriteTo(output);
@@ -1134,7 +1154,10 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
           dataSize += pb::CodedOutputStream.ComputeInt32SizeNoTag(element);
         }
         size += dataSize;
-        size += 2 * repeatedInt32_.Count;
+        if (repeatedInt32_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedInt32MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
@@ -1142,7 +1165,10 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
           dataSize += pb::CodedOutputStream.ComputeInt64SizeNoTag(element);
         }
         size += dataSize;
-        size += 2 * repeatedInt64_.Count;
+        if (repeatedInt64_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedInt64MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
@@ -1150,7 +1176,10 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
           dataSize += pb::CodedOutputStream.ComputeUInt32SizeNoTag(element);
         }
         size += dataSize;
-        size += 2 * repeatedUint32_.Count;
+        if (repeatedUint32_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedUint32MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
@@ -1158,7 +1187,10 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
           dataSize += pb::CodedOutputStream.ComputeUInt64SizeNoTag(element);
         }
         size += dataSize;
-        size += 2 * repeatedUint64_.Count;
+        if (repeatedUint64_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedUint64MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
@@ -1166,7 +1198,10 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
           dataSize += pb::CodedOutputStream.ComputeSInt32SizeNoTag(element);
         }
         size += dataSize;
-        size += 2 * repeatedSint32_.Count;
+        if (repeatedSint32_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedSint32MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
@@ -1174,49 +1209,73 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
           dataSize += pb::CodedOutputStream.ComputeSInt64SizeNoTag(element);
         }
         size += dataSize;
-        size += 2 * repeatedSint64_.Count;
+        if (repeatedSint64_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedSint64MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
         dataSize = 4 * repeatedFixed32_.Count;
         size += dataSize;
-        size += 2 * repeatedFixed32_.Count;
+        if (repeatedFixed32_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedFixed32MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
         dataSize = 8 * repeatedFixed64_.Count;
         size += dataSize;
-        size += 2 * repeatedFixed64_.Count;
+        if (repeatedFixed64_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedFixed64MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
         dataSize = 4 * repeatedSfixed32_.Count;
         size += dataSize;
-        size += 2 * repeatedSfixed32_.Count;
+        if (repeatedSfixed32_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedSfixed32MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
         dataSize = 8 * repeatedSfixed64_.Count;
         size += dataSize;
-        size += 2 * repeatedSfixed64_.Count;
+        if (repeatedSfixed64_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedSfixed64MemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
         dataSize = 4 * repeatedFloat_.Count;
         size += dataSize;
-        size += 2 * repeatedFloat_.Count;
+        if (repeatedFloat_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedFloatMemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
         dataSize = 8 * repeatedDouble_.Count;
         size += dataSize;
-        size += 2 * repeatedDouble_.Count;
+        if (repeatedDouble_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedDoubleMemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
         dataSize = 1 * repeatedBool_.Count;
         size += dataSize;
-        size += 2 * repeatedBool_.Count;
+        if (repeatedBool_.Count != 0) {
+          size += 2 + pb::CodedOutputStream.ComputeInt32SizeNoTag(dataSize);
+        }
+        repeatedBoolMemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
@@ -1250,8 +1309,10 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
             dataSize += pb::CodedOutputStream.ComputeEnumSizeNoTag((int) element);
           }
           size += dataSize;
-          size += 2 * repeatedNestedEnum_.Count;
+          size += 2;
+          size += pb::CodedOutputStream.ComputeRawVarint32Size((uint) dataSize);
         }
+        repeatedNestedEnumMemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
@@ -1260,8 +1321,10 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
             dataSize += pb::CodedOutputStream.ComputeEnumSizeNoTag((int) element);
           }
           size += dataSize;
-          size += 2 * repeatedForeignEnum_.Count;
+          size += 2;
+          size += pb::CodedOutputStream.ComputeRawVarint32Size((uint) dataSize);
         }
+        repeatedForeignEnumMemoizedSerializedSize = dataSize;
       }
       {
         int dataSize = 0;
@@ -1282,16 +1345,16 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
       foreach (global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage element in RepeatedLazyMessageList) {
         size += pb::CodedOutputStream.ComputeMessageSize(57, element);
       }
-      if (OneofUint32 != 0) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
         size += pb::CodedOutputStream.ComputeUInt32Size(111, OneofUint32);
       }
-      if (hasOneofNestedMessage) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(112, OneofNestedMessage);
       }
-      if (OneofString != "") {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
         size += pb::CodedOutputStream.ComputeStringSize(113, OneofString);
       }
-      if (OneofEnum != global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum.FOO) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofEnum) {
         size += pb::CodedOutputStream.ComputeEnumSize(114, (int) OneofEnum);
       }
       size += UnknownFields.SerializedSize;
@@ -1577,17 +1640,24 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
         if (other.repeatedLazyMessage_.Count != 0) {
           result.repeatedLazyMessage_.Add(other.repeatedLazyMessage_);
         }
-        if (other.OneofUint32 != 0) {
-          OneofUint32 = other.OneofUint32;
-        }
-        if (other.HasOneofNestedMessage) {
-          MergeOneofNestedMessage(other.OneofNestedMessage);
-        }
-        if (other.OneofString != "") {
-          OneofString = other.OneofString;
-        }
-        if (other.OneofEnum != global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum.FOO) {
-          OneofEnum = other.OneofEnum;
+        switch (other.OneofFieldCase) {
+          case OneofFieldOneofCase.OneofUint32: {
+            SetOneofUint32(other.OneofUint32);
+            break;
+          }
+          case OneofFieldOneofCase.OneofNestedMessage: {
+            MergeOneofNestedMessage(other.OneofNestedMessage);
+            break;
+          }
+          case OneofFieldOneofCase.OneofString: {
+            SetOneofString(other.OneofString);
+            break;
+          }
+          case OneofFieldOneofCase.OneofEnum: {
+            SetOneofEnum(other.OneofEnum);
+            break;
+          }
+          case OneofFieldOneofCase.None: { break; }
         }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
@@ -1884,25 +1954,37 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
               break;
             }
             case 888: {
-              input.ReadUInt32(ref result.oneofUint32_);
+              uint value = 0;
+              if (input.ReadUInt32(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofUint32;
+              }
               break;
             }
             case 898: {
               global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.CreateBuilder();
-              if (result.hasOneofNestedMessage) {
+              if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
                 subBuilder.MergeFrom(OneofNestedMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              OneofNestedMessage = subBuilder.BuildPartial();
+              result.oneofField_ = subBuilder.BuildPartial();
+              result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
               break;
             }
             case 906: {
-              input.ReadString(ref result.oneofString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofString;
+              }
               break;
             }
             case 912: {
               object unknown;
-              if(input.ReadEnum(ref result.oneofEnum_, out unknown)) {
+              global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum enumValue = global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum.FOO;
+              if(input.ReadEnum(ref enumValue, out unknown)) {
+                result.oneofField_ = enumValue;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofEnum;
               } else if(unknown is int) {
                 if (unknownFields == null) {
                   unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
@@ -3125,88 +3207,106 @@ namespace Google.ProtocolBuffers.TestProtos.Proto3 {
       }
 
       public uint OneofUint32 {
-        get { return result.OneofUint32; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32 ? (uint) result.oneofField_ : 0; }
         set { SetOneofUint32(value); }
       }
       public Builder SetOneofUint32(uint value) {
         PrepareBuilder();
-        result.oneofUint32_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofUint32;
         return this;
       }
       public Builder ClearOneofUint32() {
         PrepareBuilder();
-        result.oneofUint32_ = 0;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
         return this;
       }
 
-      public bool HasOneofNestedMessage {
-       get { return result.hasOneofNestedMessage; }
-      }
       public global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage OneofNestedMessage {
-        get { return result.OneofNestedMessage; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage) result.oneofField_ : global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.DefaultInstance; }
         set { SetOneofNestedMessage(value); }
       }
       public Builder SetOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofNestedMessage = true;
-        result.oneofNestedMessage_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
+        result.oneofField_ = value;
         return this;
       }
       public Builder SetOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasOneofNestedMessage = true;
-        result.oneofNestedMessage_ = builderForValue.Build();
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
+        result.oneofField_ = builderForValue.Build();
         return this;
       }
       public Builder MergeOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasOneofNestedMessage &&
-            result.oneofNestedMessage_ != global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.DefaultInstance) {
-            result.oneofNestedMessage_ = global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.CreateBuilder(result.oneofNestedMessage_).MergeFrom(value).BuildPartial();
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage &&
+            result.OneofNestedMessage != global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.DefaultInstance) {
+          result.oneofField_ = global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedMessage.CreateBuilder(result.OneofNestedMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.oneofNestedMessage_ = value;
+          result.oneofField_ = value;
         }
-        result.hasOneofNestedMessage = true;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
         return this;
       }
       public Builder ClearOneofNestedMessage() {
-        PrepareBuilder();
-        result.hasOneofNestedMessage = false;
-        result.oneofNestedMessage_ = null;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
+          PrepareBuilder();
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+          result.oneofField_ = null;
+        }
         return this;
       }
 
       public string OneofString {
-        get { return result.OneofString; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofString ? (string) result.oneofField_ : ""; }
         set { SetOneofString(value); }
       }
       public Builder SetOneofString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.oneofString_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofString;
         return this;
       }
       public Builder ClearOneofString() {
         PrepareBuilder();
-        result.oneofString_ = "";
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
         return this;
       }
 
       public global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum OneofEnum {
-        get { return result.OneofEnum; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofEnum ? (global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum) result.oneofField_ : global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum.FOO; }
         set { SetOneofEnum(value); }
       }
       public Builder SetOneofEnum(global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum value) {
         PrepareBuilder();
-        result.oneofEnum_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofEnum;
         return this;
       }
       public Builder ClearOneofEnum() {
         PrepareBuilder();
-        result.oneofEnum_ = global::Google.ProtocolBuffers.TestProtos.Proto3.TestAllTypes.Types.NestedEnum.FOO;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofEnum) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
+        return this;
+      }
+
+      public OneofFieldOneofCase OneofFieldCase {
+        get { return result.oneofFieldCase_; }
+      }
+      public Builder ClearOneofField() {
+        PrepareBuilder();
+        result.oneofField_ = null;
+        result.oneofFieldCase_ = OneofFieldOneofCase.None;
         return this;
       }
     }
diff --git a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestOptimizeFor.cs b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestOptimizeFor.cs
index 33e2ef4f..d07df059 100644
--- a/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestOptimizeFor.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestProtos/UnittestOptimizeFor.cs
@@ -54,7 +54,7 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestOptimizedForSize__Descriptor = Descriptor.MessageTypes[0];
         internal__static_protobuf_unittest_TestOptimizedForSize__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOptimizedForSize, global::Google.ProtocolBuffers.TestProtos.TestOptimizedForSize.Builder>(internal__static_protobuf_unittest_TestOptimizedForSize__Descriptor,
-                new string[] { "I", "Msg", "IntegerField", "StringField", });
+                new string[] { "I", "Msg", "IntegerField", "StringField", "Foo", });
         global::Google.ProtocolBuffers.TestProtos.TestOptimizedForSize.TestExtension = pb::GeneratedSingleExtension<int>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestOptimizedForSize.Descriptor.Extensions[0]);
         global::Google.ProtocolBuffers.TestProtos.TestOptimizedForSize.TestExtension2 = pb::GeneratedSingleExtension<global::Google.ProtocolBuffers.TestProtos.TestRequiredOptimizedForSize>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestOptimizedForSize.Descriptor.Extensions[1]);
         internal__static_protobuf_unittest_TestRequiredOptimizedForSize__Descriptor = Descriptor.MessageTypes[1];
@@ -107,6 +107,17 @@ namespace Google.ProtocolBuffers.TestProtos {
     public static pb::GeneratedExtensionBase<int> TestExtension;
     public const int TestExtension2FieldNumber = 1235;
     public static pb::GeneratedExtensionBase<global::Google.ProtocolBuffers.TestProtos.TestRequiredOptimizedForSize> TestExtension2;
+    private object foo_;
+    public enum FooOneofCase {
+      IntegerField = 2,
+      StringField = 3,
+      None = 0,
+    }
+    private FooOneofCase fooCase_ = FooOneofCase.None;
+    public FooOneofCase FooCase {
+      get { return fooCase_; }
+    }
+
     public const int IFieldNumber = 1;
     private bool hasI;
     private int i_;
@@ -128,23 +139,19 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
 
     public const int IntegerFieldFieldNumber = 2;
-    private bool hasIntegerField;
-    private int integerField_;
     public bool HasIntegerField {
-      get { return hasIntegerField; }
+      get { return fooCase_ == FooOneofCase.IntegerField; }
     }
     public int IntegerField {
-      get { return integerField_; }
+      get { return fooCase_ == FooOneofCase.IntegerField ? (int) foo_ : 0; }
     }
 
     public const int StringFieldFieldNumber = 3;
-    private bool hasStringField;
-    private string stringField_ = "";
     public bool HasStringField {
-      get { return hasStringField; }
+      get { return fooCase_ == FooOneofCase.StringField; }
     }
     public string StringField {
-      get { return stringField_; }
+      get { return fooCase_ == FooOneofCase.StringField ? (string) foo_ : ""; }
     }
 
     public static TestOptimizedForSize ParseFrom(pb::ByteString data) {
@@ -315,43 +322,55 @@ namespace Google.ProtocolBuffers.TestProtos {
       }
 
       public bool HasIntegerField {
-        get { return result.hasIntegerField; }
+        get { return result.fooCase_ == FooOneofCase.IntegerField; }
       }
       public int IntegerField {
-        get { return result.IntegerField; }
+        get { return result.fooCase_ == FooOneofCase.IntegerField ? (int) result.foo_ : 0; }
         set { SetIntegerField(value); }
       }
       public Builder SetIntegerField(int value) {
         PrepareBuilder();
-        result.hasIntegerField = true;
-        result.integerField_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.IntegerField;
         return this;
       }
       public Builder ClearIntegerField() {
         PrepareBuilder();
-        result.hasIntegerField = false;
-        result.integerField_ = 0;
+        if (result.fooCase_ == FooOneofCase.IntegerField) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasStringField {
-        get { return result.hasStringField; }
+        get { return result.fooCase_ == FooOneofCase.StringField; }
       }
       public string StringField {
-        get { return result.StringField; }
+        get { return result.fooCase_ == FooOneofCase.StringField ? (string) result.foo_ : ""; }
         set { SetStringField(value); }
       }
       public Builder SetStringField(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasStringField = true;
-        result.stringField_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.StringField;
         return this;
       }
       public Builder ClearStringField() {
         PrepareBuilder();
-        result.hasStringField = false;
-        result.stringField_ = "";
+        if (result.fooCase_ == FooOneofCase.StringField) {
+          result.fooCase_ = FooOneofCase.None;
+        }
+        return this;
+      }
+
+      public FooOneofCase FooCase {
+        get { return result.fooCase_; }
+      }
+      public Builder ClearFoo() {
+        PrepareBuilder();
+        result.foo_ = null;
+        result.fooCase_ = FooOneofCase.None;
         return this;
       }
     }
diff --git a/csharp/src/ProtocolBuffers.Test/TestResources.cs b/csharp/src/ProtocolBuffers.Test/TestResources.cs
index c978ca68..602874f7 100644
--- a/csharp/src/ProtocolBuffers.Test/TestResources.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestResources.cs
@@ -16,7 +16,7 @@ Q80CAICbQ9ECAAAAAACAakDRAgAAAAAAgHNA2AIB2AIA4gIDMjE14gIDMzE16gIDMjE26gIDMzE2
 8wL4AtkB9ALzAvgCvQL0AoIDAwjaAYIDAwi+AooDAwjbAYoDAwi/ApIDAwjcAZIDAwjAApgDApgD

 A6ADBaADBqgDCKgDCbIDAzIyNLIDAzMyNLoDAzIyNboDAzMyNegDkQPwA5ID+AOTA4AElAOIBKoG

 kASsBp0ElwEAAKEEmAEAAAAAAACtBJkBAACxBJoBAAAAAAAAvQQAgM1DwQQAAAAAAMB5QMgEANIE

-AzQxNdoEAzQxNogFAZAFBJgFB6IFAzQyNKoFAzQyNQ==

+AzQxNdoEAzQxNogFAZAFBJgFB6IFAzQyNKoFAzQyNZIHAzYwNA==

 ");

             }

         }

@@ -158,6 +158,7 @@ default_foreign_enum: FOREIGN_FOO
 default_import_enum: IMPORT_FOO

 default_string_piece: ""424""

 default_cord: ""425""

+oneof_bytes: ""604""

 

 ";

             }

@@ -286,6 +287,12 @@ default_cord: ""425""
 [protobuf_unittest.default_import_enum_extension]: IMPORT_FOO

 [protobuf_unittest.default_string_piece_extension]: ""424""

 [protobuf_unittest.default_cord_extension]: ""425""

+[protobuf_unittest.oneof_uint32_extension]: 601

+[protobuf_unittest.oneof_nested_message_extension] {

+  bb: 602

+}

+[protobuf_unittest.oneof_string_extension]: ""603""

+[protobuf_unittest.oneof_bytes_extension]: ""604""

 ";

             }

         }

diff --git a/csharp/src/ProtocolBuffers.Test/TestUtil.cs b/csharp/src/ProtocolBuffers.Test/TestUtil.cs
index 583e8090..c23c43f6 100644
--- a/csharp/src/ProtocolBuffers.Test/TestUtil.cs
+++ b/csharp/src/ProtocolBuffers.Test/TestUtil.cs
@@ -182,6 +182,11 @@ namespace Google.ProtocolBuffers
             registry.Add(Unittest.PackedDoubleExtension);

             registry.Add(Unittest.PackedBoolExtension);

             registry.Add(Unittest.PackedEnumExtension);

+

+            registry.Add(Unittest.OneofUint32Extension);

+            registry.Add(Unittest.OneofNestedMessageExtension);

+            registry.Add(Unittest.OneofStringExtension);

+            registry.Add(Unittest.OneofBytesExtension);

         }

 

         /// <summary>

@@ -316,6 +321,13 @@ namespace Google.ProtocolBuffers
 

             message.SetDefaultStringPiece("424");

             message.SetDefaultCord("425");

+

+            message.SetOneofUint32(601);

+            message.SetOneofNestedMessage(

+                TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(602).Build());

+            message.SetOneofString("603");

+            message.SetOneofBytes(ToBytes("604"));

+

         }

 

         /// <summary>

@@ -517,6 +529,13 @@ namespace Google.ProtocolBuffers
 

             Assert.AreEqual("424", message.DefaultStringPiece);

             Assert.AreEqual("425", message.DefaultCord);

+
+            Assert.IsFalse(message.HasOneofUint32);

+            Assert.IsFalse(message.HasOneofNestedMessage);

+            Assert.IsFalse(message.HasOneofString);

+            Assert.IsTrue(message.HasOneofBytes);

+

+            Assert.AreEqual(ToBytes("604"), message.OneofBytes);

         }

 

         internal static void AssertClear(TestAllTypes message)

@@ -661,6 +680,11 @@ namespace Google.ProtocolBuffers
 

             Assert.AreEqual("abc", message.DefaultStringPiece);

             Assert.AreEqual("123", message.DefaultCord);

+

+            Assert.IsFalse(message.HasOneofUint32);

+            Assert.IsFalse(message.HasOneofNestedMessage);

+            Assert.IsFalse(message.HasOneofString);

+            Assert.IsFalse(message.HasOneofBytes);

         }

 

         /// <summary>

@@ -817,6 +841,12 @@ namespace Google.ProtocolBuffers
 

             message.SetExtension(Unittest.DefaultStringPieceExtension, "424");

             message.SetExtension(Unittest.DefaultCordExtension, "425");

+

+            message.SetExtension(Unittest.OneofUint32Extension, 601U);

+            message.SetExtension(Unittest.OneofNestedMessageExtension,

+                TestAllTypes.Types.NestedMessage.CreateBuilder().SetBb(602).Build());

+            message.SetExtension(Unittest.OneofStringExtension, "603");

+            message.SetExtension(Unittest.OneofBytesExtension, ToBytes("604"));

         }

 

         internal static void ModifyRepeatedFields(TestAllTypes.Builder message)

@@ -1165,6 +1195,9 @@ namespace Google.ProtocolBuffers
 

             Assert.AreEqual("424", message.GetExtension(Unittest.DefaultStringPieceExtension));

             Assert.AreEqual("425", message.GetExtension(Unittest.DefaultCordExtension));

+

+            Assert.IsTrue(message.HasExtension(Unittest.OneofBytesExtension));

+            Assert.AreEqual(ToBytes("604"), message.GetExtension(Unittest.OneofBytesExtension));

         }

 

         /// <summary>

@@ -1451,6 +1484,11 @@ namespace Google.ProtocolBuffers
 

             Assert.AreEqual("abc", message.GetExtension(Unittest.DefaultStringPieceExtension));

             Assert.AreEqual("123", message.GetExtension(Unittest.DefaultCordExtension));

+

+            Assert.IsFalse(message.HasExtension(Unittest.OneofUint32Extension));

+            Assert.IsFalse(message.HasExtension(Unittest.OneofNestedMessageExtension));

+            Assert.IsFalse(message.HasExtension(Unittest.OneofStringExtension));

+            Assert.IsFalse(message.HasExtension(Unittest.OneofBytesExtension));

         }

 

         /// <summary>

@@ -1714,6 +1752,75 @@ namespace Google.ProtocolBuffers
             Assert.AreEqual(ForeignEnum.FOREIGN_BAZ, message.GetExtension(Unittest.UnpackedEnumExtension, 1));

         }

 

+        public static void AssertAtMostOneFieldSetOneof(TestOneof2 message)

+        {

+            int count = 0;

+            if (message.HasFooInt) { ++count; }

+            if (message.HasFooString) { ++count; }

+            if (message.HasFooCord) { ++count; }

+            if (message.HasFooStringPiece) { ++count; }

+            if (message.HasFooBytes) { ++count; }

+            if (message.HasFooEnum) { ++count; }

+            if (message.HasFooMessage) { ++count; }

+            if (message.HasFooGroup) { ++count; }

+            if (message.HasFooLazyMessage) { ++count; }

+            Assert.True(count <= 1);

+

+            count = 0;

+            if (message.HasBarInt) { ++count; }

+            if (message.HasBarString) { ++count; }

+            if (message.HasBarCord) { ++count; }

+            if (message.HasBarStringPiece) { ++count; }

+            if (message.HasBarBytes) { ++count; }

+            if (message.HasBarEnum) { ++count; }

+            Assert.True(count <= 1);

+

+            switch (message.FooCase)

+            {

+                case TestOneof2.FooOneofCase.FooInt:

+                    {

+                        Assert.True(message.HasFooInt);

+                        break;

+                    }

+                case TestOneof2.FooOneofCase.FooString:

+                    {

+                        Assert.True(message.HasFooString);

+                        break;

+                    }

+                case TestOneof2.FooOneofCase.FooCord:

+                    {

+                        Assert.True(message.HasFooCord);

+                        break;

+                    }

+                case TestOneof2.FooOneofCase.FooBytes:

+                    {

+                        Assert.True(message.HasFooBytes);

+                        break;

+                    }

+                case TestOneof2.FooOneofCase.FooEnum:

+                    {

+                        Assert.True(message.HasFooEnum);

+                        break;

+                    }

+                case TestOneof2.FooOneofCase.FooMessage:

+                    {

+                        Assert.True(message.HasFooMessage);

+                        break;

+                    }

+                case TestOneof2.FooOneofCase.FooGroup:

+                    {

+                        Assert.True(message.HasFooGroup);

+                        break;

+                    }

+                case TestOneof2.FooOneofCase.FooLazyMessage:

+                    {

+                        Assert.True(message.HasFooLazyMessage);

+                        break;

+                    }

+                case TestOneof2.FooOneofCase.None: { break; }

+            }

+        }

+

         private static readonly string[] TestCultures = {"en-US", "en-GB", "fr-FR", "de-DE"};

 

         public delegate void CultureAction();

diff --git a/csharp/src/ProtocolBuffers.Test/WireFormatTest.cs b/csharp/src/ProtocolBuffers.Test/WireFormatTest.cs
index 0c9b8c27..e728a176 100644
--- a/csharp/src/ProtocolBuffers.Test/WireFormatTest.cs
+++ b/csharp/src/ProtocolBuffers.Test/WireFormatTest.cs
@@ -164,7 +164,7 @@ namespace Google.ProtocolBuffers
         [Test]

         public void ExtensionsSerializedSize()

         {

-            Assert.AreEqual(TestUtil.GetAllSet().SerializedSize, TestUtil.GetAllExtensionsSet().SerializedSize);

+            Assert.IsTrue(TestUtil.GetAllSet().SerializedSize < TestUtil.GetAllExtensionsSet().SerializedSize);

         }

 

         private static void AssertFieldsInOrder(ByteString data)

diff --git a/csharp/src/ProtocolBuffers/AbstractBuilder.cs b/csharp/src/ProtocolBuffers/AbstractBuilder.cs
index e7a41fb3..8e33e931 100644
--- a/csharp/src/ProtocolBuffers/AbstractBuilder.cs
+++ b/csharp/src/ProtocolBuffers/AbstractBuilder.cs
@@ -58,8 +58,11 @@ namespace Google.ProtocolBuffers
         public abstract int GetRepeatedFieldCount(FieldDescriptor field);

         public abstract object this[FieldDescriptor field, int index] { get; set; }

         public abstract bool HasField(FieldDescriptor field);

+        public abstract bool HasOneof(OneofDescriptor oneof);

+        public abstract FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof);

         public abstract IBuilder CreateBuilderForField(FieldDescriptor field);

         public abstract TBuilder ClearField(FieldDescriptor field);

+        public abstract TBuilder ClearOneof(OneofDescriptor oneof);

         public abstract TBuilder AddRepeatedField(FieldDescriptor field, object value);

 

         #endregion

@@ -248,6 +251,11 @@ namespace Google.ProtocolBuffers
             return ClearField(field);

         }

 

+        IBuilder IBuilder.WeakClearOneof(OneofDescriptor oneof)

+        {

+            return ClearOneof(oneof);

+        }

+

         #endregion

 

         /// <summary>

diff --git a/csharp/src/ProtocolBuffers/AbstractMessage.cs b/csharp/src/ProtocolBuffers/AbstractMessage.cs
index 16c8c786..ef057e6f 100644
--- a/csharp/src/ProtocolBuffers/AbstractMessage.cs
+++ b/csharp/src/ProtocolBuffers/AbstractMessage.cs
@@ -62,6 +62,8 @@ namespace Google.ProtocolBuffers
         public abstract MessageDescriptor DescriptorForType { get; }

         public abstract IDictionary<FieldDescriptor, object> AllFields { get; }

         public abstract bool HasField(FieldDescriptor field);

+        public abstract bool HasOneof(OneofDescriptor oneof);

+        public abstract FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof);

         public abstract object this[FieldDescriptor field] { get; }

         public abstract int GetRepeatedFieldCount(FieldDescriptor field);

         public abstract object this[FieldDescriptor field, int index] { get; }

diff --git a/csharp/src/ProtocolBuffers/Descriptors/FieldDescriptor.cs b/csharp/src/ProtocolBuffers/Descriptors/FieldDescriptor.cs
index 076dc852..e7f5a3c1 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/FieldDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Descriptors/FieldDescriptor.cs
@@ -47,6 +47,7 @@ namespace Google.ProtocolBuffers.Descriptors
         private EnumDescriptor enumType;

         private MessageDescriptor messageType;

         private MessageDescriptor containingType;

+        private OneofDescriptor containingOneof;

         private object defaultValue;

         private FieldType fieldType;

         private MappedType mappedType;

@@ -94,6 +95,16 @@ namespace Google.ProtocolBuffers.Descriptors
                                                             "FieldDescriptorProto.Extendee set for non-extension field.");

                 }

                 containingType = parent;

+                if (proto.HasOneofIndex)

+                {

+                    if (proto.OneofIndex < 0 || proto.OneofIndex >= parent.Proto.OneofDeclCount)

+                    {

+                        throw new DescriptorValidationException(this,

+                            "FieldDescriptorProto.oneof_index is out of range for type " + parent.Name);

+                    }

+                    containingOneof = parent.Oneofs[proto.OneofIndex];

+                    containingOneof.fieldCount ++;

+                }

                 extensionScope = null;

             }

 

@@ -253,7 +264,12 @@ namespace Google.ProtocolBuffers.Descriptors
         {

             get { return containingType; }

         }

-        

+

+        public OneofDescriptor ContainingOneof

+        {

+            get { return containingOneof; }

+        }

+

         /// <summary>

         /// For extensions defined nested within message types, gets

         /// the outer type. Not valid for non-extension fields.

diff --git a/csharp/src/ProtocolBuffers/Descriptors/MessageDescriptor.cs b/csharp/src/ProtocolBuffers/Descriptors/MessageDescriptor.cs
index 5b29849c..c00711b9 100644
--- a/csharp/src/ProtocolBuffers/Descriptors/MessageDescriptor.cs
+++ b/csharp/src/ProtocolBuffers/Descriptors/MessageDescriptor.cs
@@ -45,6 +45,7 @@ namespace Google.ProtocolBuffers.Descriptors
         private readonly IList<EnumDescriptor> enumTypes;

         private readonly IList<FieldDescriptor> fields;

         private readonly IList<FieldDescriptor> extensions;

+        private readonly IList<OneofDescriptor> oneofs;

         private bool hasRequiredFields;

 

         internal MessageDescriptor(DescriptorProto proto, FileDescriptor file, MessageDescriptor parent, int typeIndex)

@@ -52,6 +53,10 @@ namespace Google.ProtocolBuffers.Descriptors
         {

             containingType = parent;

 

+            oneofs = DescriptorUtil.ConvertAndMakeReadOnly(proto.OneofDeclList,

+                                                               (oneof, index) =>

+                                                               new OneofDescriptor(oneof, file, this, index));

+

             nestedTypes = DescriptorUtil.ConvertAndMakeReadOnly(proto.NestedTypeList,

                                                                 (type, index) =>

                                                                 new MessageDescriptor(type, file, this, index));

@@ -69,6 +74,19 @@ namespace Google.ProtocolBuffers.Descriptors
                                                                (field, index) =>

                                                                new FieldDescriptor(field, file, this, index, true));

 

+            for (int i = 0; i < proto.OneofDeclCount; i++)

+            {

+                oneofs[i].fields = new FieldDescriptor[oneofs[i].FieldCount];

+                oneofs[i].fieldCount = 0;

+            }

+            for (int i = 0; i< proto.FieldCount; i++)

+            {

+                OneofDescriptor oneofDescriptor = fields[i].ContainingOneof;

+                if (oneofDescriptor != null)

+                {

+                    oneofDescriptor.fields[oneofDescriptor.fieldCount++] = fields[i];

+                }

+            }

             file.DescriptorPool.AddSymbol(this);

         }

 

@@ -112,6 +130,11 @@ namespace Google.ProtocolBuffers.Descriptors
             get { return enumTypes; }

         }

 

+        public IList<OneofDescriptor> Oneofs

+        {

+            get { return oneofs; }

+        }

+

         /// <summary>

         /// Returns a pre-computed result as to whether this message

         /// has required fields. This includes optional fields which are

@@ -189,6 +212,11 @@ namespace Google.ProtocolBuffers.Descriptors
             {

                 extension.CrossLink();

             }

+

+            foreach (OneofDescriptor oneof in oneofs)

+            {

+               // oneof.C

+            }

         }

 

         internal void CheckRequiredFields()

diff --git a/csharp/src/ProtocolBuffers/Descriptors/OneofDescriptor.cs b/csharp/src/ProtocolBuffers/Descriptors/OneofDescriptor.cs
new file mode 100644
index 00000000..aa62853b
--- /dev/null
+++ b/csharp/src/ProtocolBuffers/Descriptors/OneofDescriptor.cs
@@ -0,0 +1,78 @@
+// Protocol Buffers - Google's data interchange format

+// Copyright 2015 Google Inc.  All rights reserved.

+// Author: jieluo@google.com (Jie Luo)

+//

+// Redistribution and use in source and binary forms, with or without

+// modification, are permitted provided that the following conditions are

+// met:

+//

+//     * Redistributions of source code must retain the above copyright

+// notice, this list of conditions and the following disclaimer.

+//     * Redistributions in binary form must reproduce the above

+// copyright notice, this list of conditions and the following disclaimer

+// in the documentation and/or other materials provided with the

+// distribution.

+//     * Neither the name of Google Inc. nor the names of its

+// contributors may be used to endorse or promote products derived from

+// this software without specific prior written permission.

+//

+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

+using System;

+using System.Collections.Generic;

+using System.Linq;

+using System.Text;

+using Google.ProtocolBuffers.DescriptorProtos;

+

+namespace Google.ProtocolBuffers.Descriptors

+{

+    public sealed class OneofDescriptor

+    {

+        private int index;

+        private OneofDescriptorProto proto;

+        private FileDescriptor file;

+        private MessageDescriptor containingType;

+        internal int fieldCount;

+        internal IList<FieldDescriptor> fields;

+

+        internal OneofDescriptor(OneofDescriptorProto proto, FileDescriptor file,

+                                 MessageDescriptor parent, int index)

+        {

+            this.proto = proto;

+            this.file = file;

+            this.index = index;

+

+            containingType = parent;

+            fieldCount = 0;

+        }

+

+        public int Index

+        {

+            get { return index; }

+        }

+

+        public MessageDescriptor ContainingType

+        {

+            get { return containingType; }

+        }

+

+        public int FieldCount

+        {

+            get { return fieldCount; }

+        }

+

+        public FieldDescriptor Field(int index)

+        {

+            return fields[index];

+        }

+    }

+}

diff --git a/csharp/src/ProtocolBuffers/DynamicMessage.cs b/csharp/src/ProtocolBuffers/DynamicMessage.cs
index e39efb12..0a8772ca 100644
--- a/csharp/src/ProtocolBuffers/DynamicMessage.cs
+++ b/csharp/src/ProtocolBuffers/DynamicMessage.cs
@@ -48,6 +48,7 @@ namespace Google.ProtocolBuffers
     {

         private readonly MessageDescriptor type;

         private readonly FieldSet fields;

+        private readonly FieldDescriptor[] oneofCase;

         private readonly UnknownFieldSet unknownFields;

         private int memoizedSize = -1;

 

@@ -57,10 +58,12 @@ namespace Google.ProtocolBuffers
         /// <param name="type"></param>

         /// <param name="fields"></param>

         /// <param name="unknownFields"></param>

-        private DynamicMessage(MessageDescriptor type, FieldSet fields, UnknownFieldSet unknownFields)

+        private DynamicMessage(MessageDescriptor type, FieldSet fields,

+            FieldDescriptor[] oneofCase, UnknownFieldSet unknownFields)

         {

             this.type = type;

             this.fields = fields;

+            this.oneofCase = oneofCase;

             this.unknownFields = unknownFields;

         }

 

@@ -71,7 +74,9 @@ namespace Google.ProtocolBuffers
         /// <returns></returns>

         public static DynamicMessage GetDefaultInstance(MessageDescriptor type)

         {

-            return new DynamicMessage(type, FieldSet.DefaultInstance, UnknownFieldSet.DefaultInstance);

+            int oneofDescriptorCount = type.Proto.OneofDeclCount;

+            FieldDescriptor[] oneofCase = new FieldDescriptor[oneofDescriptorCount];

+            return new DynamicMessage(type, FieldSet.DefaultInstance, oneofCase, UnknownFieldSet.DefaultInstance);

         }

 

         /// <summary>

@@ -201,6 +206,23 @@ namespace Google.ProtocolBuffers
             get { return fields.AllFieldDescriptors; }

         }

 

+        public override bool HasOneof(OneofDescriptor oneof)

+        {

+            VerifyContainingOneofType(oneof);

+            FieldDescriptor field = oneofCase[oneof.Index];

+            if (field == null)

+            {

+                return false;

+            }

+            return true;

+        }

+

+        public override FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof)

+        {

+            VerifyContainingOneofType(oneof);

+            return oneofCase[oneof.Index];

+        }

+

         public override bool HasField(FieldDescriptor field)

         {

             VerifyContainingType(field);

@@ -306,12 +328,24 @@ namespace Google.ProtocolBuffers
         }

 

         /// <summary>

+        /// Verifies that the oneof is an oneof of this message.

+        /// </summary>

+        private void VerifyContainingOneofType(OneofDescriptor oneof)

+        {

+            if (oneof.ContainingType != type)

+            {

+                throw new ArgumentException("OneofDescritpor does not match message type");

+            }

+        }

+

+        /// <summary>

         /// Builder for dynamic messages. Instances are created with DynamicMessage.CreateBuilder.

         /// </summary>

         public sealed partial class Builder : AbstractBuilder<DynamicMessage, Builder>

         {

             private readonly MessageDescriptor type;

             private FieldSet fields;

+            private FieldDescriptor[] oneofCase;

             private UnknownFieldSet unknownFields;

 

             internal Builder(MessageDescriptor type)

@@ -319,6 +353,7 @@ namespace Google.ProtocolBuffers
                 this.type = type;

                 this.fields = FieldSet.CreateInstance();

                 this.unknownFields = UnknownFieldSet.DefaultInstance;

+                this.oneofCase = new FieldDescriptor[type.Proto.OneofDeclCount];

             }

 

             protected override Builder ThisBuilder

@@ -340,6 +375,23 @@ namespace Google.ProtocolBuffers
                 }

                 fields.MergeFrom(other);

                 MergeUnknownFields(other.UnknownFields);

+                for (int i = 0; i < oneofCase.Length; i++)

+                {

+                    if (other.HasOneof(type.Oneofs[i]))

+                    {

+                        if (oneofCase[i] == null)

+                        {

+                            oneofCase[i] = other.OneofFieldDescriptor(type.Oneofs[i]);

+                        } else

+                        {

+                            if (oneofCase[i] != other.OneofFieldDescriptor(type.Oneofs[i]))

+                            {

+                                fields.ClearField(oneofCase[i]);

+                                oneofCase[i] = other.OneofFieldDescriptor(type.Oneofs[i]);

+                            }

+                        }

+                    }

+                }

                 return this;

             }

 

@@ -353,7 +405,7 @@ namespace Google.ProtocolBuffers
             {

                 if (fields != null && !IsInitialized)

                 {

-                    throw new UninitializedMessageException(new DynamicMessage(type, fields, unknownFields));

+                    throw new UninitializedMessageException(new DynamicMessage(type, fields, oneofCase, unknownFields));

                 }

                 return BuildPartial();

             }

@@ -367,7 +419,7 @@ namespace Google.ProtocolBuffers
             {

                 if (!IsInitialized)

                 {

-                    throw new UninitializedMessageException(new DynamicMessage(type, fields, unknownFields)).

+                    throw new UninitializedMessageException(new DynamicMessage(type, fields, oneofCase, unknownFields)).

                         AsInvalidProtocolBufferException();

                 }

                 return BuildPartial();

@@ -380,7 +432,7 @@ namespace Google.ProtocolBuffers
                     throw new InvalidOperationException("Build() has already been called on this Builder.");

                 }

                 fields.MakeImmutable();

-                DynamicMessage result = new DynamicMessage(type, fields, unknownFields);

+                DynamicMessage result = new DynamicMessage(type, fields, oneofCase, unknownFields);

                 fields = null;

                 unknownFields = null;

                 return result;

@@ -390,6 +442,7 @@ namespace Google.ProtocolBuffers
             {

                 Builder result = new Builder(type);

                 result.fields.MergeFrom(fields);

+                result.oneofCase = oneofCase;

                 return result;

             }

 

@@ -431,6 +484,23 @@ namespace Google.ProtocolBuffers
                 return new Builder(field.MessageType);

             }

 

+            public override bool HasOneof(OneofDescriptor oneof)

+            {

+                VerifyContainingOneofType(oneof);

+                FieldDescriptor field = oneofCase[oneof.Index];

+                if (field == null)

+                {

+                    return false;

+                }

+                return true;

+            }

+

+            public override FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof)

+            {

+                VerifyContainingOneofType(oneof);

+                return oneofCase[oneof.Index];

+            }

+

             public override bool HasField(FieldDescriptor field)

             {

                 VerifyContainingType(field);

@@ -466,6 +536,17 @@ namespace Google.ProtocolBuffers
                 set

                 {

                     VerifyContainingType(field);

+                    OneofDescriptor oneof = field.ContainingOneof;

+                    if (oneof != null)

+                    {

+                        int index = oneof.Index;

+                        FieldDescriptor oldField = oneofCase[index];

+                        if ((oldField != null) && (oldField != field))

+                        {

+                            fields.ClearField(oldField);

+                        }

+                        oneofCase[index] = field;

+                    }

                     fields[field] = value;

                 }

             }

@@ -473,10 +554,30 @@ namespace Google.ProtocolBuffers
             public override Builder ClearField(FieldDescriptor field)

             {

                 VerifyContainingType(field);

+                OneofDescriptor oneof = field.ContainingOneof;

+                if (oneof != null)

+                {

+                    int index = oneof.Index;

+                    if (oneofCase[index] == field)

+                    {

+                        oneofCase[index] = null;

+                    }

+                }

                 fields.ClearField(field);

                 return this;

             }

 

+            public override Builder ClearOneof(OneofDescriptor oneof)

+            {

+                VerifyContainingOneofType(oneof);

+                FieldDescriptor field = oneofCase[oneof.Index];

+                if (field != null)

+                {

+                    ClearField(field);

+                }

+                return this;

+            }

+

             public override int GetRepeatedFieldCount(FieldDescriptor field)

             {

                 VerifyContainingType(field);

@@ -507,6 +608,17 @@ namespace Google.ProtocolBuffers
                     throw new ArgumentException("FieldDescriptor does not match message type.");

                 }

             }

+

+            /// <summary>

+            /// Verifies that the oneof is an oneof of this message.

+            /// </summary>

+            private void VerifyContainingOneofType(OneofDescriptor oneof)

+            {

+                if (oneof.ContainingType != type)

+                {

+                    throw new ArgumentException("OneofDescriptor does not match message type");

+                }

+            }

         }

     }

 }
\ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs b/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs
index 6e20b14e..ad1a4382 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs
+++ b/csharp/src/ProtocolBuffers/FieldAccess/FieldAccessorTable.cs
@@ -45,6 +45,7 @@ namespace Google.ProtocolBuffers.FieldAccess
         where TBuilder : IBuilder<TMessage, TBuilder>

     {

         private readonly IFieldAccessor<TMessage, TBuilder>[] accessors;

+        private readonly OneofAccessor<TMessage, TBuilder>[] oneofs;

 

         private readonly MessageDescriptor descriptor;

 

@@ -68,17 +69,28 @@ namespace Google.ProtocolBuffers.FieldAccess
         {

             this.descriptor = descriptor;

             accessors = new IFieldAccessor<TMessage, TBuilder>[descriptor.Fields.Count];

+            oneofs = new OneofAccessor<TMessage, TBuilder>[descriptor.Oneofs.Count];

             bool supportFieldPresence = descriptor.File.Syntax == FileDescriptor.ProtoSyntax.Proto2;

-            for (int i = 0; i < accessors.Length; i++)

+            int fieldSize = accessors.Length;

+            for (int i = 0; i < fieldSize; i++)

             {

-                accessors[i] = CreateAccessor(descriptor.Fields[i], propertyNames[i], supportFieldPresence);

+                FieldDescriptor field = descriptor.Fields[i];

+                string containingOneofName = (field.ContainingOneof != null) ? 

+                    propertyNames[fieldSize +field.ContainingOneof.Index] : null;

+                accessors[i] = CreateAccessor(

+                    field, propertyNames[i], containingOneofName, supportFieldPresence);

+            }

+            for (int i = 0; i < oneofs.Length; i++)

+            {

+                oneofs[i] = new OneofAccessor<TMessage, TBuilder>(descriptor, propertyNames[i + accessors.Length]);

             }

         }

 

         /// <summary>

         /// Creates an accessor for a single field

         /// </summary>   

-        private static IFieldAccessor<TMessage, TBuilder> CreateAccessor(FieldDescriptor field, string name, bool supportFieldPresence)

+        private static IFieldAccessor<TMessage, TBuilder> CreateAccessor(

+            FieldDescriptor field, string name, string containingOneofName, bool supportFieldPresence)

         {

             if (field.IsRepeated)

             {

@@ -97,11 +109,24 @@ namespace Google.ProtocolBuffers.FieldAccess
                 switch (field.MappedType)

                 {

                     case MappedType.Message:

-                        return new SingleMessageAccessor<TMessage, TBuilder>(name);

+                        {

+                            if (field.ContainingOneof != null)

+                            {

+                                return new SingleMessageAccessor<TMessage, TBuilder>(

+                                    field, name, containingOneofName, supportFieldPresence);

+                            }

+                            else

+                            {

+                                return new SingleMessageAccessor<TMessage, TBuilder>(

+                                    field, name, containingOneofName, true);

+                            }

+                        }

                     case MappedType.Enum:

-                        return new SingleEnumAccessor<TMessage, TBuilder>(field, name, supportFieldPresence);

+                        return new SingleEnumAccessor<TMessage, TBuilder>(

+                            field, name, containingOneofName, supportFieldPresence);

                     default:

-                        return new SinglePrimitiveAccessor<TMessage, TBuilder>(field, name, supportFieldPresence);

+                        return new SinglePrimitiveAccessor<TMessage, TBuilder>(

+                            field, name, containingOneofName, supportFieldPresence);

                 }

             }

         }

@@ -123,5 +148,14 @@ namespace Google.ProtocolBuffers.FieldAccess
                 return accessors[field.Index];

             }

         }

+

+        internal OneofAccessor<TMessage, TBuilder> Oneof(OneofDescriptor oneof)

+        {

+            if (oneof.ContainingType != descriptor)

+            {

+                throw new ArgumentException("OneofDescriptor does not match message type");

+            }

+            return oneofs[oneof.Index];

+        }

     }

 }
\ No newline at end of file
diff --git a/csharp/src/ProtocolBuffers/FieldAccess/OneofAccessor.cs b/csharp/src/ProtocolBuffers/FieldAccess/OneofAccessor.cs
new file mode 100644
index 00000000..1a4bda76
--- /dev/null
+++ b/csharp/src/ProtocolBuffers/FieldAccess/OneofAccessor.cs
@@ -0,0 +1,91 @@
+// Protocol Buffers - Google's data interchange format

+// Copyright 2015 Google Inc.  All rights reserved.

+// Author: jieluo@google.com (Jie Luo)

+//

+// Redistribution and use in source and binary forms, with or without

+// modification, are permitted provided that the following conditions are

+// met:

+//

+//     * Redistributions of source code must retain the above copyright

+// notice, this list of conditions and the following disclaimer.

+//     * Redistributions in binary form must reproduce the above

+// copyright notice, this list of conditions and the following disclaimer

+// in the documentation and/or other materials provided with the

+// distribution.

+//     * Neither the name of Google Inc. nor the names of its

+// contributors may be used to endorse or promote products derived from

+// this software without specific prior written permission.

+//

+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

+using System;

+using System.Reflection;

+using Google.ProtocolBuffers.Descriptors;

+

+namespace Google.ProtocolBuffers.FieldAccess

+{

+    /// <summary>

+    /// Access for an oneof

+    /// </summary>

+    internal class OneofAccessor<TMessage, TBuilder>

+        where TMessage : IMessage<TMessage, TBuilder>

+        where TBuilder : IBuilder<TMessage, TBuilder>

+    {

+        private readonly Func<TMessage, object> caseDelegate;

+        private readonly Func<TBuilder, IBuilder> clearDelegate;

+        private MessageDescriptor descriptor;

+

+        internal OneofAccessor(MessageDescriptor descriptor, string name) 

+        {

+            this.descriptor = descriptor;

+            MethodInfo clearMethod = typeof(TBuilder).GetMethod("Clear" + name);

+            PropertyInfo caseProperty = typeof(TMessage).GetProperty(name + "Case");

+            if (clearMethod == null || caseProperty == null)

+            {

+                throw new ArgumentException("Not all required properties/methods available for oneof");

+            }

+            

+

+            clearDelegate = ReflectionUtil.CreateDelegateFunc<TBuilder, IBuilder>(clearMethod);

+            caseDelegate = ReflectionUtil.CreateUpcastDelegate<TMessage>(caseProperty.GetGetMethod());

+        }

+

+        /// <summary>

+        /// Indicates whether the specified message has set any field in the oneof.

+        /// </summary>

+        public bool Has(TMessage message)

+        {

+            return ((int) caseDelegate(message) != 0);

+        }

+

+        /// <summary>

+        /// Clears the oneof in the specified builder.

+        /// </summary>

+        public void Clear(TBuilder builder)

+        {

+            clearDelegate(builder);

+        }

+

+        /// <summary>

+        /// Indicates which field in the oneof is set for specified message

+        /// </summary>

+        public virtual FieldDescriptor GetOneofFieldDescriptor(TMessage message)

+        {

+            int fieldNumber = (int) caseDelegate(message);

+            if (fieldNumber > 0)

+            {

+                return descriptor.FindFieldByNumber(fieldNumber);

+            }

+            return null;

+        }

+    }

+}

diff --git a/csharp/src/ProtocolBuffers/FieldAccess/SingleEnumAccessor.cs b/csharp/src/ProtocolBuffers/FieldAccess/SingleEnumAccessor.cs
index e63f717c..89e10179 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/SingleEnumAccessor.cs
+++ b/csharp/src/ProtocolBuffers/FieldAccess/SingleEnumAccessor.cs
@@ -42,7 +42,8 @@ namespace Google.ProtocolBuffers.FieldAccess
     {

         private readonly EnumDescriptor enumDescriptor;

 

-        internal SingleEnumAccessor(FieldDescriptor field, string name, bool supportFieldPresence) : base(field, name, supportFieldPresence)

+        internal SingleEnumAccessor(FieldDescriptor field, string name, string containingOneofName, bool supportFieldPresence)

+            : base(field, name, containingOneofName, supportFieldPresence)

         {

             enumDescriptor = field.EnumType;

         }

diff --git a/csharp/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs b/csharp/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs
index 0ec2b0b7..9068d40a 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs
+++ b/csharp/src/ProtocolBuffers/FieldAccess/SingleMessageAccessor.cs
@@ -31,6 +31,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 using System;

 using System.Reflection;

+using Google.ProtocolBuffers.Descriptors;

 

 namespace Google.ProtocolBuffers.FieldAccess

 {

@@ -48,7 +49,8 @@ namespace Google.ProtocolBuffers.FieldAccess
         /// </summary>

         private readonly Func<IBuilder> createBuilderDelegate;

 

-        internal SingleMessageAccessor(string name) : base(null, name, true)

+        internal SingleMessageAccessor(FieldDescriptor field, string name, string containingOneofName, bool supportFieldPresence)

+            : base(field, name, containingOneofName, supportFieldPresence)

         {

             MethodInfo createBuilderMethod = ClrType.GetMethod("CreateBuilder", ReflectionUtil.EmptyTypes);

             if (createBuilderMethod == null)

diff --git a/csharp/src/ProtocolBuffers/FieldAccess/SinglePrimitiveAccessor.cs b/csharp/src/ProtocolBuffers/FieldAccess/SinglePrimitiveAccessor.cs
index b9ab7293..035fcf3c 100644
--- a/csharp/src/ProtocolBuffers/FieldAccess/SinglePrimitiveAccessor.cs
+++ b/csharp/src/ProtocolBuffers/FieldAccess/SinglePrimitiveAccessor.cs
@@ -47,6 +47,7 @@ namespace Google.ProtocolBuffers.FieldAccess
         private readonly Action<TBuilder, object> setValueDelegate;

         private readonly Func<TMessage, bool> hasDelegate;

         private readonly Func<TBuilder, IBuilder> clearDelegate;

+        private readonly Func<TMessage, object> caseDelegate;

 

         /// <summary>

         /// The CLR type of the field (int, the enum type, ByteString, the message etc).

@@ -57,7 +58,8 @@ namespace Google.ProtocolBuffers.FieldAccess
             get { return clrType; }

         }

 

-        internal SinglePrimitiveAccessor(FieldDescriptor fieldDescriptor, string name, bool supportFieldPresence)

+        internal SinglePrimitiveAccessor(

+            FieldDescriptor fieldDescriptor, string name, string containingOneofName, bool supportFieldPresence)

         {

             PropertyInfo messageProperty = typeof(TMessage).GetProperty(name, null, ReflectionUtil.EmptyTypes);

             PropertyInfo builderProperty = typeof(TBuilder).GetProperty(name, null, ReflectionUtil.EmptyTypes);

@@ -77,7 +79,16 @@ namespace Google.ProtocolBuffers.FieldAccess
                 hasDelegate = ReflectionUtil.CreateDelegateFunc<TMessage, bool>(hasProperty.GetGetMethod());

             } else

             {

-                hasDelegate = message => !GetValue(message).Equals(fieldDescriptor.DefaultValue);

+                if (fieldDescriptor.ContainingOneof != null)

+                {

+                    PropertyInfo caseProperty = typeof(TMessage).GetProperty(containingOneofName + "Case");

+                    caseDelegate = ReflectionUtil.CreateUpcastDelegate<TMessage>(caseProperty.GetGetMethod());

+                    hasDelegate = message => OneofFieldNumber(message).Equals(fieldDescriptor.FieldNumber);

+                }

+                else

+                {

+                    hasDelegate = message => !GetValue(message).Equals(fieldDescriptor.DefaultValue);

+                }

             }

 

             clrType = messageProperty.PropertyType;

@@ -86,6 +97,11 @@ namespace Google.ProtocolBuffers.FieldAccess
             setValueDelegate = ReflectionUtil.CreateDowncastDelegate<TBuilder>(builderProperty.GetSetMethod());

         }

 

+        private int OneofFieldNumber(TMessage message)

+        {

+            return (int) caseDelegate(message);

+        }

+

         public bool Has(TMessage message)

         {

             return hasDelegate(message);

@@ -143,4 +159,4 @@ namespace Google.ProtocolBuffers.FieldAccess
 

         #endregion

     }

-}
\ No newline at end of file
+}

diff --git a/csharp/src/ProtocolBuffers/GeneratedBuilder.cs b/csharp/src/ProtocolBuffers/GeneratedBuilder.cs
index e60a4201..0f121ae8 100644
--- a/csharp/src/ProtocolBuffers/GeneratedBuilder.cs
+++ b/csharp/src/ProtocolBuffers/GeneratedBuilder.cs
@@ -105,6 +105,16 @@ namespace Google.ProtocolBuffers
             set { InternalFieldAccessors[field].SetRepeated(ThisBuilder, index, value); }

         }

 

+        public override bool HasOneof(OneofDescriptor oneof)

+        {

+            return MessageBeingBuilt.HasOneof(oneof);

+        }

+

+        public override FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof)

+        {

+            return MessageBeingBuilt.OneofFieldDescriptor(oneof);

+        }

+

         public override bool HasField(FieldDescriptor field)

         {

             return MessageBeingBuilt.HasField(field);

@@ -121,6 +131,12 @@ namespace Google.ProtocolBuffers
             return ThisBuilder;

         }

 

+        public override TBuilder ClearOneof(OneofDescriptor oneof)

+        {

+            InternalFieldAccessors.Oneof(oneof).Clear(ThisBuilder);

+            return ThisBuilder;

+        }

+

         public override TBuilder MergeFrom(TMessage other)

         {

             if (other.DescriptorForType != InternalFieldAccessors.Descriptor)

diff --git a/csharp/src/ProtocolBuffers/GeneratedMessage.cs b/csharp/src/ProtocolBuffers/GeneratedMessage.cs
index c17c15cf..ff3a0c2a 100644
--- a/csharp/src/ProtocolBuffers/GeneratedMessage.cs
+++ b/csharp/src/ProtocolBuffers/GeneratedMessage.cs
@@ -142,6 +142,16 @@ namespace Google.ProtocolBuffers
             get { return Dictionaries.AsReadOnly(GetMutableFieldMap()); }

         }

 

+        public override bool HasOneof(OneofDescriptor oneof)

+        {

+            return InternalFieldAccessors.Oneof(oneof).Has(ThisMessage);

+        }

+

+        public override FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof)

+        {

+            return InternalFieldAccessors.Oneof(oneof).GetOneofFieldDescriptor(ThisMessage);

+        }

+

         public override bool HasField(FieldDescriptor field)

         {

             return InternalFieldAccessors[field].Has(ThisMessage);

diff --git a/csharp/src/ProtocolBuffers/IBuilder.cs b/csharp/src/ProtocolBuffers/IBuilder.cs
index f9c0df61..e765464a 100644
--- a/csharp/src/ProtocolBuffers/IBuilder.cs
+++ b/csharp/src/ProtocolBuffers/IBuilder.cs
@@ -103,6 +103,11 @@ namespace Google.ProtocolBuffers
         /// </summary>

         object this[FieldDescriptor field, int index] { get; set; }

 

+

+        bool HasOneof(OneofDescriptor oneof);

+

+        FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof);

+        

         /// <summary>

         /// <see cref="IMessage{TMessage, TBuilder}.HasField"/>

         /// </summary>

@@ -125,6 +130,7 @@ namespace Google.ProtocolBuffers
         IBuilder WeakAddRepeatedField(FieldDescriptor field, object value);

         new IBuilder WeakClear();

         IBuilder WeakClearField(FieldDescriptor field);

+        IBuilder WeakClearOneof(OneofDescriptor oneof);

         IBuilder WeakMergeFrom(IMessage message);

         new IBuilder WeakMergeFrom(ByteString data);

         new IBuilder WeakMergeFrom(ByteString data, ExtensionRegistry registry);

@@ -228,6 +234,14 @@ namespace Google.ProtocolBuffers
         TBuilder ClearField(FieldDescriptor field);

 

         /// <summary>

+        /// Clears the oneof. This is exactly equivalent to calling the generated

+        /// Clear method corresponding to the oneof.

+        /// </summary>

+        /// <param name="oneof"></param>

+        /// <returns></returns>

+        TBuilder ClearOneof(OneofDescriptor oneof);

+

+        /// <summary>

         /// Appends the given value as a new element for the specified repeated field.

         /// </summary>

         /// <exception cref="ArgumentException">the field is not a repeated field,

diff --git a/csharp/src/ProtocolBuffers/IMessage.cs b/csharp/src/ProtocolBuffers/IMessage.cs
index c23bc3f7..dd309d4e 100644
--- a/csharp/src/ProtocolBuffers/IMessage.cs
+++ b/csharp/src/ProtocolBuffers/IMessage.cs
@@ -67,6 +67,10 @@ namespace Google.ProtocolBuffers
         /// </summary>

         IDictionary<FieldDescriptor, object> AllFields { get; }

 

+        bool HasOneof(OneofDescriptor oneof);

+

+        FieldDescriptor OneofFieldDescriptor(OneofDescriptor oneof);

+

         /// <summary>

         /// Returns true if the given field is set. This is exactly equivalent

         /// to calling the generated "Has" property corresponding to the field.

diff --git a/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj b/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj
index 32a343ad..7dc8f665 100644
--- a/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj
+++ b/csharp/src/ProtocolBuffers/ProtocolBuffers.csproj
@@ -81,6 +81,7 @@
     <Compile Include="Descriptors\FieldMappingAttribute.cs" />

     <Compile Include="Descriptors\FieldType.cs" />

     <Compile Include="Descriptors\FileDescriptor.cs" />

+    <Compile Include="Descriptors\OneofDescriptor.cs" />

     <Compile Include="Descriptors\IDescriptor.cs" />

     <Compile Include="Descriptors\IndexedDescriptorBase.cs" />

     <Compile Include="Descriptors\MappedType.cs" />

@@ -106,6 +107,7 @@
     <Compile Include="FieldAccess\IFieldAccessor.cs" />

     <Compile Include="FieldAccess\FieldAccessorTable.cs" />

     <Compile Include="FieldAccess\RepeatedMessageAccessor.cs" />

+    <Compile Include="FieldAccess\OneofAccessor.cs" />

     <Compile Include="FieldSet.cs" />

     <Compile Include="FrameworkPortability.cs" />

     <Compile Include="GeneratedBuilder.cs" />

@@ -146,4 +148,4 @@
   <Target Name="AfterBuild">

   </Target>

   -->

-</Project>
\ No newline at end of file
+</Project>

diff --git a/csharp/src/ProtocolBuffersLite.Test/TestProtos/Unittest.cs b/csharp/src/ProtocolBuffersLite.Test/TestProtos/Unittest.cs
index 083523c0..67898644 100644
--- a/csharp/src/ProtocolBuffersLite.Test/TestProtos/Unittest.cs
+++ b/csharp/src/ProtocolBuffersLite.Test/TestProtos/Unittest.cs
@@ -355,6 +355,8 @@ namespace Google.ProtocolBuffers.TestProtos {
     internal static pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDeprecatedFields, global::Google.ProtocolBuffers.TestProtos.TestDeprecatedFields.Builder> internal__static_protobuf_unittest_TestDeprecatedFields__FieldAccessorTable;
     internal static pbd::MessageDescriptor internal__static_protobuf_unittest_ForeignMessage__Descriptor;
     internal static pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.ForeignMessage, global::Google.ProtocolBuffers.TestProtos.ForeignMessage.Builder> internal__static_protobuf_unittest_ForeignMessage__FieldAccessorTable;
+    internal static pbd::MessageDescriptor internal__static_protobuf_unittest_TestReservedFields__Descriptor;
+    internal static pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestReservedFields, global::Google.ProtocolBuffers.TestProtos.TestReservedFields.Builder> internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable;
     internal static pbd::MessageDescriptor internal__static_protobuf_unittest_TestAllExtensions__Descriptor;
     internal static pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestAllExtensions, global::Google.ProtocolBuffers.TestProtos.TestAllExtensions.Builder> internal__static_protobuf_unittest_TestAllExtensions__FieldAccessorTable;
     internal static pbd::MessageDescriptor internal__static_protobuf_unittest_OptionalGroup_extension__Descriptor;
@@ -565,426 +567,429 @@ namespace Google.ProtocolBuffers.TestProtos {
             "ZXMYciABKAxIABobCg1OZXN0ZWRNZXNzYWdlEgoKAmJiGAEgASgFGhoKDU9w", 
             "dGlvbmFsR3JvdXASCQoBYRgRIAEoBRoaCg1SZXBlYXRlZEdyb3VwEgkKAWEY", 
             "LyABKAUiOQoKTmVzdGVkRW51bRIHCgNGT08QARIHCgNCQVIQAhIHCgNCQVoQ", 
-            "AxIQCgNORUcQ////////////AUINCgtvbmVvZl9maWVsZCJ8ChJOZXN0ZWRU", 
-            "ZXN0QWxsVHlwZXMSNAoFY2hpbGQYASABKAsyJS5wcm90b2J1Zl91bml0dGVz", 
-            "dC5OZXN0ZWRUZXN0QWxsVHlwZXMSMAoHcGF5bG9hZBgCIAEoCzIfLnByb3Rv", 
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-          "b2dsZS5Qcm90b2NvbEJ1ZmZlcnMuVGVzdFByb3Rvcw=="));
+            "cxhmIAMoCEICEAA6bgoXdW5wYWNrZWRfZW51bV9leHRlbnNpb24SKS5wcm90", 
+            "b2J1Zl91bml0dGVzdC5UZXN0VW5wYWNrZWRFeHRlbnNpb25zGGcgAygOMh4u", 
+            "cHJvdG9idWZfdW5pdHRlc3QuRm9yZWlnbkVudW1CAhAAQkFCDVVuaXR0ZXN0", 
+            "UHJvdG9IAYABAYgBAZABAfgBAaoCIUdvb2dsZS5Qcm90b2NvbEJ1ZmZlcnMu", 
+          "VGVzdFByb3Rvcw=="));
       pbd::FileDescriptor.InternalDescriptorAssigner assigner = delegate(pbd::FileDescriptor root) {
         descriptor = root;
         internal__static_protobuf_unittest_TestAllTypes__Descriptor = Descriptor.MessageTypes[0];
         internal__static_protobuf_unittest_TestAllTypes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestAllTypes, global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Builder>(internal__static_protobuf_unittest_TestAllTypes__Descriptor,
-                new string[] { "OptionalInt32", "OptionalInt64", "OptionalUint32", "OptionalUint64", "OptionalSint32", "OptionalSint64", "OptionalFixed32", "OptionalFixed64", "OptionalSfixed32", "OptionalSfixed64", "OptionalFloat", "OptionalDouble", "OptionalBool", "OptionalString", "OptionalBytes", "OptionalGroup", "OptionalNestedMessage", "OptionalForeignMessage", "OptionalImportMessage", "OptionalNestedEnum", "OptionalForeignEnum", "OptionalImportEnum", "OptionalStringPiece", "OptionalCord", "OptionalPublicImportMessage", "OptionalLazyMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedGroup", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedImportMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedImportEnum", "RepeatedStringPiece", "RepeatedCord", "RepeatedLazyMessage", "DefaultInt32", "DefaultInt64", "DefaultUint32", "DefaultUint64", "DefaultSint32", "DefaultSint64", "DefaultFixed32", "DefaultFixed64", "DefaultSfixed32", "DefaultSfixed64", "DefaultFloat", "DefaultDouble", "DefaultBool", "DefaultString", "DefaultBytes", "DefaultNestedEnum", "DefaultForeignEnum", "DefaultImportEnum", "DefaultStringPiece", "DefaultCord", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes", });
+                new string[] { "OptionalInt32", "OptionalInt64", "OptionalUint32", "OptionalUint64", "OptionalSint32", "OptionalSint64", "OptionalFixed32", "OptionalFixed64", "OptionalSfixed32", "OptionalSfixed64", "OptionalFloat", "OptionalDouble", "OptionalBool", "OptionalString", "OptionalBytes", "OptionalGroup", "OptionalNestedMessage", "OptionalForeignMessage", "OptionalImportMessage", "OptionalNestedEnum", "OptionalForeignEnum", "OptionalImportEnum", "OptionalStringPiece", "OptionalCord", "OptionalPublicImportMessage", "OptionalLazyMessage", "RepeatedInt32", "RepeatedInt64", "RepeatedUint32", "RepeatedUint64", "RepeatedSint32", "RepeatedSint64", "RepeatedFixed32", "RepeatedFixed64", "RepeatedSfixed32", "RepeatedSfixed64", "RepeatedFloat", "RepeatedDouble", "RepeatedBool", "RepeatedString", "RepeatedBytes", "RepeatedGroup", "RepeatedNestedMessage", "RepeatedForeignMessage", "RepeatedImportMessage", "RepeatedNestedEnum", "RepeatedForeignEnum", "RepeatedImportEnum", "RepeatedStringPiece", "RepeatedCord", "RepeatedLazyMessage", "DefaultInt32", "DefaultInt64", "DefaultUint32", "DefaultUint64", "DefaultSint32", "DefaultSint64", "DefaultFixed32", "DefaultFixed64", "DefaultSfixed32", "DefaultSfixed64", "DefaultFloat", "DefaultDouble", "DefaultBool", "DefaultString", "DefaultBytes", "DefaultNestedEnum", "DefaultForeignEnum", "DefaultImportEnum", "DefaultStringPiece", "DefaultCord", "OneofUint32", "OneofNestedMessage", "OneofString", "OneofBytes", "OneofField", });
         internal__static_protobuf_unittest_TestAllTypes_NestedMessage__Descriptor = internal__static_protobuf_unittest_TestAllTypes__Descriptor.NestedTypes[0];
         internal__static_protobuf_unittest_TestAllTypes_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestAllTypes_NestedMessage__Descriptor,
@@ -1000,7 +1005,7 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_NestedTestAllTypes__Descriptor = Descriptor.MessageTypes[1];
         internal__static_protobuf_unittest_NestedTestAllTypes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes, global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes.Builder>(internal__static_protobuf_unittest_NestedTestAllTypes__Descriptor,
-                new string[] { "Child", "Payload", });
+                new string[] { "Child", "Payload", "RepeatedChild", });
         internal__static_protobuf_unittest_TestDeprecatedFields__Descriptor = Descriptor.MessageTypes[2];
         internal__static_protobuf_unittest_TestDeprecatedFields__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDeprecatedFields, global::Google.ProtocolBuffers.TestProtos.TestDeprecatedFields.Builder>(internal__static_protobuf_unittest_TestDeprecatedFields__Descriptor,
@@ -1009,67 +1014,71 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_ForeignMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.ForeignMessage, global::Google.ProtocolBuffers.TestProtos.ForeignMessage.Builder>(internal__static_protobuf_unittest_ForeignMessage__Descriptor,
                 new string[] { "C", });
-        internal__static_protobuf_unittest_TestAllExtensions__Descriptor = Descriptor.MessageTypes[4];
+        internal__static_protobuf_unittest_TestReservedFields__Descriptor = Descriptor.MessageTypes[4];
+        internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable = 
+            new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestReservedFields, global::Google.ProtocolBuffers.TestProtos.TestReservedFields.Builder>(internal__static_protobuf_unittest_TestReservedFields__Descriptor,
+                new string[] { });
+        internal__static_protobuf_unittest_TestAllExtensions__Descriptor = Descriptor.MessageTypes[5];
         internal__static_protobuf_unittest_TestAllExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestAllExtensions, global::Google.ProtocolBuffers.TestProtos.TestAllExtensions.Builder>(internal__static_protobuf_unittest_TestAllExtensions__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_OptionalGroup_extension__Descriptor = Descriptor.MessageTypes[5];
+        internal__static_protobuf_unittest_OptionalGroup_extension__Descriptor = Descriptor.MessageTypes[6];
         internal__static_protobuf_unittest_OptionalGroup_extension__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.OptionalGroup_extension, global::Google.ProtocolBuffers.TestProtos.OptionalGroup_extension.Builder>(internal__static_protobuf_unittest_OptionalGroup_extension__Descriptor,
                 new string[] { "A", });
-        internal__static_protobuf_unittest_RepeatedGroup_extension__Descriptor = Descriptor.MessageTypes[6];
+        internal__static_protobuf_unittest_RepeatedGroup_extension__Descriptor = Descriptor.MessageTypes[7];
         internal__static_protobuf_unittest_RepeatedGroup_extension__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.RepeatedGroup_extension, global::Google.ProtocolBuffers.TestProtos.RepeatedGroup_extension.Builder>(internal__static_protobuf_unittest_RepeatedGroup_extension__Descriptor,
                 new string[] { "A", });
-        internal__static_protobuf_unittest_TestNestedExtension__Descriptor = Descriptor.MessageTypes[7];
+        internal__static_protobuf_unittest_TestNestedExtension__Descriptor = Descriptor.MessageTypes[8];
         internal__static_protobuf_unittest_TestNestedExtension__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestNestedExtension, global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.Builder>(internal__static_protobuf_unittest_TestNestedExtension__Descriptor,
                 new string[] { });
         global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.Test = pb::GeneratedSingleExtension<string>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.Descriptor.Extensions[0]);
         global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.NestedStringExtension = pb::GeneratedSingleExtension<string>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestNestedExtension.Descriptor.Extensions[1]);
-        internal__static_protobuf_unittest_TestRequired__Descriptor = Descriptor.MessageTypes[8];
+        internal__static_protobuf_unittest_TestRequired__Descriptor = Descriptor.MessageTypes[9];
         internal__static_protobuf_unittest_TestRequired__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRequired, global::Google.ProtocolBuffers.TestProtos.TestRequired.Builder>(internal__static_protobuf_unittest_TestRequired__Descriptor,
                 new string[] { "A", "Dummy2", "B", "Dummy4", "Dummy5", "Dummy6", "Dummy7", "Dummy8", "Dummy9", "Dummy10", "Dummy11", "Dummy12", "Dummy13", "Dummy14", "Dummy15", "Dummy16", "Dummy17", "Dummy18", "Dummy19", "Dummy20", "Dummy21", "Dummy22", "Dummy23", "Dummy24", "Dummy25", "Dummy26", "Dummy27", "Dummy28", "Dummy29", "Dummy30", "Dummy31", "Dummy32", "C", });
         global::Google.ProtocolBuffers.TestProtos.TestRequired.Single = pb::GeneratedSingleExtension<global::Google.ProtocolBuffers.TestProtos.TestRequired>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestRequired.Descriptor.Extensions[0]);
         global::Google.ProtocolBuffers.TestProtos.TestRequired.Multi = pb::GeneratedRepeatExtension<global::Google.ProtocolBuffers.TestProtos.TestRequired>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestRequired.Descriptor.Extensions[1]);
-        internal__static_protobuf_unittest_TestRequiredForeign__Descriptor = Descriptor.MessageTypes[9];
+        internal__static_protobuf_unittest_TestRequiredForeign__Descriptor = Descriptor.MessageTypes[10];
         internal__static_protobuf_unittest_TestRequiredForeign__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRequiredForeign, global::Google.ProtocolBuffers.TestProtos.TestRequiredForeign.Builder>(internal__static_protobuf_unittest_TestRequiredForeign__Descriptor,
                 new string[] { "OptionalMessage", "RepeatedMessage", "Dummy", });
-        internal__static_protobuf_unittest_TestForeignNested__Descriptor = Descriptor.MessageTypes[10];
+        internal__static_protobuf_unittest_TestForeignNested__Descriptor = Descriptor.MessageTypes[11];
         internal__static_protobuf_unittest_TestForeignNested__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestForeignNested, global::Google.ProtocolBuffers.TestProtos.TestForeignNested.Builder>(internal__static_protobuf_unittest_TestForeignNested__Descriptor,
                 new string[] { "ForeignNested", });
-        internal__static_protobuf_unittest_TestEmptyMessage__Descriptor = Descriptor.MessageTypes[11];
+        internal__static_protobuf_unittest_TestEmptyMessage__Descriptor = Descriptor.MessageTypes[12];
         internal__static_protobuf_unittest_TestEmptyMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestEmptyMessage, global::Google.ProtocolBuffers.TestProtos.TestEmptyMessage.Builder>(internal__static_protobuf_unittest_TestEmptyMessage__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestEmptyMessageWithExtensions__Descriptor = Descriptor.MessageTypes[12];
+        internal__static_protobuf_unittest_TestEmptyMessageWithExtensions__Descriptor = Descriptor.MessageTypes[13];
         internal__static_protobuf_unittest_TestEmptyMessageWithExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestEmptyMessageWithExtensions, global::Google.ProtocolBuffers.TestProtos.TestEmptyMessageWithExtensions.Builder>(internal__static_protobuf_unittest_TestEmptyMessageWithExtensions__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestMultipleExtensionRanges__Descriptor = Descriptor.MessageTypes[13];
+        internal__static_protobuf_unittest_TestMultipleExtensionRanges__Descriptor = Descriptor.MessageTypes[14];
         internal__static_protobuf_unittest_TestMultipleExtensionRanges__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestMultipleExtensionRanges, global::Google.ProtocolBuffers.TestProtos.TestMultipleExtensionRanges.Builder>(internal__static_protobuf_unittest_TestMultipleExtensionRanges__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestReallyLargeTagNumber__Descriptor = Descriptor.MessageTypes[14];
+        internal__static_protobuf_unittest_TestReallyLargeTagNumber__Descriptor = Descriptor.MessageTypes[15];
         internal__static_protobuf_unittest_TestReallyLargeTagNumber__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestReallyLargeTagNumber, global::Google.ProtocolBuffers.TestProtos.TestReallyLargeTagNumber.Builder>(internal__static_protobuf_unittest_TestReallyLargeTagNumber__Descriptor,
                 new string[] { "A", "Bb", });
-        internal__static_protobuf_unittest_TestRecursiveMessage__Descriptor = Descriptor.MessageTypes[15];
+        internal__static_protobuf_unittest_TestRecursiveMessage__Descriptor = Descriptor.MessageTypes[16];
         internal__static_protobuf_unittest_TestRecursiveMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRecursiveMessage, global::Google.ProtocolBuffers.TestProtos.TestRecursiveMessage.Builder>(internal__static_protobuf_unittest_TestRecursiveMessage__Descriptor,
                 new string[] { "A", "I", });
-        internal__static_protobuf_unittest_TestMutualRecursionA__Descriptor = Descriptor.MessageTypes[16];
+        internal__static_protobuf_unittest_TestMutualRecursionA__Descriptor = Descriptor.MessageTypes[17];
         internal__static_protobuf_unittest_TestMutualRecursionA__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestMutualRecursionA, global::Google.ProtocolBuffers.TestProtos.TestMutualRecursionA.Builder>(internal__static_protobuf_unittest_TestMutualRecursionA__Descriptor,
                 new string[] { "Bb", });
-        internal__static_protobuf_unittest_TestMutualRecursionB__Descriptor = Descriptor.MessageTypes[17];
+        internal__static_protobuf_unittest_TestMutualRecursionB__Descriptor = Descriptor.MessageTypes[18];
         internal__static_protobuf_unittest_TestMutualRecursionB__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestMutualRecursionB, global::Google.ProtocolBuffers.TestProtos.TestMutualRecursionB.Builder>(internal__static_protobuf_unittest_TestMutualRecursionB__Descriptor,
                 new string[] { "A", "OptionalInt32", });
-        internal__static_protobuf_unittest_TestDupFieldNumber__Descriptor = Descriptor.MessageTypes[18];
+        internal__static_protobuf_unittest_TestDupFieldNumber__Descriptor = Descriptor.MessageTypes[19];
         internal__static_protobuf_unittest_TestDupFieldNumber__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDupFieldNumber, global::Google.ProtocolBuffers.TestProtos.TestDupFieldNumber.Builder>(internal__static_protobuf_unittest_TestDupFieldNumber__Descriptor,
                 new string[] { "A", "Foo", "Bar", });
@@ -1081,15 +1090,15 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestDupFieldNumber_Bar__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDupFieldNumber.Types.Bar, global::Google.ProtocolBuffers.TestProtos.TestDupFieldNumber.Types.Bar.Builder>(internal__static_protobuf_unittest_TestDupFieldNumber_Bar__Descriptor,
                 new string[] { "A", });
-        internal__static_protobuf_unittest_TestEagerMessage__Descriptor = Descriptor.MessageTypes[19];
+        internal__static_protobuf_unittest_TestEagerMessage__Descriptor = Descriptor.MessageTypes[20];
         internal__static_protobuf_unittest_TestEagerMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestEagerMessage, global::Google.ProtocolBuffers.TestProtos.TestEagerMessage.Builder>(internal__static_protobuf_unittest_TestEagerMessage__Descriptor,
                 new string[] { "SubMessage", });
-        internal__static_protobuf_unittest_TestLazyMessage__Descriptor = Descriptor.MessageTypes[20];
+        internal__static_protobuf_unittest_TestLazyMessage__Descriptor = Descriptor.MessageTypes[21];
         internal__static_protobuf_unittest_TestLazyMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestLazyMessage, global::Google.ProtocolBuffers.TestProtos.TestLazyMessage.Builder>(internal__static_protobuf_unittest_TestLazyMessage__Descriptor,
                 new string[] { "SubMessage", });
-        internal__static_protobuf_unittest_TestNestedMessageHasBits__Descriptor = Descriptor.MessageTypes[21];
+        internal__static_protobuf_unittest_TestNestedMessageHasBits__Descriptor = Descriptor.MessageTypes[22];
         internal__static_protobuf_unittest_TestNestedMessageHasBits__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestNestedMessageHasBits, global::Google.ProtocolBuffers.TestProtos.TestNestedMessageHasBits.Builder>(internal__static_protobuf_unittest_TestNestedMessageHasBits__Descriptor,
                 new string[] { "OptionalNestedMessage", });
@@ -1097,11 +1106,11 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestNestedMessageHasBits_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestNestedMessageHasBits.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestNestedMessageHasBits.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestNestedMessageHasBits_NestedMessage__Descriptor,
                 new string[] { "NestedmessageRepeatedInt32", "NestedmessageRepeatedForeignmessage", });
-        internal__static_protobuf_unittest_TestCamelCaseFieldNames__Descriptor = Descriptor.MessageTypes[22];
+        internal__static_protobuf_unittest_TestCamelCaseFieldNames__Descriptor = Descriptor.MessageTypes[23];
         internal__static_protobuf_unittest_TestCamelCaseFieldNames__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestCamelCaseFieldNames, global::Google.ProtocolBuffers.TestProtos.TestCamelCaseFieldNames.Builder>(internal__static_protobuf_unittest_TestCamelCaseFieldNames__Descriptor,
                 new string[] { "PrimitiveField", "StringField", "EnumField", "MessageField", "StringPieceField", "CordField", "RepeatedPrimitiveField", "RepeatedStringField", "RepeatedEnumField", "RepeatedMessageField", "RepeatedStringPieceField", "RepeatedCordField", });
-        internal__static_protobuf_unittest_TestFieldOrderings__Descriptor = Descriptor.MessageTypes[23];
+        internal__static_protobuf_unittest_TestFieldOrderings__Descriptor = Descriptor.MessageTypes[24];
         internal__static_protobuf_unittest_TestFieldOrderings__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestFieldOrderings, global::Google.ProtocolBuffers.TestProtos.TestFieldOrderings.Builder>(internal__static_protobuf_unittest_TestFieldOrderings__Descriptor,
                 new string[] { "MyString", "MyInt", "MyFloat", "OptionalNestedMessage", });
@@ -1109,59 +1118,59 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestFieldOrderings_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestFieldOrderings.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestFieldOrderings.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestFieldOrderings_NestedMessage__Descriptor,
                 new string[] { "Oo", "Bb", });
-        internal__static_protobuf_unittest_TestExtremeDefaultValues__Descriptor = Descriptor.MessageTypes[24];
+        internal__static_protobuf_unittest_TestExtremeDefaultValues__Descriptor = Descriptor.MessageTypes[25];
         internal__static_protobuf_unittest_TestExtremeDefaultValues__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestExtremeDefaultValues, global::Google.ProtocolBuffers.TestProtos.TestExtremeDefaultValues.Builder>(internal__static_protobuf_unittest_TestExtremeDefaultValues__Descriptor,
                 new string[] { "EscapedBytes", "LargeUint32", "LargeUint64", "SmallInt32", "SmallInt64", "ReallySmallInt32", "ReallySmallInt64", "Utf8String", "ZeroFloat", "OneFloat", "SmallFloat", "NegativeOneFloat", "NegativeFloat", "LargeFloat", "SmallNegativeFloat", "InfDouble", "NegInfDouble", "NanDouble", "InfFloat", "NegInfFloat", "NanFloat", "CppTrigraph", "StringWithZero", "BytesWithZero", "StringPieceWithZero", "CordWithZero", "ReplacementString", });
-        internal__static_protobuf_unittest_SparseEnumMessage__Descriptor = Descriptor.MessageTypes[25];
+        internal__static_protobuf_unittest_SparseEnumMessage__Descriptor = Descriptor.MessageTypes[26];
         internal__static_protobuf_unittest_SparseEnumMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.SparseEnumMessage, global::Google.ProtocolBuffers.TestProtos.SparseEnumMessage.Builder>(internal__static_protobuf_unittest_SparseEnumMessage__Descriptor,
                 new string[] { "SparseEnum", });
-        internal__static_protobuf_unittest_OneString__Descriptor = Descriptor.MessageTypes[26];
+        internal__static_protobuf_unittest_OneString__Descriptor = Descriptor.MessageTypes[27];
         internal__static_protobuf_unittest_OneString__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.OneString, global::Google.ProtocolBuffers.TestProtos.OneString.Builder>(internal__static_protobuf_unittest_OneString__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_MoreString__Descriptor = Descriptor.MessageTypes[27];
+        internal__static_protobuf_unittest_MoreString__Descriptor = Descriptor.MessageTypes[28];
         internal__static_protobuf_unittest_MoreString__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.MoreString, global::Google.ProtocolBuffers.TestProtos.MoreString.Builder>(internal__static_protobuf_unittest_MoreString__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_OneBytes__Descriptor = Descriptor.MessageTypes[28];
+        internal__static_protobuf_unittest_OneBytes__Descriptor = Descriptor.MessageTypes[29];
         internal__static_protobuf_unittest_OneBytes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.OneBytes, global::Google.ProtocolBuffers.TestProtos.OneBytes.Builder>(internal__static_protobuf_unittest_OneBytes__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_MoreBytes__Descriptor = Descriptor.MessageTypes[29];
+        internal__static_protobuf_unittest_MoreBytes__Descriptor = Descriptor.MessageTypes[30];
         internal__static_protobuf_unittest_MoreBytes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.MoreBytes, global::Google.ProtocolBuffers.TestProtos.MoreBytes.Builder>(internal__static_protobuf_unittest_MoreBytes__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_Int32Message__Descriptor = Descriptor.MessageTypes[30];
+        internal__static_protobuf_unittest_Int32Message__Descriptor = Descriptor.MessageTypes[31];
         internal__static_protobuf_unittest_Int32Message__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Int32Message, global::Google.ProtocolBuffers.TestProtos.Int32Message.Builder>(internal__static_protobuf_unittest_Int32Message__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_Uint32Message__Descriptor = Descriptor.MessageTypes[31];
+        internal__static_protobuf_unittest_Uint32Message__Descriptor = Descriptor.MessageTypes[32];
         internal__static_protobuf_unittest_Uint32Message__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Uint32Message, global::Google.ProtocolBuffers.TestProtos.Uint32Message.Builder>(internal__static_protobuf_unittest_Uint32Message__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_Int64Message__Descriptor = Descriptor.MessageTypes[32];
+        internal__static_protobuf_unittest_Int64Message__Descriptor = Descriptor.MessageTypes[33];
         internal__static_protobuf_unittest_Int64Message__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Int64Message, global::Google.ProtocolBuffers.TestProtos.Int64Message.Builder>(internal__static_protobuf_unittest_Int64Message__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_Uint64Message__Descriptor = Descriptor.MessageTypes[33];
+        internal__static_protobuf_unittest_Uint64Message__Descriptor = Descriptor.MessageTypes[34];
         internal__static_protobuf_unittest_Uint64Message__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.Uint64Message, global::Google.ProtocolBuffers.TestProtos.Uint64Message.Builder>(internal__static_protobuf_unittest_Uint64Message__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_BoolMessage__Descriptor = Descriptor.MessageTypes[34];
+        internal__static_protobuf_unittest_BoolMessage__Descriptor = Descriptor.MessageTypes[35];
         internal__static_protobuf_unittest_BoolMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.BoolMessage, global::Google.ProtocolBuffers.TestProtos.BoolMessage.Builder>(internal__static_protobuf_unittest_BoolMessage__Descriptor,
                 new string[] { "Data", });
-        internal__static_protobuf_unittest_TestOneof__Descriptor = Descriptor.MessageTypes[35];
+        internal__static_protobuf_unittest_TestOneof__Descriptor = Descriptor.MessageTypes[36];
         internal__static_protobuf_unittest_TestOneof__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof, global::Google.ProtocolBuffers.TestProtos.TestOneof.Builder>(internal__static_protobuf_unittest_TestOneof__Descriptor,
-                new string[] { "FooInt", "FooString", "FooMessage", "FooGroup", });
+                new string[] { "FooInt", "FooString", "FooMessage", "FooGroup", "Foo", });
         internal__static_protobuf_unittest_TestOneof_FooGroup__Descriptor = internal__static_protobuf_unittest_TestOneof__Descriptor.NestedTypes[0];
         internal__static_protobuf_unittest_TestOneof_FooGroup__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup, global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.Builder>(internal__static_protobuf_unittest_TestOneof_FooGroup__Descriptor,
                 new string[] { "A", "B", });
-        internal__static_protobuf_unittest_TestOneofBackwardsCompatible__Descriptor = Descriptor.MessageTypes[36];
+        internal__static_protobuf_unittest_TestOneofBackwardsCompatible__Descriptor = Descriptor.MessageTypes[37];
         internal__static_protobuf_unittest_TestOneofBackwardsCompatible__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneofBackwardsCompatible, global::Google.ProtocolBuffers.TestProtos.TestOneofBackwardsCompatible.Builder>(internal__static_protobuf_unittest_TestOneofBackwardsCompatible__Descriptor,
                 new string[] { "FooInt", "FooString", "FooMessage", "FooGroup", });
@@ -1169,10 +1178,10 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestOneofBackwardsCompatible_FooGroup__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneofBackwardsCompatible.Types.FooGroup, global::Google.ProtocolBuffers.TestProtos.TestOneofBackwardsCompatible.Types.FooGroup.Builder>(internal__static_protobuf_unittest_TestOneofBackwardsCompatible_FooGroup__Descriptor,
                 new string[] { "A", "B", });
-        internal__static_protobuf_unittest_TestOneof2__Descriptor = Descriptor.MessageTypes[37];
+        internal__static_protobuf_unittest_TestOneof2__Descriptor = Descriptor.MessageTypes[38];
         internal__static_protobuf_unittest_TestOneof2__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof2, global::Google.ProtocolBuffers.TestProtos.TestOneof2.Builder>(internal__static_protobuf_unittest_TestOneof2__Descriptor,
-                new string[] { "FooInt", "FooString", "FooCord", "FooStringPiece", "FooBytes", "FooEnum", "FooMessage", "FooGroup", "FooLazyMessage", "BarInt", "BarString", "BarCord", "BarStringPiece", "BarBytes", "BarEnum", "BazInt", "BazString", });
+                new string[] { "FooInt", "FooString", "FooCord", "FooStringPiece", "FooBytes", "FooEnum", "FooMessage", "FooGroup", "FooLazyMessage", "BarInt", "BarString", "BarCord", "BarStringPiece", "BarBytes", "BarEnum", "BazInt", "BazString", "Foo", "Bar", });
         internal__static_protobuf_unittest_TestOneof2_FooGroup__Descriptor = internal__static_protobuf_unittest_TestOneof2__Descriptor.NestedTypes[0];
         internal__static_protobuf_unittest_TestOneof2_FooGroup__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup, global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.Builder>(internal__static_protobuf_unittest_TestOneof2_FooGroup__Descriptor,
@@ -1181,31 +1190,31 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestOneof2_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestOneof2_NestedMessage__Descriptor,
                 new string[] { "QuxInt", "CorgeInt", });
-        internal__static_protobuf_unittest_TestRequiredOneof__Descriptor = Descriptor.MessageTypes[38];
+        internal__static_protobuf_unittest_TestRequiredOneof__Descriptor = Descriptor.MessageTypes[39];
         internal__static_protobuf_unittest_TestRequiredOneof__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof, global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Builder>(internal__static_protobuf_unittest_TestRequiredOneof__Descriptor,
-                new string[] { "FooInt", "FooString", "FooMessage", });
+                new string[] { "FooInt", "FooString", "FooMessage", "Foo", });
         internal__static_protobuf_unittest_TestRequiredOneof_NestedMessage__Descriptor = internal__static_protobuf_unittest_TestRequiredOneof__Descriptor.NestedTypes[0];
         internal__static_protobuf_unittest_TestRequiredOneof_NestedMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage, global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.Builder>(internal__static_protobuf_unittest_TestRequiredOneof_NestedMessage__Descriptor,
                 new string[] { "RequiredDouble", });
-        internal__static_protobuf_unittest_TestPackedTypes__Descriptor = Descriptor.MessageTypes[39];
+        internal__static_protobuf_unittest_TestPackedTypes__Descriptor = Descriptor.MessageTypes[40];
         internal__static_protobuf_unittest_TestPackedTypes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestPackedTypes, global::Google.ProtocolBuffers.TestProtos.TestPackedTypes.Builder>(internal__static_protobuf_unittest_TestPackedTypes__Descriptor,
                 new string[] { "PackedInt32", "PackedInt64", "PackedUint32", "PackedUint64", "PackedSint32", "PackedSint64", "PackedFixed32", "PackedFixed64", "PackedSfixed32", "PackedSfixed64", "PackedFloat", "PackedDouble", "PackedBool", "PackedEnum", });
-        internal__static_protobuf_unittest_TestUnpackedTypes__Descriptor = Descriptor.MessageTypes[40];
+        internal__static_protobuf_unittest_TestUnpackedTypes__Descriptor = Descriptor.MessageTypes[41];
         internal__static_protobuf_unittest_TestUnpackedTypes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestUnpackedTypes, global::Google.ProtocolBuffers.TestProtos.TestUnpackedTypes.Builder>(internal__static_protobuf_unittest_TestUnpackedTypes__Descriptor,
                 new string[] { "UnpackedInt32", "UnpackedInt64", "UnpackedUint32", "UnpackedUint64", "UnpackedSint32", "UnpackedSint64", "UnpackedFixed32", "UnpackedFixed64", "UnpackedSfixed32", "UnpackedSfixed64", "UnpackedFloat", "UnpackedDouble", "UnpackedBool", "UnpackedEnum", });
-        internal__static_protobuf_unittest_TestPackedExtensions__Descriptor = Descriptor.MessageTypes[41];
+        internal__static_protobuf_unittest_TestPackedExtensions__Descriptor = Descriptor.MessageTypes[42];
         internal__static_protobuf_unittest_TestPackedExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestPackedExtensions, global::Google.ProtocolBuffers.TestProtos.TestPackedExtensions.Builder>(internal__static_protobuf_unittest_TestPackedExtensions__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestUnpackedExtensions__Descriptor = Descriptor.MessageTypes[42];
+        internal__static_protobuf_unittest_TestUnpackedExtensions__Descriptor = Descriptor.MessageTypes[43];
         internal__static_protobuf_unittest_TestUnpackedExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestUnpackedExtensions, global::Google.ProtocolBuffers.TestProtos.TestUnpackedExtensions.Builder>(internal__static_protobuf_unittest_TestUnpackedExtensions__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_TestDynamicExtensions__Descriptor = Descriptor.MessageTypes[43];
+        internal__static_protobuf_unittest_TestDynamicExtensions__Descriptor = Descriptor.MessageTypes[44];
         internal__static_protobuf_unittest_TestDynamicExtensions__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDynamicExtensions, global::Google.ProtocolBuffers.TestProtos.TestDynamicExtensions.Builder>(internal__static_protobuf_unittest_TestDynamicExtensions__Descriptor,
                 new string[] { "ScalarExtension", "EnumExtension", "DynamicEnumExtension", "MessageExtension", "DynamicMessageExtension", "RepeatedExtension", "PackedExtension", });
@@ -1213,11 +1222,11 @@ namespace Google.ProtocolBuffers.TestProtos {
         internal__static_protobuf_unittest_TestDynamicExtensions_DynamicMessageType__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestDynamicExtensions.Types.DynamicMessageType, global::Google.ProtocolBuffers.TestProtos.TestDynamicExtensions.Types.DynamicMessageType.Builder>(internal__static_protobuf_unittest_TestDynamicExtensions_DynamicMessageType__Descriptor,
                 new string[] { "DynamicField", });
-        internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__Descriptor = Descriptor.MessageTypes[44];
+        internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__Descriptor = Descriptor.MessageTypes[45];
         internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestRepeatedScalarDifferentTagSizes, global::Google.ProtocolBuffers.TestProtos.TestRepeatedScalarDifferentTagSizes.Builder>(internal__static_protobuf_unittest_TestRepeatedScalarDifferentTagSizes__Descriptor,
                 new string[] { "RepeatedFixed32", "RepeatedInt32", "RepeatedFixed64", "RepeatedInt64", "RepeatedFloat", "RepeatedUint64", });
-        internal__static_protobuf_unittest_TestParsingMerge__Descriptor = Descriptor.MessageTypes[45];
+        internal__static_protobuf_unittest_TestParsingMerge__Descriptor = Descriptor.MessageTypes[46];
         internal__static_protobuf_unittest_TestParsingMerge__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestParsingMerge, global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.Builder>(internal__static_protobuf_unittest_TestParsingMerge__Descriptor,
                 new string[] { "RequiredAllTypes", "OptionalAllTypes", "RepeatedAllTypes", "OptionalGroup", "RepeatedGroup", });
@@ -1243,31 +1252,31 @@ namespace Google.ProtocolBuffers.TestProtos {
                 new string[] { "RepeatedGroupAllTypes", });
         global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.OptionalExt = pb::GeneratedSingleExtension<global::Google.ProtocolBuffers.TestProtos.TestAllTypes>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.Descriptor.Extensions[0]);
         global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.RepeatedExt = pb::GeneratedRepeatExtension<global::Google.ProtocolBuffers.TestProtos.TestAllTypes>.CreateInstance(global::Google.ProtocolBuffers.TestProtos.TestParsingMerge.Descriptor.Extensions[1]);
-        internal__static_protobuf_unittest_TestCommentInjectionMessage__Descriptor = Descriptor.MessageTypes[46];
+        internal__static_protobuf_unittest_TestCommentInjectionMessage__Descriptor = Descriptor.MessageTypes[47];
         internal__static_protobuf_unittest_TestCommentInjectionMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.TestCommentInjectionMessage, global::Google.ProtocolBuffers.TestProtos.TestCommentInjectionMessage.Builder>(internal__static_protobuf_unittest_TestCommentInjectionMessage__Descriptor,
                 new string[] { "A", });
-        internal__static_protobuf_unittest_FooRequest__Descriptor = Descriptor.MessageTypes[47];
+        internal__static_protobuf_unittest_FooRequest__Descriptor = Descriptor.MessageTypes[48];
         internal__static_protobuf_unittest_FooRequest__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.FooRequest, global::Google.ProtocolBuffers.TestProtos.FooRequest.Builder>(internal__static_protobuf_unittest_FooRequest__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_FooResponse__Descriptor = Descriptor.MessageTypes[48];
+        internal__static_protobuf_unittest_FooResponse__Descriptor = Descriptor.MessageTypes[49];
         internal__static_protobuf_unittest_FooResponse__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.FooResponse, global::Google.ProtocolBuffers.TestProtos.FooResponse.Builder>(internal__static_protobuf_unittest_FooResponse__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_FooClientMessage__Descriptor = Descriptor.MessageTypes[49];
+        internal__static_protobuf_unittest_FooClientMessage__Descriptor = Descriptor.MessageTypes[50];
         internal__static_protobuf_unittest_FooClientMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.FooClientMessage, global::Google.ProtocolBuffers.TestProtos.FooClientMessage.Builder>(internal__static_protobuf_unittest_FooClientMessage__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_FooServerMessage__Descriptor = Descriptor.MessageTypes[50];
+        internal__static_protobuf_unittest_FooServerMessage__Descriptor = Descriptor.MessageTypes[51];
         internal__static_protobuf_unittest_FooServerMessage__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.FooServerMessage, global::Google.ProtocolBuffers.TestProtos.FooServerMessage.Builder>(internal__static_protobuf_unittest_FooServerMessage__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_BarRequest__Descriptor = Descriptor.MessageTypes[51];
+        internal__static_protobuf_unittest_BarRequest__Descriptor = Descriptor.MessageTypes[52];
         internal__static_protobuf_unittest_BarRequest__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.BarRequest, global::Google.ProtocolBuffers.TestProtos.BarRequest.Builder>(internal__static_protobuf_unittest_BarRequest__Descriptor,
                 new string[] { });
-        internal__static_protobuf_unittest_BarResponse__Descriptor = Descriptor.MessageTypes[52];
+        internal__static_protobuf_unittest_BarResponse__Descriptor = Descriptor.MessageTypes[53];
         internal__static_protobuf_unittest_BarResponse__FieldAccessorTable = 
             new pb::FieldAccess.FieldAccessorTable<global::Google.ProtocolBuffers.TestProtos.BarResponse, global::Google.ProtocolBuffers.TestProtos.BarResponse.Builder>(internal__static_protobuf_unittest_BarResponse__Descriptor,
                 new string[] { });
@@ -2281,6 +2290,19 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
     #endregion
 
+    private object oneofField_;
+    public enum OneofFieldOneofCase {
+      OneofUint32 = 111,
+      OneofNestedMessage = 112,
+      OneofString = 113,
+      OneofBytes = 114,
+      None = 0,
+    }
+    private OneofFieldOneofCase oneofFieldCase_ = OneofFieldOneofCase.None;
+    public OneofFieldOneofCase OneofFieldCase {
+      get { return oneofFieldCase_; }
+    }
+
     public const int OptionalInt32FieldNumber = 1;
     private bool hasOptionalInt32;
     private int optionalInt32_;
@@ -3042,43 +3064,35 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
 
     public const int OneofUint32FieldNumber = 111;
-    private bool hasOneofUint32;
-    private uint oneofUint32_;
     public bool HasOneofUint32 {
-      get { return hasOneofUint32; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofUint32; }
     }
     public uint OneofUint32 {
-      get { return oneofUint32_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofUint32 ? (uint) oneofField_ : 0; }
     }
 
     public const int OneofNestedMessageFieldNumber = 112;
-    private bool hasOneofNestedMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage oneofNestedMessage_;
     public bool HasOneofNestedMessage {
-      get { return hasOneofNestedMessage; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage OneofNestedMessage {
-      get { return oneofNestedMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage) oneofField_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance; }
     }
 
     public const int OneofStringFieldNumber = 113;
-    private bool hasOneofString;
-    private string oneofString_ = "";
     public bool HasOneofString {
-      get { return hasOneofString; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofString; }
     }
     public string OneofString {
-      get { return oneofString_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofString ? (string) oneofField_ : ""; }
     }
 
     public const int OneofBytesFieldNumber = 114;
-    private bool hasOneofBytes;
-    private pb::ByteString oneofBytes_ = pb::ByteString.Empty;
     public bool HasOneofBytes {
-      get { return hasOneofBytes; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofBytes; }
     }
     public pb::ByteString OneofBytes {
-      get { return oneofBytes_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofBytes ? (pb::ByteString) oneofField_ : pb::ByteString.Empty; }
     }
 
     public override bool IsInitialized {
@@ -3303,16 +3317,16 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasDefaultCord) {
         output.WriteString(85, field_names[2], DefaultCord);
       }
-      if (hasOneofUint32) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
         output.WriteUInt32(111, field_names[23], OneofUint32);
       }
-      if (hasOneofNestedMessage) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
         output.WriteMessage(112, field_names[21], OneofNestedMessage);
       }
-      if (hasOneofString) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
         output.WriteString(113, field_names[22], OneofString);
       }
-      if (hasOneofBytes) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
         output.WriteBytes(114, field_names[20], OneofBytes);
       }
       UnknownFields.WriteTo(output);
@@ -3637,16 +3651,16 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasDefaultCord) {
         size += pb::CodedOutputStream.ComputeStringSize(85, DefaultCord);
       }
-      if (hasOneofUint32) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
         size += pb::CodedOutputStream.ComputeUInt32Size(111, OneofUint32);
       }
-      if (hasOneofNestedMessage) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(112, OneofNestedMessage);
       }
-      if (hasOneofString) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
         size += pb::CodedOutputStream.ComputeStringSize(113, OneofString);
       }
-      if (hasOneofBytes) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
         size += pb::CodedOutputStream.ComputeBytesSize(114, OneofBytes);
       }
       size += UnknownFields.SerializedSize;
@@ -4009,17 +4023,24 @@ namespace Google.ProtocolBuffers.TestProtos {
         if (other.HasDefaultCord) {
           DefaultCord = other.DefaultCord;
         }
-        if (other.HasOneofUint32) {
-          OneofUint32 = other.OneofUint32;
-        }
-        if (other.HasOneofNestedMessage) {
-          MergeOneofNestedMessage(other.OneofNestedMessage);
-        }
-        if (other.HasOneofString) {
-          OneofString = other.OneofString;
-        }
-        if (other.HasOneofBytes) {
-          OneofBytes = other.OneofBytes;
+        switch (other.OneofFieldCase) {
+          case OneofFieldOneofCase.OneofUint32: {
+            SetOneofUint32(other.OneofUint32);
+            break;
+          }
+          case OneofFieldOneofCase.OneofNestedMessage: {
+            MergeOneofNestedMessage(other.OneofNestedMessage);
+            break;
+          }
+          case OneofFieldOneofCase.OneofString: {
+            SetOneofString(other.OneofString);
+            break;
+          }
+          case OneofFieldOneofCase.OneofBytes: {
+            SetOneofBytes(other.OneofBytes);
+            break;
+          }
+          case OneofFieldOneofCase.None: { break; }
         }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
@@ -4470,24 +4491,37 @@ namespace Google.ProtocolBuffers.TestProtos {
               break;
             }
             case 888: {
-              result.hasOneofUint32 = input.ReadUInt32(ref result.oneofUint32_);
+              uint value = 0;
+              if (input.ReadUInt32(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofUint32;
+              }
               break;
             }
             case 898: {
               global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.CreateBuilder();
-              if (result.hasOneofNestedMessage) {
+              if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
                 subBuilder.MergeFrom(OneofNestedMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              OneofNestedMessage = subBuilder.BuildPartial();
+              result.oneofField_ = subBuilder.BuildPartial();
+              result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
               break;
             }
             case 906: {
-              result.hasOneofString = input.ReadString(ref result.oneofString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofString;
+              }
               break;
             }
             case 914: {
-              result.hasOneofBytes = input.ReadBytes(ref result.oneofBytes_);
+              pb::ByteString value = pb::ByteString.Empty;
+              if (input.ReadBytes(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofBytes;
+              }
               break;
             }
           }
@@ -6377,104 +6411,119 @@ namespace Google.ProtocolBuffers.TestProtos {
       }
 
       public bool HasOneofUint32 {
-        get { return result.hasOneofUint32; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32; }
       }
       public uint OneofUint32 {
-        get { return result.OneofUint32; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32 ? (uint) result.oneofField_ : 0; }
         set { SetOneofUint32(value); }
       }
       public Builder SetOneofUint32(uint value) {
         PrepareBuilder();
-        result.hasOneofUint32 = true;
-        result.oneofUint32_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofUint32;
         return this;
       }
       public Builder ClearOneofUint32() {
         PrepareBuilder();
-        result.hasOneofUint32 = false;
-        result.oneofUint32_ = 0;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
         return this;
       }
 
       public bool HasOneofNestedMessage {
-       get { return result.hasOneofNestedMessage; }
+       get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage OneofNestedMessage {
-        get { return result.OneofNestedMessage; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage) result.oneofField_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance; }
         set { SetOneofNestedMessage(value); }
       }
       public Builder SetOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofNestedMessage = true;
-        result.oneofNestedMessage_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
+        result.oneofField_ = value;
         return this;
       }
       public Builder SetOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasOneofNestedMessage = true;
-        result.oneofNestedMessage_ = builderForValue.Build();
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
+        result.oneofField_ = builderForValue.Build();
         return this;
       }
       public Builder MergeOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasOneofNestedMessage &&
-            result.oneofNestedMessage_ != global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance) {
-            result.oneofNestedMessage_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.CreateBuilder(result.oneofNestedMessage_).MergeFrom(value).BuildPartial();
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage &&
+            result.OneofNestedMessage != global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.DefaultInstance) {
+          result.oneofField_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Types.NestedMessage.CreateBuilder(result.OneofNestedMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.oneofNestedMessage_ = value;
+          result.oneofField_ = value;
         }
-        result.hasOneofNestedMessage = true;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
         return this;
       }
       public Builder ClearOneofNestedMessage() {
-        PrepareBuilder();
-        result.hasOneofNestedMessage = false;
-        result.oneofNestedMessage_ = null;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
+          PrepareBuilder();
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+          result.oneofField_ = null;
+        }
         return this;
       }
 
       public bool HasOneofString {
-        get { return result.hasOneofString; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofString; }
       }
       public string OneofString {
-        get { return result.OneofString; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofString ? (string) result.oneofField_ : ""; }
         set { SetOneofString(value); }
       }
       public Builder SetOneofString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofString = true;
-        result.oneofString_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofString;
         return this;
       }
       public Builder ClearOneofString() {
         PrepareBuilder();
-        result.hasOneofString = false;
-        result.oneofString_ = "";
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
         return this;
       }
 
       public bool HasOneofBytes {
-        get { return result.hasOneofBytes; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofBytes; }
       }
       public pb::ByteString OneofBytes {
-        get { return result.OneofBytes; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofBytes ? (pb::ByteString) result.oneofField_ : pb::ByteString.Empty; }
         set { SetOneofBytes(value); }
       }
       public Builder SetOneofBytes(pb::ByteString value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofBytes = true;
-        result.oneofBytes_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofBytes;
         return this;
       }
       public Builder ClearOneofBytes() {
         PrepareBuilder();
-        result.hasOneofBytes = false;
-        result.oneofBytes_ = pb::ByteString.Empty;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
+        return this;
+      }
+
+      public OneofFieldOneofCase OneofFieldCase {
+        get { return result.oneofFieldCase_; }
+      }
+      public Builder ClearOneofField() {
+        PrepareBuilder();
+        result.oneofField_ = null;
+        result.oneofFieldCase_ = OneofFieldOneofCase.None;
         return this;
       }
     }
@@ -6487,8 +6536,8 @@ namespace Google.ProtocolBuffers.TestProtos {
   public sealed partial class NestedTestAllTypes : pb::GeneratedMessage<NestedTestAllTypes, NestedTestAllTypes.Builder> {
     private NestedTestAllTypes() { }
     private static readonly NestedTestAllTypes defaultInstance = new NestedTestAllTypes().MakeReadOnly();
-    private static readonly string[] _nestedTestAllTypesFieldNames = new string[] { "child", "payload" };
-    private static readonly uint[] _nestedTestAllTypesFieldTags = new uint[] { 10, 18 };
+    private static readonly string[] _nestedTestAllTypesFieldNames = new string[] { "child", "payload", "repeated_child" };
+    private static readonly uint[] _nestedTestAllTypesFieldTags = new uint[] { 10, 18, 26 };
     public static NestedTestAllTypes DefaultInstance {
       get { return defaultInstance; }
     }
@@ -6529,6 +6578,18 @@ namespace Google.ProtocolBuffers.TestProtos {
       get { return payload_ ?? global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance; }
     }
 
+    public const int RepeatedChildFieldNumber = 3;
+    private pbc::PopsicleList<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes> repeatedChild_ = new pbc::PopsicleList<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes>();
+    public scg::IList<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes> RepeatedChildList {
+      get { return repeatedChild_; }
+    }
+    public int RepeatedChildCount {
+      get { return repeatedChild_.Count; }
+    }
+    public global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes GetRepeatedChild(int index) {
+      return repeatedChild_[index];
+    }
+
     public override bool IsInitialized {
       get {
         return true;
@@ -6544,6 +6605,9 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasPayload) {
         output.WriteMessage(2, field_names[1], Payload);
       }
+      if (repeatedChild_.Count > 0) {
+        output.WriteMessageArray(3, field_names[2], repeatedChild_);
+      }
       UnknownFields.WriteTo(output);
     }
 
@@ -6567,6 +6631,9 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasPayload) {
         size += pb::CodedOutputStream.ComputeMessageSize(2, Payload);
       }
+      foreach (global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes element in RepeatedChildList) {
+        size += pb::CodedOutputStream.ComputeMessageSize(3, element);
+      }
       size += UnknownFields.SerializedSize;
       memoizedSerializedSize = size;
       return size;
@@ -6602,6 +6669,7 @@ namespace Google.ProtocolBuffers.TestProtos {
       return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
     }
     private NestedTestAllTypes MakeReadOnly() {
+      repeatedChild_.MakeReadOnly();
       return this;
     }
 
@@ -6695,6 +6763,9 @@ namespace Google.ProtocolBuffers.TestProtos {
         if (other.HasPayload) {
           MergePayload(other.Payload);
         }
+        if (other.repeatedChild_.Count != 0) {
+          result.repeatedChild_.Add(other.repeatedChild_);
+        }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
       }
@@ -6756,6 +6827,10 @@ namespace Google.ProtocolBuffers.TestProtos {
               Payload = subBuilder.BuildPartial();
               break;
             }
+            case 26: {
+              input.ReadMessageArray(tag, field_name, result.repeatedChild_, global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes.DefaultInstance, extensionRegistry);
+              break;
+            }
           }
         }
 
@@ -6845,6 +6920,50 @@ namespace Google.ProtocolBuffers.TestProtos {
         result.payload_ = null;
         return this;
       }
+
+      public pbc::IPopsicleList<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes> RepeatedChildList {
+        get { return PrepareBuilder().repeatedChild_; }
+      }
+      public int RepeatedChildCount {
+        get { return result.RepeatedChildCount; }
+      }
+      public global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes GetRepeatedChild(int index) {
+        return result.GetRepeatedChild(index);
+      }
+      public Builder SetRepeatedChild(int index, global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes value) {
+        pb::ThrowHelper.ThrowIfNull(value, "value");
+        PrepareBuilder();
+        result.repeatedChild_[index] = value;
+        return this;
+      }
+      public Builder SetRepeatedChild(int index, global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes.Builder builderForValue) {
+        pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
+        PrepareBuilder();
+        result.repeatedChild_[index] = builderForValue.Build();
+        return this;
+      }
+      public Builder AddRepeatedChild(global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes value) {
+        pb::ThrowHelper.ThrowIfNull(value, "value");
+        PrepareBuilder();
+        result.repeatedChild_.Add(value);
+        return this;
+      }
+      public Builder AddRepeatedChild(global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes.Builder builderForValue) {
+        pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
+        PrepareBuilder();
+        result.repeatedChild_.Add(builderForValue.Build());
+        return this;
+      }
+      public Builder AddRangeRepeatedChild(scg::IEnumerable<global::Google.ProtocolBuffers.TestProtos.NestedTestAllTypes> values) {
+        PrepareBuilder();
+        result.repeatedChild_.Add(values);
+        return this;
+      }
+      public Builder ClearRepeatedChild() {
+        PrepareBuilder();
+        result.repeatedChild_.Clear();
+        return this;
+      }
     }
     static NestedTestAllTypes() {
       object.ReferenceEquals(global::Google.ProtocolBuffers.TestProtos.Unittest.Descriptor, null);
@@ -7408,6 +7527,238 @@ namespace Google.ProtocolBuffers.TestProtos {
   }
 
   [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  public sealed partial class TestReservedFields : pb::GeneratedMessage<TestReservedFields, TestReservedFields.Builder> {
+    private TestReservedFields() { }
+    private static readonly TestReservedFields defaultInstance = new TestReservedFields().MakeReadOnly();
+    private static readonly string[] _testReservedFieldsFieldNames = new string[] {  };
+    private static readonly uint[] _testReservedFieldsFieldTags = new uint[] {  };
+    public static TestReservedFields DefaultInstance {
+      get { return defaultInstance; }
+    }
+
+    public override TestReservedFields DefaultInstanceForType {
+      get { return DefaultInstance; }
+    }
+
+    protected override TestReservedFields ThisMessage {
+      get { return this; }
+    }
+
+    public static pbd::MessageDescriptor Descriptor {
+      get { return global::Google.ProtocolBuffers.TestProtos.Unittest.internal__static_protobuf_unittest_TestReservedFields__Descriptor; }
+    }
+
+    protected override pb::FieldAccess.FieldAccessorTable<TestReservedFields, TestReservedFields.Builder> InternalFieldAccessors {
+      get { return global::Google.ProtocolBuffers.TestProtos.Unittest.internal__static_protobuf_unittest_TestReservedFields__FieldAccessorTable; }
+    }
+
+    public override bool IsInitialized {
+      get {
+        return true;
+      }
+    }
+
+    public override void WriteTo(pb::ICodedOutputStream output) {
+      CalcSerializedSize();
+      string[] field_names = _testReservedFieldsFieldNames;
+      UnknownFields.WriteTo(output);
+    }
+
+    private int memoizedSerializedSize = -1;
+    public override int SerializedSize {
+      get {
+        int size = memoizedSerializedSize;
+        if (size != -1) return size;
+        return CalcSerializedSize();
+      }
+    }
+
+    private int CalcSerializedSize() {
+      int size = memoizedSerializedSize;
+      if (size != -1) return size;
+
+      size = 0;
+      size += UnknownFields.SerializedSize;
+      memoizedSerializedSize = size;
+      return size;
+    }
+    public static TestReservedFields ParseFrom(pb::ByteString data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(pb::ByteString data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(byte[] data) {
+      return ((Builder) CreateBuilder().MergeFrom(data)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(byte[] data, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(data, extensionRegistry)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(global::System.IO.Stream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    public static TestReservedFields ParseDelimitedFrom(global::System.IO.Stream input) {
+      return CreateBuilder().MergeDelimitedFrom(input).BuildParsed();
+    }
+    public static TestReservedFields ParseDelimitedFrom(global::System.IO.Stream input, pb::ExtensionRegistry extensionRegistry) {
+      return CreateBuilder().MergeDelimitedFrom(input, extensionRegistry).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(pb::ICodedInputStream input) {
+      return ((Builder) CreateBuilder().MergeFrom(input)).BuildParsed();
+    }
+    public static TestReservedFields ParseFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+      return ((Builder) CreateBuilder().MergeFrom(input, extensionRegistry)).BuildParsed();
+    }
+    private TestReservedFields MakeReadOnly() {
+      return this;
+    }
+
+    public static Builder CreateBuilder() { return new Builder(); }
+    public override Builder ToBuilder() { return CreateBuilder(this); }
+    public override Builder CreateBuilderForType() { return new Builder(); }
+    public static Builder CreateBuilder(TestReservedFields prototype) {
+      return new Builder(prototype);
+    }
+
+    [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+    public sealed partial class Builder : pb::GeneratedBuilder<TestReservedFields, Builder> {
+      protected override Builder ThisBuilder {
+        get { return this; }
+      }
+      public Builder() {
+        result = DefaultInstance;
+        resultIsReadOnly = true;
+      }
+      internal Builder(TestReservedFields cloneFrom) {
+        result = cloneFrom;
+        resultIsReadOnly = true;
+      }
+
+      private bool resultIsReadOnly;
+      private TestReservedFields result;
+
+      private TestReservedFields PrepareBuilder() {
+        if (resultIsReadOnly) {
+          TestReservedFields original = result;
+          result = new TestReservedFields();
+          resultIsReadOnly = false;
+          MergeFrom(original);
+        }
+        return result;
+      }
+
+      public override bool IsInitialized {
+        get { return result.IsInitialized; }
+      }
+
+      protected override TestReservedFields MessageBeingBuilt {
+        get { return PrepareBuilder(); }
+      }
+
+      public override Builder Clear() {
+        result = DefaultInstance;
+        resultIsReadOnly = true;
+        return this;
+      }
+
+      public override Builder Clone() {
+        if (resultIsReadOnly) {
+          return new Builder(result);
+        } else {
+          return new Builder().MergeFrom(result);
+        }
+      }
+
+      public override pbd::MessageDescriptor DescriptorForType {
+        get { return global::Google.ProtocolBuffers.TestProtos.TestReservedFields.Descriptor; }
+      }
+
+      public override TestReservedFields DefaultInstanceForType {
+        get { return global::Google.ProtocolBuffers.TestProtos.TestReservedFields.DefaultInstance; }
+      }
+
+      public override TestReservedFields BuildPartial() {
+        if (resultIsReadOnly) {
+          return result;
+        }
+        resultIsReadOnly = true;
+        return result.MakeReadOnly();
+      }
+
+      public override Builder MergeFrom(pb::IMessage other) {
+        if (other is TestReservedFields) {
+          return MergeFrom((TestReservedFields) other);
+        } else {
+          base.MergeFrom(other);
+          return this;
+        }
+      }
+
+      public override Builder MergeFrom(TestReservedFields other) {
+        if (other == global::Google.ProtocolBuffers.TestProtos.TestReservedFields.DefaultInstance) return this;
+        PrepareBuilder();
+        this.MergeUnknownFields(other.UnknownFields);
+        return this;
+      }
+
+      public override Builder MergeFrom(pb::ICodedInputStream input) {
+        return MergeFrom(input, pb::ExtensionRegistry.Empty);
+      }
+
+      public override Builder MergeFrom(pb::ICodedInputStream input, pb::ExtensionRegistry extensionRegistry) {
+        PrepareBuilder();
+        pb::UnknownFieldSet.Builder unknownFields = null;
+        uint tag;
+        string field_name;
+        while (input.ReadTag(out tag, out field_name)) {
+          if(tag == 0 && field_name != null) {
+            int field_ordinal = global::System.Array.BinarySearch(_testReservedFieldsFieldNames, field_name, global::System.StringComparer.Ordinal);
+            if(field_ordinal >= 0)
+              tag = _testReservedFieldsFieldTags[field_ordinal];
+            else {
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              continue;
+            }
+          }
+          switch (tag) {
+            case 0: {
+              throw pb::InvalidProtocolBufferException.InvalidTag();
+            }
+            default: {
+              if (pb::WireFormat.IsEndGroupTag(tag)) {
+                if (unknownFields != null) {
+                  this.UnknownFields = unknownFields.Build();
+                }
+                return this;
+              }
+              if (unknownFields == null) {
+                unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
+              }
+              ParseUnknownField(input, unknownFields, extensionRegistry, tag, field_name);
+              break;
+            }
+          }
+        }
+
+        if (unknownFields != null) {
+          this.UnknownFields = unknownFields.Build();
+        }
+        return this;
+      }
+
+    }
+    static TestReservedFields() {
+      object.ReferenceEquals(global::Google.ProtocolBuffers.TestProtos.Unittest.Descriptor, null);
+    }
+  }
+
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
   public sealed partial class TestAllExtensions : pb::ExtendableMessage<TestAllExtensions, TestAllExtensions.Builder> {
     private TestAllExtensions() { }
     private static readonly TestAllExtensions defaultInstance = new TestAllExtensions().MakeReadOnly();
@@ -21288,44 +21639,49 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
     #endregion
 
+    private object foo_;
+    public enum FooOneofCase {
+      FooInt = 1,
+      FooString = 2,
+      FooMessage = 3,
+      FooGroup = 4,
+      None = 0,
+    }
+    private FooOneofCase fooCase_ = FooOneofCase.None;
+    public FooOneofCase FooCase {
+      get { return fooCase_; }
+    }
+
     public const int FooIntFieldNumber = 1;
-    private bool hasFooInt;
-    private int fooInt_;
     public bool HasFooInt {
-      get { return hasFooInt; }
+      get { return fooCase_ == FooOneofCase.FooInt; }
     }
     public int FooInt {
-      get { return fooInt_; }
+      get { return fooCase_ == FooOneofCase.FooInt ? (int) foo_ : 0; }
     }
 
     public const int FooStringFieldNumber = 2;
-    private bool hasFooString;
-    private string fooString_ = "";
     public bool HasFooString {
-      get { return hasFooString; }
+      get { return fooCase_ == FooOneofCase.FooString; }
     }
     public string FooString {
-      get { return fooString_; }
+      get { return fooCase_ == FooOneofCase.FooString ? (string) foo_ : ""; }
     }
 
     public const int FooMessageFieldNumber = 3;
-    private bool hasFooMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestAllTypes fooMessage_;
     public bool HasFooMessage {
-      get { return hasFooMessage; }
+      get { return fooCase_ == FooOneofCase.FooMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestAllTypes FooMessage {
-      get { return fooMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypes) foo_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance; }
     }
 
     public const int FooGroupFieldNumber = 4;
-    private bool hasFooGroup;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup fooGroup_;
     public bool HasFooGroup {
-      get { return hasFooGroup; }
+      get { return fooCase_ == FooOneofCase.FooGroup; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup FooGroup {
-      get { return fooGroup_ ?? global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooGroup ? (global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance; }
     }
 
     public override bool IsInitialized {
@@ -21337,16 +21693,16 @@ namespace Google.ProtocolBuffers.TestProtos {
     public override void WriteTo(pb::ICodedOutputStream output) {
       CalcSerializedSize();
       string[] field_names = _testOneofFieldNames;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         output.WriteInt32(1, field_names[0], FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         output.WriteString(2, field_names[2], FooString);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         output.WriteMessage(3, field_names[1], FooMessage);
       }
-      if (hasFooGroup) {
+      if (fooCase_ == FooOneofCase.FooGroup) {
         output.WriteGroup(4, field_names[3], FooGroup);
       }
       UnknownFields.WriteTo(output);
@@ -21366,16 +21722,16 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (size != -1) return size;
 
       size = 0;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         size += pb::CodedOutputStream.ComputeInt32Size(1, FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         size += pb::CodedOutputStream.ComputeStringSize(2, FooString);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(3, FooMessage);
       }
-      if (hasFooGroup) {
+      if (fooCase_ == FooOneofCase.FooGroup) {
         size += pb::CodedOutputStream.ComputeGroupSize(4, FooGroup);
       }
       size += UnknownFields.SerializedSize;
@@ -21500,17 +21856,24 @@ namespace Google.ProtocolBuffers.TestProtos {
       public override Builder MergeFrom(TestOneof other) {
         if (other == global::Google.ProtocolBuffers.TestProtos.TestOneof.DefaultInstance) return this;
         PrepareBuilder();
-        if (other.HasFooInt) {
-          FooInt = other.FooInt;
-        }
-        if (other.HasFooString) {
-          FooString = other.FooString;
-        }
-        if (other.HasFooMessage) {
-          MergeFooMessage(other.FooMessage);
-        }
-        if (other.HasFooGroup) {
-          MergeFooGroup(other.FooGroup);
+        switch (other.FooCase) {
+          case FooOneofCase.FooInt: {
+            SetFooInt(other.FooInt);
+            break;
+          }
+          case FooOneofCase.FooString: {
+            SetFooString(other.FooString);
+            break;
+          }
+          case FooOneofCase.FooMessage: {
+            MergeFooMessage(other.FooMessage);
+            break;
+          }
+          case FooOneofCase.FooGroup: {
+            MergeFooGroup(other.FooGroup);
+            break;
+          }
+          case FooOneofCase.None: { break; }
         }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
@@ -21556,29 +21919,39 @@ namespace Google.ProtocolBuffers.TestProtos {
               break;
             }
             case 8: {
-              result.hasFooInt = input.ReadInt32(ref result.fooInt_);
+              int value = 0;
+              if (input.ReadInt32(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooInt;
+              }
               break;
             }
             case 18: {
-              result.hasFooString = input.ReadString(ref result.fooString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooString;
+              }
               break;
             }
             case 26: {
               global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.CreateBuilder();
-              if (result.hasFooMessage) {
+              if (result.fooCase_ == FooOneofCase.FooMessage) {
                 subBuilder.MergeFrom(FooMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              FooMessage = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooMessage;
               break;
             }
             case 35: {
               global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.CreateBuilder();
-              if (result.hasFooGroup) {
+              if (result.fooCase_ == FooOneofCase.FooGroup) {
                 subBuilder.MergeFrom(FooGroup);
               }
               input.ReadGroup(4, subBuilder, extensionRegistry);
-              FooGroup = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooGroup;
               break;
             }
           }
@@ -21592,123 +21965,139 @@ namespace Google.ProtocolBuffers.TestProtos {
 
 
       public bool HasFooInt {
-        get { return result.hasFooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt; }
       }
       public int FooInt {
-        get { return result.FooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt ? (int) result.foo_ : 0; }
         set { SetFooInt(value); }
       }
       public Builder SetFooInt(int value) {
         PrepareBuilder();
-        result.hasFooInt = true;
-        result.fooInt_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooInt;
         return this;
       }
       public Builder ClearFooInt() {
         PrepareBuilder();
-        result.hasFooInt = false;
-        result.fooInt_ = 0;
+        if (result.fooCase_ == FooOneofCase.FooInt) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooString {
-        get { return result.hasFooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString; }
       }
       public string FooString {
-        get { return result.FooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString ? (string) result.foo_ : ""; }
         set { SetFooString(value); }
       }
       public Builder SetFooString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooString = true;
-        result.fooString_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooString;
         return this;
       }
       public Builder ClearFooString() {
         PrepareBuilder();
-        result.hasFooString = false;
-        result.fooString_ = "";
+        if (result.fooCase_ == FooOneofCase.FooString) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooMessage {
-       get { return result.hasFooMessage; }
+       get { return result.fooCase_ == FooOneofCase.FooMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestAllTypes FooMessage {
-        get { return result.FooMessage; }
+        get { return result.fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypes) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance; }
         set { SetFooMessage(value); }
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = value;
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypes value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooMessage &&
-            result.fooMessage_ != global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance) {
-            result.fooMessage_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.CreateBuilder(result.fooMessage_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooMessage &&
+            result.FooMessage != global::Google.ProtocolBuffers.TestProtos.TestAllTypes.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypes.CreateBuilder(result.FooMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.fooMessage_ = value;
+          result.foo_ = value;
         }
-        result.hasFooMessage = true;
+        result.fooCase_ = FooOneofCase.FooMessage;
         return this;
       }
       public Builder ClearFooMessage() {
-        PrepareBuilder();
-        result.hasFooMessage = false;
-        result.fooMessage_ = null;
+        if (result.fooCase_ == FooOneofCase.FooMessage) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
         return this;
       }
 
       public bool HasFooGroup {
-       get { return result.hasFooGroup; }
+       get { return result.fooCase_ == FooOneofCase.FooGroup; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup FooGroup {
-        get { return result.FooGroup; }
+        get { return result.fooCase_ == FooOneofCase.FooGroup ? (global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance; }
         set { SetFooGroup(value); }
       }
       public Builder SetFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooGroup = true;
-        result.fooGroup_ = value;
+        result.fooCase_ = FooOneofCase.FooGroup;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooGroup = true;
-        result.fooGroup_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooGroup;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooGroup &&
-            result.fooGroup_ != global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance) {
-            result.fooGroup_ = global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.CreateBuilder(result.fooGroup_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooGroup &&
+            result.FooGroup != global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestOneof.Types.FooGroup.CreateBuilder(result.FooGroup).MergeFrom(value).BuildPartial();
         } else {
-          result.fooGroup_ = value;
+          result.foo_ = value;
         }
-        result.hasFooGroup = true;
+        result.fooCase_ = FooOneofCase.FooGroup;
         return this;
       }
       public Builder ClearFooGroup() {
+        if (result.fooCase_ == FooOneofCase.FooGroup) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
+        return this;
+      }
+
+      public FooOneofCase FooCase {
+        get { return result.fooCase_; }
+      }
+      public Builder ClearFoo() {
         PrepareBuilder();
-        result.hasFooGroup = false;
-        result.fooGroup_ = null;
+        result.foo_ = null;
+        result.fooCase_ = FooOneofCase.None;
         return this;
       }
     }
@@ -23191,154 +23580,157 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
     #endregion
 
+    private object foo_;
+    public enum FooOneofCase {
+      FooInt = 1,
+      FooString = 2,
+      FooCord = 3,
+      FooStringPiece = 4,
+      FooBytes = 5,
+      FooEnum = 6,
+      FooMessage = 7,
+      FooGroup = 8,
+      FooLazyMessage = 11,
+      None = 0,
+    }
+    private FooOneofCase fooCase_ = FooOneofCase.None;
+    public FooOneofCase FooCase {
+      get { return fooCase_; }
+    }
+
+    private object bar_;
+    public enum BarOneofCase {
+      BarInt = 12,
+      BarString = 13,
+      BarCord = 14,
+      BarStringPiece = 15,
+      BarBytes = 16,
+      BarEnum = 17,
+      None = 0,
+    }
+    private BarOneofCase barCase_ = BarOneofCase.None;
+    public BarOneofCase BarCase {
+      get { return barCase_; }
+    }
+
     public const int FooIntFieldNumber = 1;
-    private bool hasFooInt;
-    private int fooInt_;
     public bool HasFooInt {
-      get { return hasFooInt; }
+      get { return fooCase_ == FooOneofCase.FooInt; }
     }
     public int FooInt {
-      get { return fooInt_; }
+      get { return fooCase_ == FooOneofCase.FooInt ? (int) foo_ : 0; }
     }
 
     public const int FooStringFieldNumber = 2;
-    private bool hasFooString;
-    private string fooString_ = "";
     public bool HasFooString {
-      get { return hasFooString; }
+      get { return fooCase_ == FooOneofCase.FooString; }
     }
     public string FooString {
-      get { return fooString_; }
+      get { return fooCase_ == FooOneofCase.FooString ? (string) foo_ : ""; }
     }
 
     public const int FooCordFieldNumber = 3;
-    private bool hasFooCord;
-    private string fooCord_ = "";
     public bool HasFooCord {
-      get { return hasFooCord; }
+      get { return fooCase_ == FooOneofCase.FooCord; }
     }
     public string FooCord {
-      get { return fooCord_; }
+      get { return fooCase_ == FooOneofCase.FooCord ? (string) foo_ : ""; }
     }
 
     public const int FooStringPieceFieldNumber = 4;
-    private bool hasFooStringPiece;
-    private string fooStringPiece_ = "";
     public bool HasFooStringPiece {
-      get { return hasFooStringPiece; }
+      get { return fooCase_ == FooOneofCase.FooStringPiece; }
     }
     public string FooStringPiece {
-      get { return fooStringPiece_; }
+      get { return fooCase_ == FooOneofCase.FooStringPiece ? (string) foo_ : ""; }
     }
 
     public const int FooBytesFieldNumber = 5;
-    private bool hasFooBytes;
-    private pb::ByteString fooBytes_ = pb::ByteString.Empty;
     public bool HasFooBytes {
-      get { return hasFooBytes; }
+      get { return fooCase_ == FooOneofCase.FooBytes; }
     }
     public pb::ByteString FooBytes {
-      get { return fooBytes_; }
+      get { return fooCase_ == FooOneofCase.FooBytes ? (pb::ByteString) foo_ : pb::ByteString.Empty; }
     }
 
     public const int FooEnumFieldNumber = 6;
-    private bool hasFooEnum;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum fooEnum_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO;
     public bool HasFooEnum {
-      get { return hasFooEnum; }
+      get { return fooCase_ == FooOneofCase.FooEnum; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum FooEnum {
-      get { return fooEnum_; }
+      get { return fooCase_ == FooOneofCase.FooEnum ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO; }
     }
 
     public const int FooMessageFieldNumber = 7;
-    private bool hasFooMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage fooMessage_;
     public bool HasFooMessage {
-      get { return hasFooMessage; }
+      get { return fooCase_ == FooOneofCase.FooMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage FooMessage {
-      get { return fooMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
     }
 
     public const int FooGroupFieldNumber = 8;
-    private bool hasFooGroup;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup fooGroup_;
     public bool HasFooGroup {
-      get { return hasFooGroup; }
+      get { return fooCase_ == FooOneofCase.FooGroup; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup FooGroup {
-      get { return fooGroup_ ?? global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooGroup ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance; }
     }
 
     public const int FooLazyMessageFieldNumber = 11;
-    private bool hasFooLazyMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage fooLazyMessage_;
     public bool HasFooLazyMessage {
-      get { return hasFooLazyMessage; }
+      get { return fooCase_ == FooOneofCase.FooLazyMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage FooLazyMessage {
-      get { return fooLazyMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooLazyMessage ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage) foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
     }
 
     public const int BarIntFieldNumber = 12;
-    private bool hasBarInt;
-    private int barInt_ = 5;
     public bool HasBarInt {
-      get { return hasBarInt; }
+      get { return barCase_ == BarOneofCase.BarInt; }
     }
     public int BarInt {
-      get { return barInt_; }
+      get { return barCase_ == BarOneofCase.BarInt ? (int) bar_ : 5; }
     }
 
     public const int BarStringFieldNumber = 13;
-    private bool hasBarString;
-    private string barString_ = "STRING";
     public bool HasBarString {
-      get { return hasBarString; }
+      get { return barCase_ == BarOneofCase.BarString; }
     }
     public string BarString {
-      get { return barString_; }
+      get { return barCase_ == BarOneofCase.BarString ? (string) bar_ : "STRING"; }
     }
 
     public const int BarCordFieldNumber = 14;
-    private bool hasBarCord;
-    private string barCord_ = "CORD";
     public bool HasBarCord {
-      get { return hasBarCord; }
+      get { return barCase_ == BarOneofCase.BarCord; }
     }
     public string BarCord {
-      get { return barCord_; }
+      get { return barCase_ == BarOneofCase.BarCord ? (string) bar_ : "CORD"; }
     }
 
     public const int BarStringPieceFieldNumber = 15;
-    private bool hasBarStringPiece;
-    private string barStringPiece_ = "SPIECE";
     public bool HasBarStringPiece {
-      get { return hasBarStringPiece; }
+      get { return barCase_ == BarOneofCase.BarStringPiece; }
     }
     public string BarStringPiece {
-      get { return barStringPiece_; }
+      get { return barCase_ == BarOneofCase.BarStringPiece ? (string) bar_ : "SPIECE"; }
     }
 
     public const int BarBytesFieldNumber = 16;
-    private bool hasBarBytes;
-    private pb::ByteString barBytes_ = (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue;
     public bool HasBarBytes {
-      get { return hasBarBytes; }
+      get { return barCase_ == BarOneofCase.BarBytes; }
     }
     public pb::ByteString BarBytes {
-      get { return barBytes_; }
+      get { return barCase_ == BarOneofCase.BarBytes ? (pb::ByteString) bar_ : (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue; }
     }
 
     public const int BarEnumFieldNumber = 17;
-    private bool hasBarEnum;
-    private global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum barEnum_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR;
     public bool HasBarEnum {
-      get { return hasBarEnum; }
+      get { return barCase_ == BarOneofCase.BarEnum; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum BarEnum {
-      get { return barEnum_; }
+      get { return barCase_ == BarOneofCase.BarEnum ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum) bar_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR; }
     }
 
     public const int BazIntFieldNumber = 18;
@@ -23370,49 +23762,49 @@ namespace Google.ProtocolBuffers.TestProtos {
     public override void WriteTo(pb::ICodedOutputStream output) {
       CalcSerializedSize();
       string[] field_names = _testOneof2FieldNames;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         output.WriteInt32(1, field_names[11], FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         output.WriteString(2, field_names[14], FooString);
       }
-      if (hasFooCord) {
+      if (fooCase_ == FooOneofCase.FooCord) {
         output.WriteString(3, field_names[9], FooCord);
       }
-      if (hasFooStringPiece) {
+      if (fooCase_ == FooOneofCase.FooStringPiece) {
         output.WriteString(4, field_names[15], FooStringPiece);
       }
-      if (hasFooBytes) {
+      if (fooCase_ == FooOneofCase.FooBytes) {
         output.WriteBytes(5, field_names[8], FooBytes);
       }
-      if (hasFooEnum) {
+      if (fooCase_ == FooOneofCase.FooEnum) {
         output.WriteEnum(6, field_names[10], (int) FooEnum, FooEnum);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         output.WriteMessage(7, field_names[13], FooMessage);
       }
-      if (hasFooGroup) {
+      if (fooCase_ == FooOneofCase.FooGroup) {
         output.WriteGroup(8, field_names[16], FooGroup);
       }
-      if (hasFooLazyMessage) {
+      if (fooCase_ == FooOneofCase.FooLazyMessage) {
         output.WriteMessage(11, field_names[12], FooLazyMessage);
       }
-      if (hasBarInt) {
+      if (barCase_ == BarOneofCase.BarInt) {
         output.WriteInt32(12, field_names[3], BarInt);
       }
-      if (hasBarString) {
+      if (barCase_ == BarOneofCase.BarString) {
         output.WriteString(13, field_names[4], BarString);
       }
-      if (hasBarCord) {
+      if (barCase_ == BarOneofCase.BarCord) {
         output.WriteString(14, field_names[1], BarCord);
       }
-      if (hasBarStringPiece) {
+      if (barCase_ == BarOneofCase.BarStringPiece) {
         output.WriteString(15, field_names[5], BarStringPiece);
       }
-      if (hasBarBytes) {
+      if (barCase_ == BarOneofCase.BarBytes) {
         output.WriteBytes(16, field_names[0], BarBytes);
       }
-      if (hasBarEnum) {
+      if (barCase_ == BarOneofCase.BarEnum) {
         output.WriteEnum(17, field_names[2], (int) BarEnum, BarEnum);
       }
       if (hasBazInt) {
@@ -23438,49 +23830,49 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (size != -1) return size;
 
       size = 0;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         size += pb::CodedOutputStream.ComputeInt32Size(1, FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         size += pb::CodedOutputStream.ComputeStringSize(2, FooString);
       }
-      if (hasFooCord) {
+      if (fooCase_ == FooOneofCase.FooCord) {
         size += pb::CodedOutputStream.ComputeStringSize(3, FooCord);
       }
-      if (hasFooStringPiece) {
+      if (fooCase_ == FooOneofCase.FooStringPiece) {
         size += pb::CodedOutputStream.ComputeStringSize(4, FooStringPiece);
       }
-      if (hasFooBytes) {
+      if (fooCase_ == FooOneofCase.FooBytes) {
         size += pb::CodedOutputStream.ComputeBytesSize(5, FooBytes);
       }
-      if (hasFooEnum) {
+      if (fooCase_ == FooOneofCase.FooEnum) {
         size += pb::CodedOutputStream.ComputeEnumSize(6, (int) FooEnum);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(7, FooMessage);
       }
-      if (hasFooGroup) {
+      if (fooCase_ == FooOneofCase.FooGroup) {
         size += pb::CodedOutputStream.ComputeGroupSize(8, FooGroup);
       }
-      if (hasFooLazyMessage) {
+      if (fooCase_ == FooOneofCase.FooLazyMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(11, FooLazyMessage);
       }
-      if (hasBarInt) {
+      if (barCase_ == BarOneofCase.BarInt) {
         size += pb::CodedOutputStream.ComputeInt32Size(12, BarInt);
       }
-      if (hasBarString) {
+      if (barCase_ == BarOneofCase.BarString) {
         size += pb::CodedOutputStream.ComputeStringSize(13, BarString);
       }
-      if (hasBarCord) {
+      if (barCase_ == BarOneofCase.BarCord) {
         size += pb::CodedOutputStream.ComputeStringSize(14, BarCord);
       }
-      if (hasBarStringPiece) {
+      if (barCase_ == BarOneofCase.BarStringPiece) {
         size += pb::CodedOutputStream.ComputeStringSize(15, BarStringPiece);
       }
-      if (hasBarBytes) {
+      if (barCase_ == BarOneofCase.BarBytes) {
         size += pb::CodedOutputStream.ComputeBytesSize(16, BarBytes);
       }
-      if (hasBarEnum) {
+      if (barCase_ == BarOneofCase.BarEnum) {
         size += pb::CodedOutputStream.ComputeEnumSize(17, (int) BarEnum);
       }
       if (hasBazInt) {
@@ -23611,57 +24003,78 @@ namespace Google.ProtocolBuffers.TestProtos {
       public override Builder MergeFrom(TestOneof2 other) {
         if (other == global::Google.ProtocolBuffers.TestProtos.TestOneof2.DefaultInstance) return this;
         PrepareBuilder();
-        if (other.HasFooInt) {
-          FooInt = other.FooInt;
-        }
-        if (other.HasFooString) {
-          FooString = other.FooString;
-        }
-        if (other.HasFooCord) {
-          FooCord = other.FooCord;
-        }
-        if (other.HasFooStringPiece) {
-          FooStringPiece = other.FooStringPiece;
-        }
-        if (other.HasFooBytes) {
-          FooBytes = other.FooBytes;
-        }
-        if (other.HasFooEnum) {
-          FooEnum = other.FooEnum;
-        }
-        if (other.HasFooMessage) {
-          MergeFooMessage(other.FooMessage);
-        }
-        if (other.HasFooGroup) {
-          MergeFooGroup(other.FooGroup);
-        }
-        if (other.HasFooLazyMessage) {
-          MergeFooLazyMessage(other.FooLazyMessage);
-        }
-        if (other.HasBarInt) {
-          BarInt = other.BarInt;
-        }
-        if (other.HasBarString) {
-          BarString = other.BarString;
-        }
-        if (other.HasBarCord) {
-          BarCord = other.BarCord;
-        }
-        if (other.HasBarStringPiece) {
-          BarStringPiece = other.BarStringPiece;
-        }
-        if (other.HasBarBytes) {
-          BarBytes = other.BarBytes;
-        }
-        if (other.HasBarEnum) {
-          BarEnum = other.BarEnum;
-        }
         if (other.HasBazInt) {
           BazInt = other.BazInt;
         }
         if (other.HasBazString) {
           BazString = other.BazString;
         }
+        switch (other.FooCase) {
+          case FooOneofCase.FooInt: {
+            SetFooInt(other.FooInt);
+            break;
+          }
+          case FooOneofCase.FooString: {
+            SetFooString(other.FooString);
+            break;
+          }
+          case FooOneofCase.FooCord: {
+            SetFooCord(other.FooCord);
+            break;
+          }
+          case FooOneofCase.FooStringPiece: {
+            SetFooStringPiece(other.FooStringPiece);
+            break;
+          }
+          case FooOneofCase.FooBytes: {
+            SetFooBytes(other.FooBytes);
+            break;
+          }
+          case FooOneofCase.FooEnum: {
+            SetFooEnum(other.FooEnum);
+            break;
+          }
+          case FooOneofCase.FooMessage: {
+            MergeFooMessage(other.FooMessage);
+            break;
+          }
+          case FooOneofCase.FooGroup: {
+            MergeFooGroup(other.FooGroup);
+            break;
+          }
+          case FooOneofCase.FooLazyMessage: {
+            MergeFooLazyMessage(other.FooLazyMessage);
+            break;
+          }
+          case FooOneofCase.None: { break; }
+        }
+        switch (other.BarCase) {
+          case BarOneofCase.BarInt: {
+            SetBarInt(other.BarInt);
+            break;
+          }
+          case BarOneofCase.BarString: {
+            SetBarString(other.BarString);
+            break;
+          }
+          case BarOneofCase.BarCord: {
+            SetBarCord(other.BarCord);
+            break;
+          }
+          case BarOneofCase.BarStringPiece: {
+            SetBarStringPiece(other.BarStringPiece);
+            break;
+          }
+          case BarOneofCase.BarBytes: {
+            SetBarBytes(other.BarBytes);
+            break;
+          }
+          case BarOneofCase.BarEnum: {
+            SetBarEnum(other.BarEnum);
+            break;
+          }
+          case BarOneofCase.None: { break; }
+        }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
       }
@@ -23706,29 +24119,51 @@ namespace Google.ProtocolBuffers.TestProtos {
               break;
             }
             case 8: {
-              result.hasFooInt = input.ReadInt32(ref result.fooInt_);
+              int value = 0;
+              if (input.ReadInt32(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooInt;
+              }
               break;
             }
             case 18: {
-              result.hasFooString = input.ReadString(ref result.fooString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooString;
+              }
               break;
             }
             case 26: {
-              result.hasFooCord = input.ReadString(ref result.fooCord_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooCord;
+              }
               break;
             }
             case 34: {
-              result.hasFooStringPiece = input.ReadString(ref result.fooStringPiece_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooStringPiece;
+              }
               break;
             }
             case 42: {
-              result.hasFooBytes = input.ReadBytes(ref result.fooBytes_);
+              pb::ByteString value = pb::ByteString.Empty;
+              if (input.ReadBytes(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooBytes;
+              }
               break;
             }
             case 48: {
               object unknown;
-              if(input.ReadEnum(ref result.fooEnum_, out unknown)) {
-                result.hasFooEnum = true;
+              global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum enumValue = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO;
+              if(input.ReadEnum(ref enumValue, out unknown)) {
+                result.foo_ = enumValue;
+                result.fooCase_ = FooOneofCase.FooEnum;
               } else if(unknown is int) {
                 if (unknownFields == null) {
                   unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
@@ -23739,55 +24174,80 @@ namespace Google.ProtocolBuffers.TestProtos {
             }
             case 58: {
               global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder();
-              if (result.hasFooMessage) {
+              if (result.fooCase_ == FooOneofCase.FooMessage) {
                 subBuilder.MergeFrom(FooMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              FooMessage = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooMessage;
               break;
             }
             case 67: {
               global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.CreateBuilder();
-              if (result.hasFooGroup) {
+              if (result.fooCase_ == FooOneofCase.FooGroup) {
                 subBuilder.MergeFrom(FooGroup);
               }
               input.ReadGroup(8, subBuilder, extensionRegistry);
-              FooGroup = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooGroup;
               break;
             }
             case 90: {
               global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder();
-              if (result.hasFooLazyMessage) {
+              if (result.fooCase_ == FooOneofCase.FooLazyMessage) {
                 subBuilder.MergeFrom(FooLazyMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              FooLazyMessage = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooLazyMessage;
               break;
             }
             case 96: {
-              result.hasBarInt = input.ReadInt32(ref result.barInt_);
+              int value = 5;
+              if (input.ReadInt32(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarInt;
+              }
               break;
             }
             case 106: {
-              result.hasBarString = input.ReadString(ref result.barString_);
+              string value = "STRING";
+              if (input.ReadString(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarString;
+              }
               break;
             }
             case 114: {
-              result.hasBarCord = input.ReadString(ref result.barCord_);
+              string value = "CORD";
+              if (input.ReadString(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarCord;
+              }
               break;
             }
             case 122: {
-              result.hasBarStringPiece = input.ReadString(ref result.barStringPiece_);
+              string value = "SPIECE";
+              if (input.ReadString(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarStringPiece;
+              }
               break;
             }
             case 130: {
-              result.hasBarBytes = input.ReadBytes(ref result.barBytes_);
+              pb::ByteString value = (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue;
+              if (input.ReadBytes(ref value)) {
+                result.bar_ = value;
+                result.barCase_ = BarOneofCase.BarBytes;
+              }
               break;
             }
             case 136: {
               object unknown;
-              if(input.ReadEnum(ref result.barEnum_, out unknown)) {
-                result.hasBarEnum = true;
+              global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum enumValue = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR;
+              if(input.ReadEnum(ref enumValue, out unknown)) {
+                result.bar_ = enumValue;
+                result.barCase_ = BarOneofCase.BarEnum;
               } else if(unknown is int) {
                 if (unknownFields == null) {
                   unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);
@@ -23815,370 +24275,388 @@ namespace Google.ProtocolBuffers.TestProtos {
 
 
       public bool HasFooInt {
-        get { return result.hasFooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt; }
       }
       public int FooInt {
-        get { return result.FooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt ? (int) result.foo_ : 0; }
         set { SetFooInt(value); }
       }
       public Builder SetFooInt(int value) {
         PrepareBuilder();
-        result.hasFooInt = true;
-        result.fooInt_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooInt;
         return this;
       }
       public Builder ClearFooInt() {
         PrepareBuilder();
-        result.hasFooInt = false;
-        result.fooInt_ = 0;
+        if (result.fooCase_ == FooOneofCase.FooInt) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooString {
-        get { return result.hasFooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString; }
       }
       public string FooString {
-        get { return result.FooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString ? (string) result.foo_ : ""; }
         set { SetFooString(value); }
       }
       public Builder SetFooString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooString = true;
-        result.fooString_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooString;
         return this;
       }
       public Builder ClearFooString() {
         PrepareBuilder();
-        result.hasFooString = false;
-        result.fooString_ = "";
+        if (result.fooCase_ == FooOneofCase.FooString) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooCord {
-        get { return result.hasFooCord; }
+        get { return result.fooCase_ == FooOneofCase.FooCord; }
       }
       public string FooCord {
-        get { return result.FooCord; }
+        get { return result.fooCase_ == FooOneofCase.FooCord ? (string) result.foo_ : ""; }
         set { SetFooCord(value); }
       }
       public Builder SetFooCord(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooCord = true;
-        result.fooCord_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooCord;
         return this;
       }
       public Builder ClearFooCord() {
         PrepareBuilder();
-        result.hasFooCord = false;
-        result.fooCord_ = "";
+        if (result.fooCase_ == FooOneofCase.FooCord) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooStringPiece {
-        get { return result.hasFooStringPiece; }
+        get { return result.fooCase_ == FooOneofCase.FooStringPiece; }
       }
       public string FooStringPiece {
-        get { return result.FooStringPiece; }
+        get { return result.fooCase_ == FooOneofCase.FooStringPiece ? (string) result.foo_ : ""; }
         set { SetFooStringPiece(value); }
       }
       public Builder SetFooStringPiece(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooStringPiece = true;
-        result.fooStringPiece_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooStringPiece;
         return this;
       }
       public Builder ClearFooStringPiece() {
         PrepareBuilder();
-        result.hasFooStringPiece = false;
-        result.fooStringPiece_ = "";
+        if (result.fooCase_ == FooOneofCase.FooStringPiece) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooBytes {
-        get { return result.hasFooBytes; }
+        get { return result.fooCase_ == FooOneofCase.FooBytes; }
       }
       public pb::ByteString FooBytes {
-        get { return result.FooBytes; }
+        get { return result.fooCase_ == FooOneofCase.FooBytes ? (pb::ByteString) result.foo_ : pb::ByteString.Empty; }
         set { SetFooBytes(value); }
       }
       public Builder SetFooBytes(pb::ByteString value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooBytes = true;
-        result.fooBytes_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooBytes;
         return this;
       }
       public Builder ClearFooBytes() {
         PrepareBuilder();
-        result.hasFooBytes = false;
-        result.fooBytes_ = pb::ByteString.Empty;
+        if (result.fooCase_ == FooOneofCase.FooBytes) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooEnum {
-       get { return result.hasFooEnum; }
+       get { return result.fooCase_ == FooOneofCase.FooEnum; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum FooEnum {
-        get { return result.FooEnum; }
+        get { return result.fooCase_ == FooOneofCase.FooEnum ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO; }
         set { SetFooEnum(value); }
       }
       public Builder SetFooEnum(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum value) {
         PrepareBuilder();
-        result.hasFooEnum = true;
-        result.fooEnum_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooEnum;
         return this;
       }
       public Builder ClearFooEnum() {
         PrepareBuilder();
-        result.hasFooEnum = false;
-        result.fooEnum_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.FOO;
+        if (result.fooCase_ == FooOneofCase.FooEnum) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooMessage {
-       get { return result.hasFooMessage; }
+       get { return result.fooCase_ == FooOneofCase.FooMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage FooMessage {
-        get { return result.FooMessage; }
+        get { return result.fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
         set { SetFooMessage(value); }
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = value;
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooMessage &&
-            result.fooMessage_ != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance) {
-            result.fooMessage_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder(result.fooMessage_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooMessage &&
+            result.FooMessage != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder(result.FooMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.fooMessage_ = value;
+          result.foo_ = value;
         }
-        result.hasFooMessage = true;
+        result.fooCase_ = FooOneofCase.FooMessage;
         return this;
       }
       public Builder ClearFooMessage() {
-        PrepareBuilder();
-        result.hasFooMessage = false;
-        result.fooMessage_ = null;
+        if (result.fooCase_ == FooOneofCase.FooMessage) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
         return this;
       }
 
       public bool HasFooGroup {
-       get { return result.hasFooGroup; }
+       get { return result.fooCase_ == FooOneofCase.FooGroup; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup FooGroup {
-        get { return result.FooGroup; }
+        get { return result.fooCase_ == FooOneofCase.FooGroup ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance; }
         set { SetFooGroup(value); }
       }
       public Builder SetFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooGroup = true;
-        result.fooGroup_ = value;
+        result.fooCase_ = FooOneofCase.FooGroup;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooGroup = true;
-        result.fooGroup_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooGroup;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooGroup(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooGroup &&
-            result.fooGroup_ != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance) {
-            result.fooGroup_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.CreateBuilder(result.fooGroup_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooGroup &&
+            result.FooGroup != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.FooGroup.CreateBuilder(result.FooGroup).MergeFrom(value).BuildPartial();
         } else {
-          result.fooGroup_ = value;
+          result.foo_ = value;
         }
-        result.hasFooGroup = true;
+        result.fooCase_ = FooOneofCase.FooGroup;
         return this;
       }
       public Builder ClearFooGroup() {
-        PrepareBuilder();
-        result.hasFooGroup = false;
-        result.fooGroup_ = null;
+        if (result.fooCase_ == FooOneofCase.FooGroup) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
         return this;
       }
 
       public bool HasFooLazyMessage {
-       get { return result.hasFooLazyMessage; }
+       get { return result.fooCase_ == FooOneofCase.FooLazyMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage FooLazyMessage {
-        get { return result.FooLazyMessage; }
+        get { return result.fooCase_ == FooOneofCase.FooLazyMessage ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance; }
         set { SetFooLazyMessage(value); }
       }
       public Builder SetFooLazyMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooLazyMessage = true;
-        result.fooLazyMessage_ = value;
+        result.fooCase_ = FooOneofCase.FooLazyMessage;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooLazyMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooLazyMessage = true;
-        result.fooLazyMessage_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooLazyMessage;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooLazyMessage(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooLazyMessage &&
-            result.fooLazyMessage_ != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance) {
-            result.fooLazyMessage_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder(result.fooLazyMessage_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooLazyMessage &&
+            result.FooLazyMessage != global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedMessage.CreateBuilder(result.FooLazyMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.fooLazyMessage_ = value;
+          result.foo_ = value;
         }
-        result.hasFooLazyMessage = true;
+        result.fooCase_ = FooOneofCase.FooLazyMessage;
         return this;
       }
       public Builder ClearFooLazyMessage() {
-        PrepareBuilder();
-        result.hasFooLazyMessage = false;
-        result.fooLazyMessage_ = null;
+        if (result.fooCase_ == FooOneofCase.FooLazyMessage) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
         return this;
       }
 
       public bool HasBarInt {
-        get { return result.hasBarInt; }
+        get { return result.barCase_ == BarOneofCase.BarInt; }
       }
       public int BarInt {
-        get { return result.BarInt; }
+        get { return result.barCase_ == BarOneofCase.BarInt ? (int) result.bar_ : 5; }
         set { SetBarInt(value); }
       }
       public Builder SetBarInt(int value) {
         PrepareBuilder();
-        result.hasBarInt = true;
-        result.barInt_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarInt;
         return this;
       }
       public Builder ClearBarInt() {
         PrepareBuilder();
-        result.hasBarInt = false;
-        result.barInt_ = 5;
+        if (result.barCase_ == BarOneofCase.BarInt) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarString {
-        get { return result.hasBarString; }
+        get { return result.barCase_ == BarOneofCase.BarString; }
       }
       public string BarString {
-        get { return result.BarString; }
+        get { return result.barCase_ == BarOneofCase.BarString ? (string) result.bar_ : "STRING"; }
         set { SetBarString(value); }
       }
       public Builder SetBarString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasBarString = true;
-        result.barString_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarString;
         return this;
       }
       public Builder ClearBarString() {
         PrepareBuilder();
-        result.hasBarString = false;
-        result.barString_ = "STRING";
+        if (result.barCase_ == BarOneofCase.BarString) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarCord {
-        get { return result.hasBarCord; }
+        get { return result.barCase_ == BarOneofCase.BarCord; }
       }
       public string BarCord {
-        get { return result.BarCord; }
+        get { return result.barCase_ == BarOneofCase.BarCord ? (string) result.bar_ : "CORD"; }
         set { SetBarCord(value); }
       }
       public Builder SetBarCord(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasBarCord = true;
-        result.barCord_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarCord;
         return this;
       }
       public Builder ClearBarCord() {
         PrepareBuilder();
-        result.hasBarCord = false;
-        result.barCord_ = "CORD";
+        if (result.barCase_ == BarOneofCase.BarCord) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarStringPiece {
-        get { return result.hasBarStringPiece; }
+        get { return result.barCase_ == BarOneofCase.BarStringPiece; }
       }
       public string BarStringPiece {
-        get { return result.BarStringPiece; }
+        get { return result.barCase_ == BarOneofCase.BarStringPiece ? (string) result.bar_ : "SPIECE"; }
         set { SetBarStringPiece(value); }
       }
       public Builder SetBarStringPiece(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasBarStringPiece = true;
-        result.barStringPiece_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarStringPiece;
         return this;
       }
       public Builder ClearBarStringPiece() {
         PrepareBuilder();
-        result.hasBarStringPiece = false;
-        result.barStringPiece_ = "SPIECE";
+        if (result.barCase_ == BarOneofCase.BarStringPiece) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarBytes {
-        get { return result.hasBarBytes; }
+        get { return result.barCase_ == BarOneofCase.BarBytes; }
       }
       public pb::ByteString BarBytes {
-        get { return result.BarBytes; }
+        get { return result.barCase_ == BarOneofCase.BarBytes ? (pb::ByteString) result.bar_ : (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue; }
         set { SetBarBytes(value); }
       }
       public Builder SetBarBytes(pb::ByteString value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasBarBytes = true;
-        result.barBytes_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarBytes;
         return this;
       }
       public Builder ClearBarBytes() {
         PrepareBuilder();
-        result.hasBarBytes = false;
-        result.barBytes_ = (pb::ByteString) global::Google.ProtocolBuffers.TestProtos.TestOneof2.Descriptor.Fields[13].DefaultValue;
+        if (result.barCase_ == BarOneofCase.BarBytes) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
       public bool HasBarEnum {
-       get { return result.hasBarEnum; }
+       get { return result.barCase_ == BarOneofCase.BarEnum; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum BarEnum {
-        get { return result.BarEnum; }
+        get { return result.barCase_ == BarOneofCase.BarEnum ? (global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum) result.bar_ : global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR; }
         set { SetBarEnum(value); }
       }
       public Builder SetBarEnum(global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum value) {
         PrepareBuilder();
-        result.hasBarEnum = true;
-        result.barEnum_ = value;
+        result.bar_ = value;
+        result.barCase_ = BarOneofCase.BarEnum;
         return this;
       }
       public Builder ClearBarEnum() {
         PrepareBuilder();
-        result.hasBarEnum = false;
-        result.barEnum_ = global::Google.ProtocolBuffers.TestProtos.TestOneof2.Types.NestedEnum.BAR;
+        if (result.barCase_ == BarOneofCase.BarEnum) {
+          result.barCase_ = BarOneofCase.None;
+        }
         return this;
       }
 
@@ -24222,6 +24700,26 @@ namespace Google.ProtocolBuffers.TestProtos {
         result.bazString_ = "BAZ";
         return this;
       }
+
+      public FooOneofCase FooCase {
+        get { return result.fooCase_; }
+      }
+      public Builder ClearFoo() {
+        PrepareBuilder();
+        result.foo_ = null;
+        result.fooCase_ = FooOneofCase.None;
+        return this;
+      }
+
+      public BarOneofCase BarCase {
+        get { return result.barCase_; }
+      }
+      public Builder ClearBar() {
+        PrepareBuilder();
+        result.bar_ = null;
+        result.barCase_ = BarOneofCase.None;
+        return this;
+      }
     }
     static TestOneof2() {
       object.ReferenceEquals(global::Google.ProtocolBuffers.TestProtos.Unittest.Descriptor, null);
@@ -24536,34 +25034,40 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
     #endregion
 
+    private object foo_;
+    public enum FooOneofCase {
+      FooInt = 1,
+      FooString = 2,
+      FooMessage = 3,
+      None = 0,
+    }
+    private FooOneofCase fooCase_ = FooOneofCase.None;
+    public FooOneofCase FooCase {
+      get { return fooCase_; }
+    }
+
     public const int FooIntFieldNumber = 1;
-    private bool hasFooInt;
-    private int fooInt_;
     public bool HasFooInt {
-      get { return hasFooInt; }
+      get { return fooCase_ == FooOneofCase.FooInt; }
     }
     public int FooInt {
-      get { return fooInt_; }
+      get { return fooCase_ == FooOneofCase.FooInt ? (int) foo_ : 0; }
     }
 
     public const int FooStringFieldNumber = 2;
-    private bool hasFooString;
-    private string fooString_ = "";
     public bool HasFooString {
-      get { return hasFooString; }
+      get { return fooCase_ == FooOneofCase.FooString; }
     }
     public string FooString {
-      get { return fooString_; }
+      get { return fooCase_ == FooOneofCase.FooString ? (string) foo_ : ""; }
     }
 
     public const int FooMessageFieldNumber = 3;
-    private bool hasFooMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage fooMessage_;
     public bool HasFooMessage {
-      get { return hasFooMessage; }
+      get { return fooCase_ == FooOneofCase.FooMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage FooMessage {
-      get { return fooMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance; }
+      get { return fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage) foo_ : global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance; }
     }
 
     public override bool IsInitialized {
@@ -24578,13 +25082,13 @@ namespace Google.ProtocolBuffers.TestProtos {
     public override void WriteTo(pb::ICodedOutputStream output) {
       CalcSerializedSize();
       string[] field_names = _testRequiredOneofFieldNames;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         output.WriteInt32(1, field_names[0], FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         output.WriteString(2, field_names[2], FooString);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         output.WriteMessage(3, field_names[1], FooMessage);
       }
       UnknownFields.WriteTo(output);
@@ -24604,13 +25108,13 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (size != -1) return size;
 
       size = 0;
-      if (hasFooInt) {
+      if (fooCase_ == FooOneofCase.FooInt) {
         size += pb::CodedOutputStream.ComputeInt32Size(1, FooInt);
       }
-      if (hasFooString) {
+      if (fooCase_ == FooOneofCase.FooString) {
         size += pb::CodedOutputStream.ComputeStringSize(2, FooString);
       }
-      if (hasFooMessage) {
+      if (fooCase_ == FooOneofCase.FooMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(3, FooMessage);
       }
       size += UnknownFields.SerializedSize;
@@ -24735,14 +25239,20 @@ namespace Google.ProtocolBuffers.TestProtos {
       public override Builder MergeFrom(TestRequiredOneof other) {
         if (other == global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.DefaultInstance) return this;
         PrepareBuilder();
-        if (other.HasFooInt) {
-          FooInt = other.FooInt;
-        }
-        if (other.HasFooString) {
-          FooString = other.FooString;
-        }
-        if (other.HasFooMessage) {
-          MergeFooMessage(other.FooMessage);
+        switch (other.FooCase) {
+          case FooOneofCase.FooInt: {
+            SetFooInt(other.FooInt);
+            break;
+          }
+          case FooOneofCase.FooString: {
+            SetFooString(other.FooString);
+            break;
+          }
+          case FooOneofCase.FooMessage: {
+            MergeFooMessage(other.FooMessage);
+            break;
+          }
+          case FooOneofCase.None: { break; }
         }
         this.MergeUnknownFields(other.UnknownFields);
         return this;
@@ -24788,20 +25298,29 @@ namespace Google.ProtocolBuffers.TestProtos {
               break;
             }
             case 8: {
-              result.hasFooInt = input.ReadInt32(ref result.fooInt_);
+              int value = 0;
+              if (input.ReadInt32(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooInt;
+              }
               break;
             }
             case 18: {
-              result.hasFooString = input.ReadString(ref result.fooString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.foo_ = value;
+                result.fooCase_ = FooOneofCase.FooString;
+              }
               break;
             }
             case 26: {
               global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.CreateBuilder();
-              if (result.hasFooMessage) {
+              if (result.fooCase_ == FooOneofCase.FooMessage) {
                 subBuilder.MergeFrom(FooMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              FooMessage = subBuilder.BuildPartial();
+              result.foo_ = subBuilder.BuildPartial();
+              result.fooCase_ = FooOneofCase.FooMessage;
               break;
             }
           }
@@ -24815,83 +25334,97 @@ namespace Google.ProtocolBuffers.TestProtos {
 
 
       public bool HasFooInt {
-        get { return result.hasFooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt; }
       }
       public int FooInt {
-        get { return result.FooInt; }
+        get { return result.fooCase_ == FooOneofCase.FooInt ? (int) result.foo_ : 0; }
         set { SetFooInt(value); }
       }
       public Builder SetFooInt(int value) {
         PrepareBuilder();
-        result.hasFooInt = true;
-        result.fooInt_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooInt;
         return this;
       }
       public Builder ClearFooInt() {
         PrepareBuilder();
-        result.hasFooInt = false;
-        result.fooInt_ = 0;
+        if (result.fooCase_ == FooOneofCase.FooInt) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooString {
-        get { return result.hasFooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString; }
       }
       public string FooString {
-        get { return result.FooString; }
+        get { return result.fooCase_ == FooOneofCase.FooString ? (string) result.foo_ : ""; }
         set { SetFooString(value); }
       }
       public Builder SetFooString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooString = true;
-        result.fooString_ = value;
+        result.foo_ = value;
+        result.fooCase_ = FooOneofCase.FooString;
         return this;
       }
       public Builder ClearFooString() {
         PrepareBuilder();
-        result.hasFooString = false;
-        result.fooString_ = "";
+        if (result.fooCase_ == FooOneofCase.FooString) {
+          result.fooCase_ = FooOneofCase.None;
+        }
         return this;
       }
 
       public bool HasFooMessage {
-       get { return result.hasFooMessage; }
+       get { return result.fooCase_ == FooOneofCase.FooMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage FooMessage {
-        get { return result.FooMessage; }
+        get { return result.fooCase_ == FooOneofCase.FooMessage ? (global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage) result.foo_ : global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance; }
         set { SetFooMessage(value); }
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = value;
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = value;
         return this;
       }
       public Builder SetFooMessage(global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasFooMessage = true;
-        result.fooMessage_ = builderForValue.Build();
+        result.fooCase_ = FooOneofCase.FooMessage;
+        result.foo_ = builderForValue.Build();
         return this;
       }
       public Builder MergeFooMessage(global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasFooMessage &&
-            result.fooMessage_ != global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance) {
-            result.fooMessage_ = global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.CreateBuilder(result.fooMessage_).MergeFrom(value).BuildPartial();
+        if (result.fooCase_ == FooOneofCase.FooMessage &&
+            result.FooMessage != global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.DefaultInstance) {
+          result.foo_ = global::Google.ProtocolBuffers.TestProtos.TestRequiredOneof.Types.NestedMessage.CreateBuilder(result.FooMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.fooMessage_ = value;
+          result.foo_ = value;
         }
-        result.hasFooMessage = true;
+        result.fooCase_ = FooOneofCase.FooMessage;
         return this;
       }
       public Builder ClearFooMessage() {
+        if (result.fooCase_ == FooOneofCase.FooMessage) {
+          PrepareBuilder();
+          result.fooCase_ = FooOneofCase.None;
+          result.foo_ = null;
+        }
+        return this;
+      }
+
+      public FooOneofCase FooCase {
+        get { return result.fooCase_; }
+      }
+      public Builder ClearFoo() {
         PrepareBuilder();
-        result.hasFooMessage = false;
-        result.fooMessage_ = null;
+        result.foo_ = null;
+        result.fooCase_ = FooOneofCase.None;
         return this;
       }
     }
diff --git a/csharp/src/ProtocolBuffersLite.Test/TestProtos/UnittestLite.cs b/csharp/src/ProtocolBuffersLite.Test/TestProtos/UnittestLite.cs
index e6cc2adb..84860b69 100644
--- a/csharp/src/ProtocolBuffersLite.Test/TestProtos/UnittestLite.cs
+++ b/csharp/src/ProtocolBuffersLite.Test/TestProtos/UnittestLite.cs
@@ -1971,6 +1971,19 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
     #endregion
 
+    private object oneofField_;
+    public enum OneofFieldOneofCase {
+      OneofUint32 = 111,
+      OneofNestedMessage = 112,
+      OneofString = 113,
+      OneofBytes = 114,
+      None = 0,
+    }
+    private OneofFieldOneofCase oneofFieldCase_ = OneofFieldOneofCase.None;
+    public OneofFieldOneofCase OneofFieldCase {
+      get { return oneofFieldCase_; }
+    }
+
     public const int OptionalInt32FieldNumber = 1;
     private bool hasOptionalInt32;
     private int optionalInt32_;
@@ -2732,43 +2745,35 @@ namespace Google.ProtocolBuffers.TestProtos {
     }
 
     public const int OneofUint32FieldNumber = 111;
-    private bool hasOneofUint32;
-    private uint oneofUint32_;
     public bool HasOneofUint32 {
-      get { return hasOneofUint32; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofUint32; }
     }
     public uint OneofUint32 {
-      get { return oneofUint32_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofUint32 ? (uint) oneofField_ : 0; }
     }
 
     public const int OneofNestedMessageFieldNumber = 112;
-    private bool hasOneofNestedMessage;
-    private global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage oneofNestedMessage_;
     public bool HasOneofNestedMessage {
-      get { return hasOneofNestedMessage; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage; }
     }
     public global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage OneofNestedMessage {
-      get { return oneofNestedMessage_ ?? global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.DefaultInstance; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage) oneofField_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.DefaultInstance; }
     }
 
     public const int OneofStringFieldNumber = 113;
-    private bool hasOneofString;
-    private string oneofString_ = "";
     public bool HasOneofString {
-      get { return hasOneofString; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofString; }
     }
     public string OneofString {
-      get { return oneofString_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofString ? (string) oneofField_ : ""; }
     }
 
     public const int OneofBytesFieldNumber = 114;
-    private bool hasOneofBytes;
-    private pb::ByteString oneofBytes_ = pb::ByteString.Empty;
     public bool HasOneofBytes {
-      get { return hasOneofBytes; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofBytes; }
     }
     public pb::ByteString OneofBytes {
-      get { return oneofBytes_; }
+      get { return oneofFieldCase_ == OneofFieldOneofCase.OneofBytes ? (pb::ByteString) oneofField_ : pb::ByteString.Empty; }
     }
 
     public override bool IsInitialized {
@@ -2993,16 +2998,16 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasDefaultCord) {
         output.WriteString(85, field_names[2], DefaultCord);
       }
-      if (hasOneofUint32) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
         output.WriteUInt32(111, field_names[23], OneofUint32);
       }
-      if (hasOneofNestedMessage) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
         output.WriteMessage(112, field_names[21], OneofNestedMessage);
       }
-      if (hasOneofString) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
         output.WriteString(113, field_names[22], OneofString);
       }
-      if (hasOneofBytes) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
         output.WriteBytes(114, field_names[20], OneofBytes);
       }
     }
@@ -3326,16 +3331,16 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasDefaultCord) {
         size += pb::CodedOutputStream.ComputeStringSize(85, DefaultCord);
       }
-      if (hasOneofUint32) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
         size += pb::CodedOutputStream.ComputeUInt32Size(111, OneofUint32);
       }
-      if (hasOneofNestedMessage) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
         size += pb::CodedOutputStream.ComputeMessageSize(112, OneofNestedMessage);
       }
-      if (hasOneofString) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
         size += pb::CodedOutputStream.ComputeStringSize(113, OneofString);
       }
-      if (hasOneofBytes) {
+      if (oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
         size += pb::CodedOutputStream.ComputeBytesSize(114, OneofBytes);
       }
       memoizedSerializedSize = size;
@@ -3520,15 +3525,8 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasDefaultCord) {
         hash ^= defaultCord_.GetHashCode();
       }
-      if (hasOneofUint32) {
-        hash ^= oneofUint32_.GetHashCode();
-      }
-      if (hasOneofNestedMessage) hash ^= oneofNestedMessage_.GetHashCode();
-      if (hasOneofString) {
-        hash ^= oneofString_.GetHashCode();
-      }
-      if (hasOneofBytes) {
-        hash ^= oneofBytes_.GetHashCode();
+      if (oneofFieldCase_ != OneofFieldOneofCase.None) {
+        hash ^= oneofField_.GetHashCode();
       }
       return hash;
     }
@@ -3657,10 +3655,10 @@ namespace Google.ProtocolBuffers.TestProtos {
       if (hasDefaultImportEnum != other.hasDefaultImportEnum || (hasDefaultImportEnum && !defaultImportEnum_.Equals(other.defaultImportEnum_))) return false;
       if (hasDefaultStringPiece != other.hasDefaultStringPiece || (hasDefaultStringPiece && !defaultStringPiece_.Equals(other.defaultStringPiece_))) return false;
       if (hasDefaultCord != other.hasDefaultCord || (hasDefaultCord && !defaultCord_.Equals(other.defaultCord_))) return false;
-      if (hasOneofUint32 != other.hasOneofUint32 || (hasOneofUint32 && !oneofUint32_.Equals(other.oneofUint32_))) return false;
-      if (hasOneofNestedMessage != other.hasOneofNestedMessage || (hasOneofNestedMessage && !oneofNestedMessage_.Equals(other.oneofNestedMessage_))) return false;
-      if (hasOneofString != other.hasOneofString || (hasOneofString && !oneofString_.Equals(other.oneofString_))) return false;
-      if (hasOneofBytes != other.hasOneofBytes || (hasOneofBytes && !oneofBytes_.Equals(other.oneofBytes_))) return false;
+      if (!OneofUint32.Equals(other.OneofUint32)) return false;
+      if (!OneofNestedMessage.Equals(other.OneofNestedMessage)) return false;
+      if (!OneofString.Equals(other.OneofString)) return false;
+      if (!OneofBytes.Equals(other.OneofBytes)) return false;
       return true;
     }
 
@@ -3736,10 +3734,10 @@ namespace Google.ProtocolBuffers.TestProtos {
       PrintField("default_import_enum", hasDefaultImportEnum, defaultImportEnum_, writer);
       PrintField("default_string_piece", hasDefaultStringPiece, defaultStringPiece_, writer);
       PrintField("default_cord", hasDefaultCord, defaultCord_, writer);
-      PrintField("oneof_uint32", hasOneofUint32, oneofUint32_, writer);
-      PrintField("oneof_nested_message", hasOneofNestedMessage, oneofNestedMessage_, writer);
-      PrintField("oneof_string", hasOneofString, oneofString_, writer);
-      PrintField("oneof_bytes", hasOneofBytes, oneofBytes_, writer);
+      PrintField("oneof_uint32", oneofFieldCase_ == OneofFieldOneofCase.OneofUint32, oneofField_, writer);
+      PrintField("oneof_nested_message", oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage, oneofField_, writer);
+      PrintField("oneof_string", oneofFieldCase_ == OneofFieldOneofCase.OneofString, oneofField_, writer);
+      PrintField("oneof_bytes", oneofFieldCase_ == OneofFieldOneofCase.OneofBytes, oneofField_, writer);
     }
     #endregion
 
@@ -4095,17 +4093,24 @@ namespace Google.ProtocolBuffers.TestProtos {
         if (other.HasDefaultCord) {
           DefaultCord = other.DefaultCord;
         }
-        if (other.HasOneofUint32) {
-          OneofUint32 = other.OneofUint32;
-        }
-        if (other.HasOneofNestedMessage) {
-          MergeOneofNestedMessage(other.OneofNestedMessage);
-        }
-        if (other.HasOneofString) {
-          OneofString = other.OneofString;
-        }
-        if (other.HasOneofBytes) {
-          OneofBytes = other.OneofBytes;
+        switch (other.OneofFieldCase) {
+          case OneofFieldOneofCase.OneofUint32: {
+            SetOneofUint32(other.OneofUint32);
+            break;
+          }
+          case OneofFieldOneofCase.OneofNestedMessage: {
+            MergeOneofNestedMessage(other.OneofNestedMessage);
+            break;
+          }
+          case OneofFieldOneofCase.OneofString: {
+            SetOneofString(other.OneofString);
+            break;
+          }
+          case OneofFieldOneofCase.OneofBytes: {
+            SetOneofBytes(other.OneofBytes);
+            break;
+          }
+          case OneofFieldOneofCase.None: { break; }
         }
         return this;
       }
@@ -4497,24 +4502,37 @@ namespace Google.ProtocolBuffers.TestProtos {
               break;
             }
             case 888: {
-              result.hasOneofUint32 = input.ReadUInt32(ref result.oneofUint32_);
+              uint value = 0;
+              if (input.ReadUInt32(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofUint32;
+              }
               break;
             }
             case 898: {
               global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.Builder subBuilder = global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.CreateBuilder();
-              if (result.hasOneofNestedMessage) {
+              if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
                 subBuilder.MergeFrom(OneofNestedMessage);
               }
               input.ReadMessage(subBuilder, extensionRegistry);
-              OneofNestedMessage = subBuilder.BuildPartial();
+              result.oneofField_ = subBuilder.BuildPartial();
+              result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
               break;
             }
             case 906: {
-              result.hasOneofString = input.ReadString(ref result.oneofString_);
+              string value = "";
+              if (input.ReadString(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofString;
+              }
               break;
             }
             case 914: {
-              result.hasOneofBytes = input.ReadBytes(ref result.oneofBytes_);
+              pb::ByteString value = pb::ByteString.Empty;
+              if (input.ReadBytes(ref value)) {
+                result.oneofField_ = value;
+                result.oneofFieldCase_ = OneofFieldOneofCase.OneofBytes;
+              }
               break;
             }
           }
@@ -6401,104 +6419,119 @@ namespace Google.ProtocolBuffers.TestProtos {
       }
 
       public bool HasOneofUint32 {
-        get { return result.hasOneofUint32; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32; }
       }
       public uint OneofUint32 {
-        get { return result.OneofUint32; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32 ? (uint) result.oneofField_ : 0; }
         set { SetOneofUint32(value); }
       }
       public Builder SetOneofUint32(uint value) {
         PrepareBuilder();
-        result.hasOneofUint32 = true;
-        result.oneofUint32_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofUint32;
         return this;
       }
       public Builder ClearOneofUint32() {
         PrepareBuilder();
-        result.hasOneofUint32 = false;
-        result.oneofUint32_ = 0;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofUint32) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
         return this;
       }
 
       public bool HasOneofNestedMessage {
-       get { return result.hasOneofNestedMessage; }
+       get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage; }
       }
       public global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage OneofNestedMessage {
-        get { return result.OneofNestedMessage; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage ? (global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage) result.oneofField_ : global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.DefaultInstance; }
         set { SetOneofNestedMessage(value); }
       }
       public Builder SetOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofNestedMessage = true;
-        result.oneofNestedMessage_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
+        result.oneofField_ = value;
         return this;
       }
       public Builder SetOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.Builder builderForValue) {
         pb::ThrowHelper.ThrowIfNull(builderForValue, "builderForValue");
         PrepareBuilder();
-        result.hasOneofNestedMessage = true;
-        result.oneofNestedMessage_ = builderForValue.Build();
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
+        result.oneofField_ = builderForValue.Build();
         return this;
       }
       public Builder MergeOneofNestedMessage(global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        if (result.hasOneofNestedMessage &&
-            result.oneofNestedMessage_ != global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.DefaultInstance) {
-            result.oneofNestedMessage_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.CreateBuilder(result.oneofNestedMessage_).MergeFrom(value).BuildPartial();
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage &&
+            result.OneofNestedMessage != global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.DefaultInstance) {
+          result.oneofField_ = global::Google.ProtocolBuffers.TestProtos.TestAllTypesLite.Types.NestedMessage.CreateBuilder(result.OneofNestedMessage).MergeFrom(value).BuildPartial();
         } else {
-          result.oneofNestedMessage_ = value;
+          result.oneofField_ = value;
         }
-        result.hasOneofNestedMessage = true;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofNestedMessage;
         return this;
       }
       public Builder ClearOneofNestedMessage() {
-        PrepareBuilder();
-        result.hasOneofNestedMessage = false;
-        result.oneofNestedMessage_ = null;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofNestedMessage) {
+          PrepareBuilder();
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+          result.oneofField_ = null;
+        }
         return this;
       }
 
       public bool HasOneofString {
-        get { return result.hasOneofString; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofString; }
       }
       public string OneofString {
-        get { return result.OneofString; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofString ? (string) result.oneofField_ : ""; }
         set { SetOneofString(value); }
       }
       public Builder SetOneofString(string value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofString = true;
-        result.oneofString_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofString;
         return this;
       }
       public Builder ClearOneofString() {
         PrepareBuilder();
-        result.hasOneofString = false;
-        result.oneofString_ = "";
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofString) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
         return this;
       }
 
       public bool HasOneofBytes {
-        get { return result.hasOneofBytes; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofBytes; }
       }
       public pb::ByteString OneofBytes {
-        get { return result.OneofBytes; }
+        get { return result.oneofFieldCase_ == OneofFieldOneofCase.OneofBytes ? (pb::ByteString) result.oneofField_ : pb::ByteString.Empty; }
         set { SetOneofBytes(value); }
       }
       public Builder SetOneofBytes(pb::ByteString value) {
         pb::ThrowHelper.ThrowIfNull(value, "value");
         PrepareBuilder();
-        result.hasOneofBytes = true;
-        result.oneofBytes_ = value;
+        result.oneofField_ = value;
+        result.oneofFieldCase_ = OneofFieldOneofCase.OneofBytes;
         return this;
       }
       public Builder ClearOneofBytes() {
         PrepareBuilder();
-        result.hasOneofBytes = false;
-        result.oneofBytes_ = pb::ByteString.Empty;
+        if (result.oneofFieldCase_ == OneofFieldOneofCase.OneofBytes) {
+          result.oneofFieldCase_ = OneofFieldOneofCase.None;
+        }
+        return this;
+      }
+
+      public OneofFieldOneofCase OneofFieldCase {
+        get { return result.oneofFieldCase_; }
+      }
+      public Builder ClearOneofField() {
+        PrepareBuilder();
+        result.oneofField_ = null;
+        result.oneofFieldCase_ = OneofFieldOneofCase.None;
         return this;
       }
     }
diff --git a/src/google/protobuf/compiler/csharp/csharp_enum_field.cc b/src/google/protobuf/compiler/csharp/csharp_enum_field.cc
index 34d1c5c6..a2d8a98b 100644
--- a/src/google/protobuf/compiler/csharp/csharp_enum_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_enum_field.cc
@@ -49,6 +49,11 @@ namespace csharp {
 EnumFieldGenerator::EnumFieldGenerator(const FieldDescriptor* descriptor,
                                        int fieldOrdinal)
     : FieldGeneratorBase(descriptor, fieldOrdinal) {
+  if (SupportFieldPresence(descriptor_->file())) {
+    has_property_check = "has" + property_name();
+  } else {
+    has_property_check = property_name() + " != " + default_value();
+  }
 }
 
 EnumFieldGenerator::~EnumFieldGenerator() {
@@ -122,8 +127,7 @@ void EnumFieldGenerator::GenerateBuildingCode(Writer* writer) {
 
 void EnumFieldGenerator::GenerateParsingCode(Writer* writer) {
   writer->WriteLine("object unknown;");
-  writer->WriteLine("if(input.ReadEnum(ref result.$0$_, out unknown)) {",
-                    name());
+  writer->WriteLine("if(input.ReadEnum(ref result.$0$_, out unknown)) {", name());
   if (SupportFieldPresence(descriptor_->file())) {
     writer->WriteLine("  result.has$0$ = true;", property_name());
   }
@@ -141,11 +145,7 @@ void EnumFieldGenerator::GenerateParsingCode(Writer* writer) {
 }
 
 void EnumFieldGenerator::GenerateSerializationCode(Writer* writer) {
-  if (SupportFieldPresence(descriptor_->file())) {
-    writer->WriteLine("if (has$0$) {", property_name());
-  } else {
-    writer->WriteLine("if ($0$ != $1$) {", property_name(), default_value());
-  }
+  writer->WriteLine("if ($0$) {", has_property_check);
   writer->WriteLine(
       "  output.WriteEnum($0$, field_names[$2$], (int) $1$, $1$);", number(),
       property_name(), field_ordinal());
@@ -153,11 +153,7 @@ void EnumFieldGenerator::GenerateSerializationCode(Writer* writer) {
 }
 
 void EnumFieldGenerator::GenerateSerializedSizeCode(Writer* writer) {
-  if (SupportFieldPresence(descriptor_->file())) {
-    writer->WriteLine("if (has$0$) {", property_name());
-  } else {
-    writer->WriteLine("if ($0$ != $1$) {", property_name(), default_value());
-  }
+  writer->WriteLine("if ($0$) {", has_property_check);
   writer->WriteLine(
       "  size += pb::CodedOutputStream.ComputeEnumSize($0$, (int) $1$);",
       number(), property_name());
@@ -165,11 +161,7 @@ void EnumFieldGenerator::GenerateSerializedSizeCode(Writer* writer) {
 }
 
 void EnumFieldGenerator::WriteHash(Writer* writer) {
-  if (SupportFieldPresence(descriptor_->file())) {
-    writer->WriteLine("if (has$0$) {", property_name());
-  } else {
-    writer->WriteLine("if ($0$ != $1$) {", property_name(), default_value());
-  }
+  writer->WriteLine("if ($0$) {", has_property_check);
   writer->WriteLine("  hash ^= $0$_.GetHashCode();", name());
   writer->WriteLine("}");
 }
@@ -184,13 +176,94 @@ void EnumFieldGenerator::WriteEquals(Writer* writer) {
   }
 }
 void EnumFieldGenerator::WriteToString(Writer* writer) {
+  writer->WriteLine("PrintField(\"$0$\", $1$, $2$_, writer);",
+                    descriptor_->name(), has_property_check, name());
+}
+
+EnumOneofFieldGenerator::EnumOneofFieldGenerator(const FieldDescriptor* descriptor,
+						 int fieldOrdinal)
+  : EnumFieldGenerator(descriptor, fieldOrdinal) {
+  has_property_check = oneof_name() + "Case_ == " + oneof_property_name() +
+    "OneofCase." + property_name();
+}
+
+EnumOneofFieldGenerator::~EnumOneofFieldGenerator() {
+}
+
+void EnumOneofFieldGenerator::GenerateMembers(Writer* writer) {
+  AddDeprecatedFlag(writer);
   if (SupportFieldPresence(descriptor_->file())) {
-    writer->WriteLine("PrintField(\"$0$\", has$1$, $2$_, writer);",
-                      descriptor_->name(), property_name(), name());
-  } else {
-    writer->WriteLine("PrintField(\"$0$\", $1$_, writer);",
-                      descriptor_->name(), name());
+    writer->WriteLine("public bool Has$0$ {", property_name());
+    writer->WriteLine("  get { return $0$; }", has_property_check);
+    writer->WriteLine("}");
+  }
+  AddPublicMemberAttributes(writer);
+  writer->WriteLine("public $0$ $1$ {", type_name(), property_name());
+  writer->WriteLine("  get { return $0$ ? ($1$) $2$_ : $3$; }",
+		    has_property_check, type_name(), oneof_name(), default_value());
+  writer->WriteLine("}");
+}
+
+void EnumOneofFieldGenerator::GenerateBuilderMembers(Writer* writer) {
+  AddDeprecatedFlag(writer);
+  if (SupportFieldPresence(descriptor_->file())) {
+    writer->WriteLine("public bool Has$0$ {", property_name());
+    writer->WriteLine(" get { return result.$0$; }", has_property_check);
+    writer->WriteLine("}");
   }
+  AddPublicMemberAttributes(writer);
+  writer->WriteLine("public $0$ $1$ {", type_name(), property_name());
+  writer->WriteLine("  get { return result.$0$ ? ($1$) result.$2$_ : $3$; }",
+		    has_property_check, type_name(), oneof_name(), default_value());
+  writer->WriteLine("  set { Set$0$(value); }", property_name());
+  writer->WriteLine("}");
+  AddPublicMemberAttributes(writer);
+  writer->WriteLine("public Builder Set$0$($1$ value) {", property_name(),
+                    type_name());
+  writer->WriteLine("  PrepareBuilder();");
+  writer->WriteLine("  result.$0$_ = value;", oneof_name());
+  writer->WriteLine("  result.$0$Case_ = $1$OneofCase.$2$;",
+                    oneof_name(), oneof_property_name(), property_name());
+  writer->WriteLine("  return this;");
+  writer->WriteLine("}");
+  AddDeprecatedFlag(writer);
+  writer->WriteLine("public Builder Clear$0$() {", property_name());
+  writer->WriteLine("  PrepareBuilder();");
+  writer->WriteLine("  if (result.$0$) {", has_property_check);
+  writer->WriteLine("    result.$0$Case_ = $1$OneofCase.None;",
+                    oneof_name(), oneof_property_name());
+  writer->WriteLine("  }");
+  writer->WriteLine("  return this;");
+  writer->WriteLine("}");
+}
+
+void EnumOneofFieldGenerator::WriteEquals(Writer* writer) {
+  writer->WriteLine("if (!$0$.Equals(other.$0$)) return false;", property_name());
+}
+void EnumOneofFieldGenerator::WriteToString(Writer* writer) {
+  writer->WriteLine("PrintField(\"$0$\", $1$, $2$_, writer);",
+                    descriptor_->name(), has_property_check, oneof_name());
+}
+
+void EnumOneofFieldGenerator::GenerateParsingCode(Writer* writer) {
+  writer->WriteLine("object unknown;");
+  writer->WriteLine("$0$ enumValue = $1$;", type_name(), default_value());
+  writer->WriteLine("if(input.ReadEnum(ref enumValue, out unknown)) {",
+                    name());
+  writer->WriteLine("  result.$0$_ = enumValue;", oneof_name());
+  writer->WriteLine("  result.$0$Case_ = $1$OneofCase.$2$;",
+		    oneof_name(), oneof_property_name(), property_name());
+  writer->WriteLine("} else if(unknown is int) {");
+  if (!use_lite_runtime()) {
+    writer->WriteLine("  if (unknownFields == null) {");  // First unknown field - create builder now
+    writer->WriteLine(
+        "    unknownFields = pb::UnknownFieldSet.CreateBuilder(this.UnknownFields);");
+    writer->WriteLine("  }");
+    writer->WriteLine(
+        "  unknownFields.MergeVarintField($0$, (ulong)(int)unknown);",
+        number());
+  }
+  writer->WriteLine("}");
 }
 
 }  // namespace csharp
diff --git a/src/google/protobuf/compiler/csharp/csharp_enum_field.h b/src/google/protobuf/compiler/csharp/csharp_enum_field.h
index b21fa9dc..565287b2 100644
--- a/src/google/protobuf/compiler/csharp/csharp_enum_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_enum_field.h
@@ -60,10 +60,28 @@ class EnumFieldGenerator : public FieldGeneratorBase {
   virtual void WriteEquals(Writer* writer);
   virtual void WriteToString(Writer* writer);
 
+ protected:
+  string has_property_check;
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumFieldGenerator);
 };
 
+class EnumOneofFieldGenerator : public EnumFieldGenerator {
+ public:
+  EnumOneofFieldGenerator(const FieldDescriptor* descriptor, int fieldOrdinal);
+  ~EnumOneofFieldGenerator();
+
+  virtual void GenerateMembers(Writer* writer);
+  virtual void GenerateBuilderMembers(Writer* writer);
+  virtual void WriteEquals(Writer* writer);
+  virtual void WriteToString(Writer* writer);
+  virtual void GenerateParsingCode(Writer* writer);
+
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(EnumOneofFieldGenerator);
+};
+
 }  // namespace csharp
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/csharp/csharp_field_base.cc b/src/google/protobuf/compiler/csharp/csharp_field_base.cc
index 145b6743..dfc803e6 100644
--- a/src/google/protobuf/compiler/csharp/csharp_field_base.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_field_base.cc
@@ -81,6 +81,14 @@ void FieldGeneratorBase::AddPublicMemberAttributes(Writer* writer) {
   AddDeprecatedFlag(writer);
 }
 
+std::string FieldGeneratorBase::oneof_property_name() {
+  return UnderscoresToCamelCase(descriptor_->containing_oneof()->name(), true);
+}
+
+std::string FieldGeneratorBase::oneof_name() {
+  return UnderscoresToCamelCase(descriptor_->containing_oneof()->name(), false);
+}
+
 std::string FieldGeneratorBase::property_name() {
   return GetPropertyName(descriptor_);
 }
diff --git a/src/google/protobuf/compiler/csharp/csharp_field_base.h b/src/google/protobuf/compiler/csharp/csharp_field_base.h
index 311f7a6e..312da12b 100644
--- a/src/google/protobuf/compiler/csharp/csharp_field_base.h
+++ b/src/google/protobuf/compiler/csharp/csharp_field_base.h
@@ -71,6 +71,8 @@ class FieldGeneratorBase : public SourceGeneratorBase {
 
   void AddPublicMemberAttributes(Writer* writer);
 
+  std::string oneof_property_name();
+  std::string oneof_name();
   std::string property_name();
   std::string name();
   std::string type_name();
diff --git a/src/google/protobuf/compiler/csharp/csharp_helpers.cc b/src/google/protobuf/compiler/csharp/csharp_helpers.cc
index 4580b7be..76e2c850 100644
--- a/src/google/protobuf/compiler/csharp/csharp_helpers.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_helpers.cc
@@ -346,19 +346,31 @@ FieldGeneratorBase* CreateFieldGenerator(const FieldDescriptor* descriptor,
       if (descriptor->is_repeated()) {
         return new RepeatedMessageFieldGenerator(descriptor, fieldOrdinal);
       } else {
-        return new MessageFieldGenerator(descriptor, fieldOrdinal);
+	if (descriptor->containing_oneof()) {
+	  return new MessageOneofFieldGenerator(descriptor, fieldOrdinal);
+	} else {
+	  return new MessageFieldGenerator(descriptor, fieldOrdinal);
+	}
       }
     case FieldDescriptor::TYPE_ENUM:
       if (descriptor->is_repeated()) {
         return new RepeatedEnumFieldGenerator(descriptor, fieldOrdinal);
       } else {
-        return new EnumFieldGenerator(descriptor, fieldOrdinal);
+	if (descriptor->containing_oneof()) {
+	  return new EnumOneofFieldGenerator(descriptor, fieldOrdinal);
+	} else {
+	  return new EnumFieldGenerator(descriptor, fieldOrdinal);
+	}
       }
     default:
       if (descriptor->is_repeated()) {
         return new RepeatedPrimitiveFieldGenerator(descriptor, fieldOrdinal);
       } else {
-        return new PrimitiveFieldGenerator(descriptor, fieldOrdinal);
+	if (descriptor->containing_oneof()) {
+	  return new PrimitiveOneofFieldGenerator(descriptor, fieldOrdinal);
+	} else {
+	  return new PrimitiveFieldGenerator(descriptor, fieldOrdinal);
+	}
       }
   }
 }
diff --git a/src/google/protobuf/compiler/csharp/csharp_message.cc b/src/google/protobuf/compiler/csharp/csharp_message.cc
index 96f7c17c..22681235 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_message.cc
@@ -156,6 +156,10 @@ void MessageGenerator::GenerateStaticVariableInitializers(Writer* writer) {
     for (int i = 0; i < descriptor_->field_count(); i++) {
       writer->Write("\"$0$\", ", GetPropertyName(descriptor_->field(i)));
     }
+    for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
+      writer->Write("\"$0$\", ",
+		    UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), true));
+    }
     writer->WriteLine("});");
   }
 
@@ -260,6 +264,31 @@ void MessageGenerator::Generate(Writer* writer) {
     writer->WriteLine();
   }
 
+  // oneof
+  for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
+    string name = UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), false);
+    string property_name = UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), true);
+    writer->WriteLine("private object $0$_;", name);
+    writer->WriteLine("public enum $0$OneofCase {", property_name);
+    writer->Indent();
+    for (int j = 0; j < descriptor_->oneof_decl(i)->field_count(); j++) {
+      const FieldDescriptor* field = descriptor_->oneof_decl(i)->field(j);
+      writer->WriteLine("$0$ = $1$,",
+			GetPropertyName(field),
+			SimpleItoa(field->number()));
+    }
+    writer->WriteLine("None = 0,");
+    writer->Outdent();
+    writer->WriteLine("}");
+    writer->WriteLine("private $0$OneofCase $1$Case_ = $0$OneofCase.None;",
+		      property_name, name);
+    writer->WriteLine("public $0$OneofCase $0$Case {", property_name);
+    writer->WriteLine("  get { return $0$Case_; }", name);
+    writer->WriteLine("}");
+    writer->WriteLine();
+  }
+
+  // Fields
   for (int i = 0; i < descriptor_->field_count(); i++) {
     const FieldDescriptor* fieldDescriptor = descriptor_->field(i);
 
@@ -310,9 +339,19 @@ void MessageGenerator::GenerateLiteRuntimeMethods(Writer* writer) {
   writer->Indent();
   writer->WriteLine("int hash = GetType().GetHashCode();");
   for (int i = 0; i < descriptor_->field_count(); i++) {
-    scoped_ptr<FieldGeneratorBase> generator(
-        CreateFieldGeneratorInternal(descriptor_->field(i)));
-    generator->WriteHash(writer);
+    const FieldDescriptor* field = descriptor_->field(i);
+    if (field->containing_oneof() == NULL) {
+      scoped_ptr<FieldGeneratorBase> generator(
+          CreateFieldGeneratorInternal(field));
+      generator->WriteHash(writer);
+    }
+  }
+  for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
+    string name = UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), false);
+    string property_name = UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), true);
+    writer->WriteLine("if ($0$Case_ != $1$OneofCase.None) {", name, property_name);
+    writer->WriteLine("  hash ^= $0$_.GetHashCode();", name);
+    writer->WriteLine("}");
   }
   if (callbase) {
     writer->WriteLine("hash ^= base.GetHashCode();");
@@ -577,6 +616,23 @@ void MessageGenerator::GenerateBuilder(Writer* writer) {
     // No field comment :(
     generator->GenerateBuilderMembers(writer);
   }
+
+  // oneof
+  for (int i = 0; i < descriptor_->oneof_decl_count(); i++) {
+    writer->WriteLine();
+    string name = UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), false);
+    string property_name = UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), true);
+    writer->WriteLine("public $0$OneofCase $0$Case {", property_name);
+    writer->WriteLine("  get { return result.$0$Case_; }", name);
+    writer->WriteLine("}");
+    writer->WriteLine("public Builder Clear$0$() {", property_name);
+    writer->WriteLine("  PrepareBuilder();");
+    writer->WriteLine("  result.$0$_ = null;", name);
+    writer->WriteLine("  result.$0$Case_ = $1$OneofCase.None;", name, property_name);
+    writer->WriteLine("  return this;");
+    writer->WriteLine("}");
+  }
+
   writer->Outdent();
   writer->WriteLine("}");
 }
@@ -675,10 +731,37 @@ void MessageGenerator::GenerateCommonBuilderMethods(Writer* writer) {
                       full_class_name());
     writer->WriteLine("PrepareBuilder();");
     for (int i = 0; i < descriptor_->field_count(); i++) {
-      scoped_ptr<FieldGeneratorBase> generator(
-          CreateFieldGeneratorInternal(descriptor_->field(i)));
-      generator->GenerateMergingCode(writer);
+      if (!descriptor_->field(i)->containing_oneof()) {
+	scoped_ptr<FieldGeneratorBase> generator(
+	  CreateFieldGeneratorInternal(descriptor_->field(i)));
+	generator->GenerateMergingCode(writer);
+      }
+     }
+
+    // Merge oneof fields
+    for (int i = 0; i < descriptor_->oneof_decl_count(); ++i) {
+      string name = UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), false);
+      string property_name = UnderscoresToCamelCase(descriptor_->oneof_decl(i)->name(), true);
+      writer->WriteLine("switch (other.$0$Case) {", property_name);
+      writer->Indent();
+      for (int j = 0; j < descriptor_->oneof_decl(i)->field_count(); j++) {
+        const FieldDescriptor* field = descriptor_->oneof_decl(i)->field(j);
+	writer->WriteLine("case $0$OneofCase.$1$: {",
+          property_name, GetPropertyName(field));
+	if (field->type() == FieldDescriptor::TYPE_GROUP ||
+	    field->type() == FieldDescriptor::TYPE_MESSAGE) {
+	  writer->WriteLine("  Merge$0$(other.$0$);", GetPropertyName(field));
+	} else {
+	  writer->WriteLine("  Set$0$(other.$0$);", GetPropertyName(field));
+	}
+        writer->WriteLine("  break;");
+	writer->WriteLine("}");
+      }
+      writer->WriteLine("case $0$OneofCase.None: { break; }", property_name);
+      writer->Outdent();
+      writer->WriteLine("}");
     }
+
     // if message type has extensions
     if (descriptor_->extension_range_count() > 0) {
       writer->WriteLine("  this.MergeExtensionFields(other);");
diff --git a/src/google/protobuf/compiler/csharp/csharp_message_field.cc b/src/google/protobuf/compiler/csharp/csharp_message_field.cc
index 10464c4b..b533d735 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_message_field.cc
@@ -50,6 +50,7 @@ namespace csharp {
 MessageFieldGenerator::MessageFieldGenerator(const FieldDescriptor* descriptor,
                                              int fieldOrdinal)
     : FieldGeneratorBase(descriptor, fieldOrdinal) {
+  has_property_check = "has" + property_name();
 }
 
 MessageFieldGenerator::~MessageFieldGenerator() {
@@ -149,7 +150,7 @@ void MessageFieldGenerator::GenerateParsingCode(Writer* writer) {
 }
 
 void MessageFieldGenerator::GenerateSerializationCode(Writer* writer) {
-  writer->WriteLine("if (has$0$) {", property_name());
+  writer->WriteLine("if ($0$) {", has_property_check);
   writer->WriteLine("  output.Write$0$($1$, field_names[$3$], $2$);",
                     message_or_group(), number(), property_name(),
                     field_ordinal());
@@ -157,7 +158,7 @@ void MessageFieldGenerator::GenerateSerializationCode(Writer* writer) {
 }
 
 void MessageFieldGenerator::GenerateSerializedSizeCode(Writer* writer) {
-  writer->WriteLine("if (has$0$) {", property_name());
+  writer->WriteLine("if ($0$) {", has_property_check);
   writer->WriteLine("  size += pb::CodedOutputStream.Compute$0$Size($1$, $2$);",
                     message_or_group(), number(), property_name());
   writer->WriteLine("}");
@@ -177,6 +178,119 @@ void MessageFieldGenerator::WriteToString(Writer* writer) {
                     property_name(), name(), GetFieldName(descriptor_));
 }
 
+MessageOneofFieldGenerator::MessageOneofFieldGenerator(const FieldDescriptor* descriptor,
+						       int fieldOrdinal)
+    : MessageFieldGenerator(descriptor, fieldOrdinal) {
+  has_property_check = oneof_name() + "Case_ == " + oneof_property_name() +
+    "OneofCase." + property_name();
+}
+
+MessageOneofFieldGenerator::~MessageOneofFieldGenerator() {
+
+}
+
+void MessageOneofFieldGenerator::GenerateMembers(Writer* writer) {
+  if (SupportFieldPresence(descriptor_->file())) {
+    AddDeprecatedFlag(writer);
+    writer->WriteLine("public bool Has$0$ {", property_name());
+    writer->WriteLine("  get { return $0$; }", has_property_check);
+    writer->WriteLine("}");
+  }
+  AddDeprecatedFlag(writer);
+  writer->WriteLine("public $0$ $1$ {", type_name(), property_name());
+  writer->WriteLine("  get { return $0$ ? ($1$) $2$_ : $3$; }",
+		    has_property_check, type_name(), oneof_name(), default_value());
+  writer->WriteLine("}");
+}
+
+void MessageOneofFieldGenerator::GenerateBuilderMembers(Writer* writer) {
+  if (SupportFieldPresence(descriptor_->file())) {
+    AddDeprecatedFlag(writer);
+    writer->WriteLine("public bool Has$0$ {", property_name());
+    writer->WriteLine(" get { return result.$0$; }", has_property_check);
+    writer->WriteLine("}");
+  }
+  AddDeprecatedFlag(writer);
+  writer->WriteLine("public $0$ $1$ {", type_name(), property_name());
+  writer->WriteLine("  get { return result.$0$ ? ($1$) result.$2$_ : $3$; }",
+		    has_property_check, type_name(), oneof_name(), default_value());
+  writer->WriteLine("  set { Set$0$(value); }", property_name());
+  writer->WriteLine("}");
+  AddDeprecatedFlag(writer);
+  writer->WriteLine("public Builder Set$0$($1$ value) {", property_name(),
+                    type_name());
+  AddNullCheck(writer);
+  writer->WriteLine("  PrepareBuilder();");
+  writer->WriteLine("  result.$0$Case_ = $1$OneofCase.$2$;",
+		    oneof_name(), oneof_property_name(), property_name());
+  writer->WriteLine("  result.$0$_ = value;", oneof_name());
+  writer->WriteLine("  return this;");
+  writer->WriteLine("}");
+  AddDeprecatedFlag(writer);
+  writer->WriteLine("public Builder Set$0$($1$.Builder builderForValue) {",
+                    property_name(), type_name());
+  AddNullCheck(writer, "builderForValue");
+  writer->WriteLine("  PrepareBuilder();");
+  writer->WriteLine("  result.$0$Case_ = $1$OneofCase.$2$;",
+		    oneof_name(), oneof_property_name(), property_name());
+  writer->WriteLine("  result.$0$_ = builderForValue.Build();", oneof_name());
+  writer->WriteLine("  return this;");
+  writer->WriteLine("}");
+  AddDeprecatedFlag(writer);
+  writer->WriteLine("public Builder Merge$0$($1$ value) {", property_name(),
+                    type_name());
+  AddNullCheck(writer);
+  writer->WriteLine("  PrepareBuilder();");
+  writer->WriteLine("  if (result.$0$ &&", has_property_check);
+  writer->WriteLine("      result.$0$ != $1$) {", property_name(), default_value());
+  writer->WriteLine(
+      "    result.$0$_ = $1$.CreateBuilder(result.$2$).MergeFrom(value).BuildPartial();",
+      oneof_name(), type_name(), property_name());
+  writer->WriteLine("  } else {");
+  writer->WriteLine("    result.$0$_ = value;", oneof_name());
+  writer->WriteLine("  }");
+  writer->WriteLine("  result.$0$Case_ = $1$OneofCase.$2$;",
+		    oneof_name(), oneof_property_name(), property_name());
+  writer->WriteLine("  return this;");
+  writer->WriteLine("}");
+  AddDeprecatedFlag(writer);
+  writer->WriteLine("public Builder Clear$0$() {", property_name());
+  writer->WriteLine("  if (result.$0$) {", has_property_check);
+  writer->WriteLine("    PrepareBuilder();");
+  writer->WriteLine("    result.$0$Case_ = $1$OneofCase.None;",
+		    oneof_name(), oneof_property_name());
+  writer->WriteLine("    result.$0$_ = null;", oneof_name());
+  writer->WriteLine("  }");
+  writer->WriteLine("  return this;");
+  writer->WriteLine("}");
+}
+
+void MessageOneofFieldGenerator::GenerateParsingCode(Writer* writer) {
+  writer->WriteLine("$0$.Builder subBuilder = $0$.CreateBuilder();",
+                    type_name());
+  writer->WriteLine("if (result.$0$) {", has_property_check);
+  writer->WriteLine("  subBuilder.MergeFrom($0$);", property_name());
+  writer->WriteLine("}");
+
+  if (descriptor_->type() == FieldDescriptor::TYPE_GROUP) {
+    writer->WriteLine("input.ReadGroup($0$, subBuilder, extensionRegistry);",
+                      number());
+  } else {
+    writer->WriteLine("input.ReadMessage(subBuilder, extensionRegistry);");
+  }
+  writer->WriteLine("result.$0$_ = subBuilder.BuildPartial();", oneof_name());
+  writer->WriteLine("result.$0$Case_ = $1$OneofCase.$2$;",
+		    oneof_name(), oneof_property_name(), property_name());
+}
+
+void MessageOneofFieldGenerator::WriteEquals(Writer* writer) {
+  writer->WriteLine("if (!$0$.Equals(other.$0$)) return false;", property_name());
+}
+void MessageOneofFieldGenerator::WriteToString(Writer* writer) {
+  writer->WriteLine("PrintField(\"$0$\", $1$, $2$_, writer);",
+                    descriptor_->name(), has_property_check, oneof_name());
+}
+
 }  // namespace csharp
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/csharp/csharp_message_field.h b/src/google/protobuf/compiler/csharp/csharp_message_field.h
index 48bf8be5..d455ade5 100644
--- a/src/google/protobuf/compiler/csharp/csharp_message_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_message_field.h
@@ -60,10 +60,28 @@ class MessageFieldGenerator : public FieldGeneratorBase {
   virtual void WriteEquals(Writer* writer);
   virtual void WriteToString(Writer* writer);
 
+ protected:
+  string has_property_check;
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageFieldGenerator);
 };
 
+class MessageOneofFieldGenerator : public MessageFieldGenerator {
+ public:
+  MessageOneofFieldGenerator(const FieldDescriptor* descriptor, int fieldOrdinal);
+  ~MessageOneofFieldGenerator();
+
+  virtual void GenerateMembers(Writer* writer);
+  virtual void GenerateBuilderMembers(Writer* writer);
+  virtual void WriteEquals(Writer* writer);
+  virtual void WriteToString(Writer* writer);
+  virtual void GenerateParsingCode(Writer* writer);
+
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MessageOneofFieldGenerator);
+};
+
 }  // namespace csharp
 }  // namespace compiler
 }  // namespace protobuf
diff --git a/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc b/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc
index a193afda..a54edfe3 100644
--- a/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_primitive_field.cc
@@ -50,6 +50,11 @@ namespace csharp {
 PrimitiveFieldGenerator::PrimitiveFieldGenerator(
     const FieldDescriptor* descriptor, int fieldOrdinal)
     : FieldGeneratorBase(descriptor, fieldOrdinal) {
+  if (SupportFieldPresence(descriptor_->file())) {
+    has_property_check = "has" + property_name();
+  } else {
+    has_property_check = property_name() + " != " + default_value();
+  }
 }
 
 PrimitiveFieldGenerator::~PrimitiveFieldGenerator() {
@@ -133,11 +138,7 @@ void PrimitiveFieldGenerator::GenerateParsingCode(Writer* writer) {
 }
 
 void PrimitiveFieldGenerator::GenerateSerializationCode(Writer* writer) {
-  if (SupportFieldPresence(descriptor_->file())) {
-    writer->WriteLine("if (has$0$) {", property_name());
-  } else {
-    writer->WriteLine("if ($0$ != $1$) {", property_name(), default_value());
-  }
+  writer->WriteLine("if ($0$) {", has_property_check);
   writer->WriteLine("  output.Write$0$($1$, field_names[$3$], $2$);",
                     capitalized_type_name(), number(), property_name(),
                     field_ordinal());
@@ -145,22 +146,14 @@ void PrimitiveFieldGenerator::GenerateSerializationCode(Writer* writer) {
 }
 
 void PrimitiveFieldGenerator::GenerateSerializedSizeCode(Writer* writer) {
-  if (SupportFieldPresence(descriptor_->file())) {
-    writer->WriteLine("if (has$0$) {", property_name());
-  } else {
-    writer->WriteLine("if ($0$ != $1$) {", property_name(), default_value());
-  }
+  writer->WriteLine("if ($0$) {", has_property_check);
   writer->WriteLine("  size += pb::CodedOutputStream.Compute$0$Size($1$, $2$);",
                     capitalized_type_name(), number(), property_name());
   writer->WriteLine("}");
 }
 
 void PrimitiveFieldGenerator::WriteHash(Writer* writer) {
-  if (SupportFieldPresence(descriptor_->file())) {
-    writer->WriteLine("if (has$0$) {", property_name());
-  } else {
-    writer->WriteLine("if ($0$ != $1$) {", property_name(), default_value());
-  }
+  writer->WriteLine("if ($0$) {", has_property_check);
   writer->WriteLine("  hash ^= $0$_.GetHashCode();", name());
   writer->WriteLine("}");
 }
@@ -175,13 +168,84 @@ void PrimitiveFieldGenerator::WriteEquals(Writer* writer) {
   }
 }
 void PrimitiveFieldGenerator::WriteToString(Writer* writer) {
+  writer->WriteLine("PrintField(\"$0$\", $1$, $2$_, writer);",
+                    descriptor_->name(), has_property_check, name());
+}
+
+PrimitiveOneofFieldGenerator::PrimitiveOneofFieldGenerator(
+    const FieldDescriptor* descriptor, int fieldOrdinal)
+    : PrimitiveFieldGenerator(descriptor, fieldOrdinal) {
+  has_property_check = oneof_name() + "Case_ == " + oneof_property_name() +
+    "OneofCase." + property_name();
+}
+
+PrimitiveOneofFieldGenerator::~PrimitiveOneofFieldGenerator() {
+}
+
+void PrimitiveOneofFieldGenerator::GenerateMembers(Writer* writer) {
+  AddDeprecatedFlag(writer);
   if (SupportFieldPresence(descriptor_->file())) {
-    writer->WriteLine("PrintField(\"$0$\", has$1$, $2$_, writer);",
-                      descriptor_->name(), property_name(), name());
-  } else {
-    writer->WriteLine("PrintField(\"$0$\", $1$_, writer);",
-                      descriptor_->name(), name());
+    writer->WriteLine("public bool Has$0$ {", property_name());
+    writer->WriteLine("  get { return $0$; }", has_property_check);
+    writer->WriteLine("}");
   }
+  AddPublicMemberAttributes(writer);
+  writer->WriteLine("public $0$ $1$ {", type_name(), property_name());
+  writer->WriteLine("  get { return $0$ ? ($1$) $2$_ : $3$; }",
+		    has_property_check, type_name(), oneof_name(), default_value());
+  writer->WriteLine("}");
+}
+
+void PrimitiveOneofFieldGenerator::GenerateBuilderMembers(Writer* writer) {
+  AddDeprecatedFlag(writer);
+  if (SupportFieldPresence(descriptor_->file())) {
+    writer->WriteLine("public bool Has$0$ {", property_name());
+    writer->WriteLine("  get { return result.$0$; }", has_property_check);
+    writer->WriteLine("}");
+  }
+  AddPublicMemberAttributes(writer);
+  writer->WriteLine("public $0$ $1$ {", type_name(), property_name());
+  writer->WriteLine("  get { return result.$0$ ? ($1$) result.$2$_ : $3$; }",
+		    has_property_check, type_name(), oneof_name(), default_value());
+  writer->WriteLine("  set { Set$0$(value); }", property_name());
+  writer->WriteLine("}");
+  AddPublicMemberAttributes(writer);
+  writer->WriteLine("public Builder Set$0$($1$ value) {", property_name(),
+                    type_name());
+  AddNullCheck(writer);
+  writer->WriteLine("  PrepareBuilder();");
+  writer->WriteLine("  result.$0$_ = value;", oneof_name());
+  writer->WriteLine("  result.$0$Case_ = $1$OneofCase.$2$;",
+                    oneof_name(), oneof_property_name(), property_name());
+  writer->WriteLine("  return this;");
+  writer->WriteLine("}");
+  AddDeprecatedFlag(writer);
+  writer->WriteLine("public Builder Clear$0$() {", property_name());
+  writer->WriteLine("  PrepareBuilder();");
+  writer->WriteLine("  if (result.$0$) {", has_property_check);
+  writer->WriteLine("    result.$0$Case_ = $1$OneofCase.None;",
+                    oneof_name(), oneof_property_name());
+  writer->WriteLine("  }");
+  writer->WriteLine("  return this;");
+  writer->WriteLine("}");
+}
+
+void PrimitiveOneofFieldGenerator::WriteEquals(Writer* writer) {
+  writer->WriteLine("if (!$0$.Equals(other.$0$)) return false;", property_name());
+}
+void PrimitiveOneofFieldGenerator::WriteToString(Writer* writer) {
+  writer->WriteLine("PrintField(\"$0$\", $1$, $2$_, writer);",
+                    descriptor_->name(), has_property_check, oneof_name());
+}
+
+void PrimitiveOneofFieldGenerator::GenerateParsingCode(Writer* writer) {
+  writer->WriteLine("$0$ value = $1$;", type_name(), default_value());
+  writer->WriteLine("if (input.Read$0$(ref value)) {",
+		    capitalized_type_name());
+  writer->WriteLine("  result.$0$_ = value;", oneof_name());
+  writer->WriteLine("  result.$0$Case_ = $1$OneofCase.$2$;",
+		    oneof_name(), oneof_property_name(), property_name());
+  writer->WriteLine("}");
 }
 
 }  // namespace csharp
diff --git a/src/google/protobuf/compiler/csharp/csharp_primitive_field.h b/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
index fb27ab43..ecc6ed91 100644
--- a/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
+++ b/src/google/protobuf/compiler/csharp/csharp_primitive_field.h
@@ -60,10 +60,28 @@ class PrimitiveFieldGenerator : public FieldGeneratorBase {
   virtual void WriteEquals(Writer* writer);
   virtual void WriteToString(Writer* writer);
 
+ protected:
+  string has_property_check;
+
  private:
   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(PrimitiveFieldGenerator);
 };
 
+class PrimitiveOneofFieldGenerator : public PrimitiveFieldGenerator {
+ public:
+  PrimitiveOneofFieldGenerator(const FieldDescriptor* descriptor, int fieldOrdinal);
+  ~PrimitiveOneofFieldGenerator();
+
+  virtual void GenerateMembers(Writer* writer);
+  virtual void GenerateBuilderMembers(Writer* writer);
+  virtual void WriteEquals(Writer* writer);
+  virtual void WriteToString(Writer* writer);
+  virtual void GenerateParsingCode(Writer* writer);
+
+ private:
+  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(PrimitiveOneofFieldGenerator);
+};
+
 }  // namespace csharp
 }  // namespace compiler
 }  // namespace protobuf