Merge pull request #785 from jskeet/csharp-directories

Generate C# directory hierarchy with new option

26 files changed, 1095 insertions, 762 deletions

diff --git a/csharp/generate_protos.sh b/csharp/generate_protos.sh
index 0d217a9d..3a556b0e 100755
--- a/csharp/generate_protos.sh
+++ b/csharp/generate_protos.sh
@@ -35,11 +35,10 @@ if [ -z "$PROTOC" ]; then
   fi
 fi
 
-# Descriptor proto
-$PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf/Reflection \
-    src/google/protobuf/descriptor.proto
-
-$PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf/WellKnownTypes \
+# descriptor.proto and well-known types
+$PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf \
+    --csharp_opt=base_namespace=Google.Protobuf \
+    src/google/protobuf/descriptor.proto \
     src/google/protobuf/any.proto \
     src/google/protobuf/api.proto \
     src/google/protobuf/duration.proto \
@@ -51,15 +50,18 @@ $PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf/WellKnownTypes \
     src/google/protobuf/type.proto \
     src/google/protobuf/wrappers.proto
 
-$PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf.Test/TestProtos \
+# Test protos where the namespace matches the target location
+$PROTOC -Isrc --csharp_out=csharp/src/Google.Protobuf.Test \
+    --csharp_opt=base_namespace=Google.Protobuf \
     src/google/protobuf/map_unittest_proto3.proto \
     src/google/protobuf/unittest_proto3.proto \
     src/google/protobuf/unittest_import_proto3.proto \
     src/google/protobuf/unittest_import_public_proto3.proto \
     src/google/protobuf/unittest_well_known_types.proto
 
-
-$PROTOC -Icsharp/protos --csharp_out=csharp/src/Google.Protobuf.Test/TestProtos \
+# Different base namespace to the protos above
+$PROTOC -Icsharp/protos --csharp_out=csharp/src/Google.Protobuf.Test \
+    --csharp_opt=base_namespace=UnitTest.Issues \
     csharp/protos/unittest_issues.proto
 
 # AddressBook sample protos
diff --git a/csharp/src/AddressBook/Addressbook.cs b/csharp/src/AddressBook/Addressbook.cs
index f2be5bae..017a3f84 100644
--- a/csharp/src/AddressBook/Addressbook.cs
+++ b/csharp/src/AddressBook/Addressbook.cs
@@ -21,14 +21,14 @@ namespace Google.Protobuf.Examples.AddressBook {
     static Addressbook() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "ChFhZGRyZXNzYm9vay5wcm90bxIIdHV0b3JpYWwi1QEKBlBlcnNvbhIMCgRu", 
-            "YW1lGAEgASgJEgoKAmlkGAIgASgFEg0KBWVtYWlsGAMgASgJEiwKBnBob25l", 
-            "cxgEIAMoCzIcLnR1dG9yaWFsLlBlcnNvbi5QaG9uZU51bWJlchpHCgtQaG9u", 
-            "ZU51bWJlchIOCgZudW1iZXIYASABKAkSKAoEdHlwZRgCIAEoDjIaLnR1dG9y", 
-            "aWFsLlBlcnNvbi5QaG9uZVR5cGUiKwoJUGhvbmVUeXBlEgoKBk1PQklMRRAA", 
-            "EggKBEhPTUUQARIICgRXT1JLEAIiLwoLQWRkcmVzc0Jvb2sSIAoGcGVvcGxl", 
-            "GAEgAygLMhAudHV0b3JpYWwuUGVyc29uQlAKFGNvbS5leGFtcGxlLnR1dG9y", 
-            "aWFsQhFBZGRyZXNzQm9va1Byb3Rvc6oCJEdvb2dsZS5Qcm90b2J1Zi5FeGFt", 
+            "ChFhZGRyZXNzYm9vay5wcm90bxIIdHV0b3JpYWwi1QEKBlBlcnNvbhIMCgRu",
+            "YW1lGAEgASgJEgoKAmlkGAIgASgFEg0KBWVtYWlsGAMgASgJEiwKBnBob25l",
+            "cxgEIAMoCzIcLnR1dG9yaWFsLlBlcnNvbi5QaG9uZU51bWJlchpHCgtQaG9u",
+            "ZU51bWJlchIOCgZudW1iZXIYASABKAkSKAoEdHlwZRgCIAEoDjIaLnR1dG9y",
+            "aWFsLlBlcnNvbi5QaG9uZVR5cGUiKwoJUGhvbmVUeXBlEgoKBk1PQklMRRAA",
+            "EggKBEhPTUUQARIICgRXT1JLEAIiLwoLQWRkcmVzc0Jvb2sSIAoGcGVvcGxl",
+            "GAEgAygLMhAudHV0b3JpYWwuUGVyc29uQlAKFGNvbS5leGFtcGxlLnR1dG9y",
+            "aWFsQhFBZGRyZXNzQm9va1Byb3Rvc6oCJEdvb2dsZS5Qcm90b2J1Zi5FeGFt",
             "cGxlcy5BZGRyZXNzQm9va2IGcHJvdG8z"));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { },
diff --git a/csharp/src/Google.Protobuf.Conformance/Conformance.cs b/csharp/src/Google.Protobuf.Conformance/Conformance.cs
index e905d4e4..41492f21 100644
--- a/csharp/src/Google.Protobuf.Conformance/Conformance.cs
+++ b/csharp/src/Google.Protobuf.Conformance/Conformance.cs
@@ -21,116 +21,116 @@ namespace Conformance {
     static Conformance() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "ChFjb25mb3JtYW5jZS5wcm90bxILY29uZm9ybWFuY2UijQEKEkNvbmZvcm1h", 
-            "bmNlUmVxdWVzdBIaChBwcm90b2J1Zl9wYXlsb2FkGAEgASgMSAASFgoManNv", 
-            "bl9wYXlsb2FkGAIgASgJSAASOAoXcmVxdWVzdGVkX291dHB1dF9mb3JtYXQY", 
-            "AyABKA4yFy5jb25mb3JtYW5jZS5XaXJlRm9ybWF0QgkKB3BheWxvYWQilgEK", 
-            "E0NvbmZvcm1hbmNlUmVzcG9uc2USFQoLcGFyc2VfZXJyb3IYASABKAlIABIX", 
-            "Cg1ydW50aW1lX2Vycm9yGAIgASgJSAASGgoQcHJvdG9idWZfcGF5bG9hZBgD", 
-            "IAEoDEgAEhYKDGpzb25fcGF5bG9hZBgEIAEoCUgAEhEKB3NraXBwZWQYBSAB", 
-            "KAlIAEIICgZyZXN1bHQi6yIKDFRlc3RBbGxUeXBlcxIWCg5vcHRpb25hbF9p", 
-            "bnQzMhgBIAEoBRIWCg5vcHRpb25hbF9pbnQ2NBgCIAEoAxIXCg9vcHRpb25h", 
-            "bF91aW50MzIYAyABKA0SFwoPb3B0aW9uYWxfdWludDY0GAQgASgEEhcKD29w", 
-            "dGlvbmFsX3NpbnQzMhgFIAEoERIXCg9vcHRpb25hbF9zaW50NjQYBiABKBIS", 
-            "GAoQb3B0aW9uYWxfZml4ZWQzMhgHIAEoBxIYChBvcHRpb25hbF9maXhlZDY0", 
-            "GAggASgGEhkKEW9wdGlvbmFsX3NmaXhlZDMyGAkgASgPEhkKEW9wdGlvbmFs", 
-            "X3NmaXhlZDY0GAogASgQEhYKDm9wdGlvbmFsX2Zsb2F0GAsgASgCEhcKD29w", 
-            "dGlvbmFsX2RvdWJsZRgMIAEoARIVCg1vcHRpb25hbF9ib29sGA0gASgIEhcK", 
-            "D29wdGlvbmFsX3N0cmluZxgOIAEoCRIWCg5vcHRpb25hbF9ieXRlcxgPIAEo", 
-            "DBJIChdvcHRpb25hbF9uZXN0ZWRfbWVzc2FnZRgSIAEoCzInLmNvbmZvcm1h", 
-            "bmNlLlRlc3RBbGxUeXBlcy5OZXN0ZWRNZXNzYWdlEj0KGG9wdGlvbmFsX2Zv", 
-            "cmVpZ25fbWVzc2FnZRgTIAEoCzIbLmNvbmZvcm1hbmNlLkZvcmVpZ25NZXNz", 
-            "YWdlEkIKFG9wdGlvbmFsX25lc3RlZF9lbnVtGBUgASgOMiQuY29uZm9ybWFu", 
-            "Y2UuVGVzdEFsbFR5cGVzLk5lc3RlZEVudW0SNwoVb3B0aW9uYWxfZm9yZWln", 
-            "bl9lbnVtGBYgASgOMhguY29uZm9ybWFuY2UuRm9yZWlnbkVudW0SIQoVb3B0", 
-            "aW9uYWxfc3RyaW5nX3BpZWNlGBggASgJQgIIAhIZCg1vcHRpb25hbF9jb3Jk", 
-            "GBkgASgJQgIIARI0ChFyZWN1cnNpdmVfbWVzc2FnZRgbIAEoCzIZLmNvbmZv", 
-            "cm1hbmNlLlRlc3RBbGxUeXBlcxIWCg5yZXBlYXRlZF9pbnQzMhgfIAMoBRIW", 
-            "Cg5yZXBlYXRlZF9pbnQ2NBggIAMoAxIXCg9yZXBlYXRlZF91aW50MzIYISAD", 
-            "KA0SFwoPcmVwZWF0ZWRfdWludDY0GCIgAygEEhcKD3JlcGVhdGVkX3NpbnQz", 
-            "MhgjIAMoERIXCg9yZXBlYXRlZF9zaW50NjQYJCADKBISGAoQcmVwZWF0ZWRf", 
-            "Zml4ZWQzMhglIAMoBxIYChByZXBlYXRlZF9maXhlZDY0GCYgAygGEhkKEXJl", 
-            "cGVhdGVkX3NmaXhlZDMyGCcgAygPEhkKEXJlcGVhdGVkX3NmaXhlZDY0GCgg", 
-            "AygQEhYKDnJlcGVhdGVkX2Zsb2F0GCkgAygCEhcKD3JlcGVhdGVkX2RvdWJs", 
-            "ZRgqIAMoARIVCg1yZXBlYXRlZF9ib29sGCsgAygIEhcKD3JlcGVhdGVkX3N0", 
-            "cmluZxgsIAMoCRIWCg5yZXBlYXRlZF9ieXRlcxgtIAMoDBJIChdyZXBlYXRl", 
-            "ZF9uZXN0ZWRfbWVzc2FnZRgwIAMoCzInLmNvbmZvcm1hbmNlLlRlc3RBbGxU", 
-            "eXBlcy5OZXN0ZWRNZXNzYWdlEj0KGHJlcGVhdGVkX2ZvcmVpZ25fbWVzc2Fn", 
-            "ZRgxIAMoCzIbLmNvbmZvcm1hbmNlLkZvcmVpZ25NZXNzYWdlEkIKFHJlcGVh", 
-            "dGVkX25lc3RlZF9lbnVtGDMgAygOMiQuY29uZm9ybWFuY2UuVGVzdEFsbFR5", 
-            "cGVzLk5lc3RlZEVudW0SNwoVcmVwZWF0ZWRfZm9yZWlnbl9lbnVtGDQgAygO", 
-            "MhguY29uZm9ybWFuY2UuRm9yZWlnbkVudW0SIQoVcmVwZWF0ZWRfc3RyaW5n", 
-            "X3BpZWNlGDYgAygJQgIIAhIZCg1yZXBlYXRlZF9jb3JkGDcgAygJQgIIARJF", 
-            "Cg9tYXBfaW50MzJfaW50MzIYOCADKAsyLC5jb25mb3JtYW5jZS5UZXN0QWxs", 
-            "VHlwZXMuTWFwSW50MzJJbnQzMkVudHJ5EkUKD21hcF9pbnQ2NF9pbnQ2NBg5", 
-            "IAMoCzIsLmNvbmZvcm1hbmNlLlRlc3RBbGxUeXBlcy5NYXBJbnQ2NEludDY0", 
-            "RW50cnkSSQoRbWFwX3VpbnQzMl91aW50MzIYOiADKAsyLi5jb25mb3JtYW5j", 
-            "ZS5UZXN0QWxsVHlwZXMuTWFwVWludDMyVWludDMyRW50cnkSSQoRbWFwX3Vp", 
-            "bnQ2NF91aW50NjQYOyADKAsyLi5jb25mb3JtYW5jZS5UZXN0QWxsVHlwZXMu", 
-            "TWFwVWludDY0VWludDY0RW50cnkSSQoRbWFwX3NpbnQzMl9zaW50MzIYPCAD", 
-            "KAsyLi5jb25mb3JtYW5jZS5UZXN0QWxsVHlwZXMuTWFwU2ludDMyU2ludDMy", 
-            "RW50cnkSSQoRbWFwX3NpbnQ2NF9zaW50NjQYPSADKAsyLi5jb25mb3JtYW5j", 
-            "ZS5UZXN0QWxsVHlwZXMuTWFwU2ludDY0U2ludDY0RW50cnkSTQoTbWFwX2Zp", 
-            "eGVkMzJfZml4ZWQzMhg+IAMoCzIwLmNvbmZvcm1hbmNlLlRlc3RBbGxUeXBl", 
-            "cy5NYXBGaXhlZDMyRml4ZWQzMkVudHJ5Ek0KE21hcF9maXhlZDY0X2ZpeGVk", 
-            "NjQYPyADKAsyMC5jb25mb3JtYW5jZS5UZXN0QWxsVHlwZXMuTWFwRml4ZWQ2", 
-            "NEZpeGVkNjRFbnRyeRJRChVtYXBfc2ZpeGVkMzJfc2ZpeGVkMzIYQCADKAsy", 
-            "Mi5jb25mb3JtYW5jZS5UZXN0QWxsVHlwZXMuTWFwU2ZpeGVkMzJTZml4ZWQz", 
-            "MkVudHJ5ElEKFW1hcF9zZml4ZWQ2NF9zZml4ZWQ2NBhBIAMoCzIyLmNvbmZv", 
-            "cm1hbmNlLlRlc3RBbGxUeXBlcy5NYXBTZml4ZWQ2NFNmaXhlZDY0RW50cnkS", 
-            "RQoPbWFwX2ludDMyX2Zsb2F0GEIgAygLMiwuY29uZm9ybWFuY2UuVGVzdEFs", 
-            "bFR5cGVzLk1hcEludDMyRmxvYXRFbnRyeRJHChBtYXBfaW50MzJfZG91Ymxl", 
-            "GEMgAygLMi0uY29uZm9ybWFuY2UuVGVzdEFsbFR5cGVzLk1hcEludDMyRG91", 
-            "YmxlRW50cnkSQQoNbWFwX2Jvb2xfYm9vbBhEIAMoCzIqLmNvbmZvcm1hbmNl", 
-            "LlRlc3RBbGxUeXBlcy5NYXBCb29sQm9vbEVudHJ5EkkKEW1hcF9zdHJpbmdf", 
-            "c3RyaW5nGEUgAygLMi4uY29uZm9ybWFuY2UuVGVzdEFsbFR5cGVzLk1hcFN0", 
-            "cmluZ1N0cmluZ0VudHJ5EkcKEG1hcF9zdHJpbmdfYnl0ZXMYRiADKAsyLS5j", 
-            "b25mb3JtYW5jZS5UZXN0QWxsVHlwZXMuTWFwU3RyaW5nQnl0ZXNFbnRyeRJY", 
-            "ChltYXBfc3RyaW5nX25lc3RlZF9tZXNzYWdlGEcgAygLMjUuY29uZm9ybWFu", 
-            "Y2UuVGVzdEFsbFR5cGVzLk1hcFN0cmluZ05lc3RlZE1lc3NhZ2VFbnRyeRJa", 
-            "ChptYXBfc3RyaW5nX2ZvcmVpZ25fbWVzc2FnZRhIIAMoCzI2LmNvbmZvcm1h", 
-            "bmNlLlRlc3RBbGxUeXBlcy5NYXBTdHJpbmdGb3JlaWduTWVzc2FnZUVudHJ5", 
-            "ElIKFm1hcF9zdHJpbmdfbmVzdGVkX2VudW0YSSADKAsyMi5jb25mb3JtYW5j", 
-            "ZS5UZXN0QWxsVHlwZXMuTWFwU3RyaW5nTmVzdGVkRW51bUVudHJ5ElQKF21h", 
-            "cF9zdHJpbmdfZm9yZWlnbl9lbnVtGEogAygLMjMuY29uZm9ybWFuY2UuVGVz", 
-            "dEFsbFR5cGVzLk1hcFN0cmluZ0ZvcmVpZ25FbnVtRW50cnkSFgoMb25lb2Zf", 
-            "dWludDMyGG8gASgNSAASRwoUb25lb2ZfbmVzdGVkX21lc3NhZ2UYcCABKAsy", 
-            "Jy5jb25mb3JtYW5jZS5UZXN0QWxsVHlwZXMuTmVzdGVkTWVzc2FnZUgAEhYK", 
-            "DG9uZW9mX3N0cmluZxhxIAEoCUgAEhUKC29uZW9mX2J5dGVzGHIgASgMSAAa", 
-            "SgoNTmVzdGVkTWVzc2FnZRIJCgFhGAEgASgFEi4KC2NvcmVjdXJzaXZlGAIg", 
-            "ASgLMhkuY29uZm9ybWFuY2UuVGVzdEFsbFR5cGVzGjQKEk1hcEludDMySW50", 
-            "MzJFbnRyeRILCgNrZXkYASABKAUSDQoFdmFsdWUYAiABKAU6AjgBGjQKEk1h", 
-            "cEludDY0SW50NjRFbnRyeRILCgNrZXkYASABKAMSDQoFdmFsdWUYAiABKAM6", 
-            "AjgBGjYKFE1hcFVpbnQzMlVpbnQzMkVudHJ5EgsKA2tleRgBIAEoDRINCgV2", 
-            "YWx1ZRgCIAEoDToCOAEaNgoUTWFwVWludDY0VWludDY0RW50cnkSCwoDa2V5", 
-            "GAEgASgEEg0KBXZhbHVlGAIgASgEOgI4ARo2ChRNYXBTaW50MzJTaW50MzJF", 
-            "bnRyeRILCgNrZXkYASABKBESDQoFdmFsdWUYAiABKBE6AjgBGjYKFE1hcFNp", 
-            "bnQ2NFNpbnQ2NEVudHJ5EgsKA2tleRgBIAEoEhINCgV2YWx1ZRgCIAEoEjoC", 
-            "OAEaOAoWTWFwRml4ZWQzMkZpeGVkMzJFbnRyeRILCgNrZXkYASABKAcSDQoF", 
-            "dmFsdWUYAiABKAc6AjgBGjgKFk1hcEZpeGVkNjRGaXhlZDY0RW50cnkSCwoD", 
-            "a2V5GAEgASgGEg0KBXZhbHVlGAIgASgGOgI4ARo6ChhNYXBTZml4ZWQzMlNm", 
-            "aXhlZDMyRW50cnkSCwoDa2V5GAEgASgPEg0KBXZhbHVlGAIgASgPOgI4ARo6", 
-            "ChhNYXBTZml4ZWQ2NFNmaXhlZDY0RW50cnkSCwoDa2V5GAEgASgQEg0KBXZh", 
-            "bHVlGAIgASgQOgI4ARo0ChJNYXBJbnQzMkZsb2F0RW50cnkSCwoDa2V5GAEg", 
-            "ASgFEg0KBXZhbHVlGAIgASgCOgI4ARo1ChNNYXBJbnQzMkRvdWJsZUVudHJ5", 
-            "EgsKA2tleRgBIAEoBRINCgV2YWx1ZRgCIAEoAToCOAEaMgoQTWFwQm9vbEJv", 
-            "b2xFbnRyeRILCgNrZXkYASABKAgSDQoFdmFsdWUYAiABKAg6AjgBGjYKFE1h", 
-            "cFN0cmluZ1N0cmluZ0VudHJ5EgsKA2tleRgBIAEoCRINCgV2YWx1ZRgCIAEo", 
-            "CToCOAEaNQoTTWFwU3RyaW5nQnl0ZXNFbnRyeRILCgNrZXkYASABKAkSDQoF", 
-            "dmFsdWUYAiABKAw6AjgBGmYKG01hcFN0cmluZ05lc3RlZE1lc3NhZ2VFbnRy", 
-            "eRILCgNrZXkYASABKAkSNgoFdmFsdWUYAiABKAsyJy5jb25mb3JtYW5jZS5U", 
-            "ZXN0QWxsVHlwZXMuTmVzdGVkTWVzc2FnZToCOAEaWwocTWFwU3RyaW5nRm9y", 
-            "ZWlnbk1lc3NhZ2VFbnRyeRILCgNrZXkYASABKAkSKgoFdmFsdWUYAiABKAsy", 
-            "Gy5jb25mb3JtYW5jZS5Gb3JlaWduTWVzc2FnZToCOAEaYAoYTWFwU3RyaW5n", 
-            "TmVzdGVkRW51bUVudHJ5EgsKA2tleRgBIAEoCRIzCgV2YWx1ZRgCIAEoDjIk", 
-            "LmNvbmZvcm1hbmNlLlRlc3RBbGxUeXBlcy5OZXN0ZWRFbnVtOgI4ARpVChlN", 
-            "YXBTdHJpbmdGb3JlaWduRW51bUVudHJ5EgsKA2tleRgBIAEoCRInCgV2YWx1", 
-            "ZRgCIAEoDjIYLmNvbmZvcm1hbmNlLkZvcmVpZ25FbnVtOgI4ASI5CgpOZXN0", 
-            "ZWRFbnVtEgcKA0ZPTxAAEgcKA0JBUhABEgcKA0JBWhACEhAKA05FRxD/////", 
-            "//////8BQg0KC29uZW9mX2ZpZWxkIhsKDkZvcmVpZ25NZXNzYWdlEgkKAWMY", 
-            "ASABKAUqNQoKV2lyZUZvcm1hdBIPCgtVTlNQRUNJRklFRBAAEgwKCFBST1RP", 
-            "QlVGEAESCAoESlNPThACKkAKC0ZvcmVpZ25FbnVtEg8KC0ZPUkVJR05fRk9P", 
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+            "ChFjb25mb3JtYW5jZS5wcm90bxILY29uZm9ybWFuY2UijQEKEkNvbmZvcm1h",
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+            "KAlIAEIICgZyZXN1bHQi6yIKDFRlc3RBbGxUeXBlcxIWCg5vcHRpb25hbF9p",
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+            "bF91aW50MzIYAyABKA0SFwoPb3B0aW9uYWxfdWludDY0GAQgASgEEhcKD29w",
+            "dGlvbmFsX3NpbnQzMhgFIAEoERIXCg9vcHRpb25hbF9zaW50NjQYBiABKBIS",
+            "GAoQb3B0aW9uYWxfZml4ZWQzMhgHIAEoBxIYChBvcHRpb25hbF9maXhlZDY0",
+            "GAggASgGEhkKEW9wdGlvbmFsX3NmaXhlZDMyGAkgASgPEhkKEW9wdGlvbmFs",
+            "X3NmaXhlZDY0GAogASgQEhYKDm9wdGlvbmFsX2Zsb2F0GAsgASgCEhcKD29w",
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+            "EgsKA2tleRgBIAEoBRINCgV2YWx1ZRgCIAEoAToCOAEaMgoQTWFwQm9vbEJv",
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+            "cFN0cmluZ1N0cmluZ0VudHJ5EgsKA2tleRgBIAEoCRINCgV2YWx1ZRgCIAEo",
+            "CToCOAEaNQoTTWFwU3RyaW5nQnl0ZXNFbnRyeRILCgNrZXkYASABKAkSDQoF",
+            "dmFsdWUYAiABKAw6AjgBGmYKG01hcFN0cmluZ05lc3RlZE1lc3NhZ2VFbnRy",
+            "eRILCgNrZXkYASABKAkSNgoFdmFsdWUYAiABKAsyJy5jb25mb3JtYW5jZS5U",
+            "ZXN0QWxsVHlwZXMuTmVzdGVkTWVzc2FnZToCOAEaWwocTWFwU3RyaW5nRm9y",
+            "ZWlnbk1lc3NhZ2VFbnRyeRILCgNrZXkYASABKAkSKgoFdmFsdWUYAiABKAsy",
+            "Gy5jb25mb3JtYW5jZS5Gb3JlaWduTWVzc2FnZToCOAEaYAoYTWFwU3RyaW5n",
+            "TmVzdGVkRW51bUVudHJ5EgsKA2tleRgBIAEoCRIzCgV2YWx1ZRgCIAEoDjIk",
+            "LmNvbmZvcm1hbmNlLlRlc3RBbGxUeXBlcy5OZXN0ZWRFbnVtOgI4ARpVChlN",
+            "YXBTdHJpbmdGb3JlaWduRW51bUVudHJ5EgsKA2tleRgBIAEoCRInCgV2YWx1",
+            "ZRgCIAEoDjIYLmNvbmZvcm1hbmNlLkZvcmVpZ25FbnVtOgI4ASI5CgpOZXN0",
+            "ZWRFbnVtEgcKA0ZPTxAAEgcKA0JBUhABEgcKA0JBWhACEhAKA05FRxD/////",
+            "//////8BQg0KC29uZW9mX2ZpZWxkIhsKDkZvcmVpZ25NZXNzYWdlEgkKAWMY",
+            "ASABKAUqNQoKV2lyZUZvcm1hdBIPCgtVTlNQRUNJRklFRBAAEgwKCFBST1RP",
+            "QlVGEAESCAoESlNPThACKkAKC0ZvcmVpZ25FbnVtEg8KC0ZPUkVJR05fRk9P",
+            "EAASDwoLRk9SRUlHTl9CQVIQARIPCgtGT1JFSUdOX0JBWhACQiEKH2NvbS5n",
             "b29nbGUucHJvdG9idWYuY29uZm9ybWFuY2ViBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { },
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
index e9e18193..179afda9 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/MapUnittestProto3.cs
@@ -21,129 +21,129 @@ namespace Google.Protobuf.TestProtos {
     static MapUnittestProto3() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
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-            "bnRyeRJKChFtYXBfc2ludDMyX3NpbnQzMhgFIAMoCzIvLnByb3RvYnVmX3Vu", 
-            "aXR0ZXN0LlRlc3RNYXAuTWFwU2ludDMyU2ludDMyRW50cnkSSgoRbWFwX3Np", 
-            "bnQ2NF9zaW50NjQYBiADKAsyLy5wcm90b2J1Zl91bml0dGVzdC5UZXN0TWFw", 
-            "Lk1hcFNpbnQ2NFNpbnQ2NEVudHJ5Ek4KE21hcF9maXhlZDMyX2ZpeGVkMzIY", 
-            "ByADKAsyMS5wcm90b2J1Zl91bml0dGVzdC5UZXN0TWFwLk1hcEZpeGVkMzJG", 
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-            "cEludDMyRmxvYXRFbnRyeRJIChBtYXBfaW50MzJfZG91YmxlGAwgAygLMi4u", 
-            "cHJvdG9idWZfdW5pdHRlc3QuVGVzdE1hcC5NYXBJbnQzMkRvdWJsZUVudHJ5", 
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-            "ZXN0TWFwLk1hcEJvb2xCb29sRW50cnkSSgoRbWFwX3N0cmluZ19zdHJpbmcY", 
-            "DiADKAsyLy5wcm90b2J1Zl91bml0dGVzdC5UZXN0TWFwLk1hcFN0cmluZ1N0", 
-            "cmluZ0VudHJ5EkYKD21hcF9pbnQzMl9ieXRlcxgPIAMoCzItLnByb3RvYnVm", 
-            "X3VuaXR0ZXN0LlRlc3RNYXAuTWFwSW50MzJCeXRlc0VudHJ5EkQKDm1hcF9p", 
-            "bnQzMl9lbnVtGBAgAygLMiwucHJvdG9idWZfdW5pdHRlc3QuVGVzdE1hcC5N", 
-            "YXBJbnQzMkVudW1FbnRyeRJZChltYXBfaW50MzJfZm9yZWlnbl9tZXNzYWdl", 
-            "GBEgAygLMjYucHJvdG9idWZfdW5pdHRlc3QuVGVzdE1hcC5NYXBJbnQzMkZv", 
-            "cmVpZ25NZXNzYWdlRW50cnkaNAoSTWFwSW50MzJJbnQzMkVudHJ5EgsKA2tl", 
-            "eRgBIAEoBRINCgV2YWx1ZRgCIAEoBToCOAEaNAoSTWFwSW50NjRJbnQ2NEVu", 
-            "dHJ5EgsKA2tleRgBIAEoAxINCgV2YWx1ZRgCIAEoAzoCOAEaNgoUTWFwVWlu", 
-            "dDMyVWludDMyRW50cnkSCwoDa2V5GAEgASgNEg0KBXZhbHVlGAIgASgNOgI4", 
-            "ARo2ChRNYXBVaW50NjRVaW50NjRFbnRyeRILCgNrZXkYASABKAQSDQoFdmFs", 
-            "dWUYAiABKAQ6AjgBGjYKFE1hcFNpbnQzMlNpbnQzMkVudHJ5EgsKA2tleRgB", 
-            "IAEoERINCgV2YWx1ZRgCIAEoEToCOAEaNgoUTWFwU2ludDY0U2ludDY0RW50", 
-            "cnkSCwoDa2V5GAEgASgSEg0KBXZhbHVlGAIgASgSOgI4ARo4ChZNYXBGaXhl", 
-            "ZDMyRml4ZWQzMkVudHJ5EgsKA2tleRgBIAEoBxINCgV2YWx1ZRgCIAEoBzoC", 
-            "OAEaOAoWTWFwRml4ZWQ2NEZpeGVkNjRFbnRyeRILCgNrZXkYASABKAYSDQoF", 
-            "dmFsdWUYAiABKAY6AjgBGjoKGE1hcFNmaXhlZDMyU2ZpeGVkMzJFbnRyeRIL", 
-            "CgNrZXkYASABKA8SDQoFdmFsdWUYAiABKA86AjgBGjoKGE1hcFNmaXhlZDY0", 
-            "U2ZpeGVkNjRFbnRyeRILCgNrZXkYASABKBASDQoFdmFsdWUYAiABKBA6AjgB", 
-            "GjQKEk1hcEludDMyRmxvYXRFbnRyeRILCgNrZXkYASABKAUSDQoFdmFsdWUY", 
-            "AiABKAI6AjgBGjUKE01hcEludDMyRG91YmxlRW50cnkSCwoDa2V5GAEgASgF", 
-            "Eg0KBXZhbHVlGAIgASgBOgI4ARoyChBNYXBCb29sQm9vbEVudHJ5EgsKA2tl", 
-            "eRgBIAEoCBINCgV2YWx1ZRgCIAEoCDoCOAEaNgoUTWFwU3RyaW5nU3RyaW5n", 
-            "RW50cnkSCwoDa2V5GAEgASgJEg0KBXZhbHVlGAIgASgJOgI4ARo0ChJNYXBJ", 
-            "bnQzMkJ5dGVzRW50cnkSCwoDa2V5GAEgASgFEg0KBXZhbHVlGAIgASgMOgI4", 
-            "ARpPChFNYXBJbnQzMkVudW1FbnRyeRILCgNrZXkYASABKAUSKQoFdmFsdWUY", 
-            "AiABKA4yGi5wcm90b2J1Zl91bml0dGVzdC5NYXBFbnVtOgI4ARpgChtNYXBJ", 
-            "bnQzMkZvcmVpZ25NZXNzYWdlRW50cnkSCwoDa2V5GAEgASgFEjAKBXZhbHVl", 
-            "GAIgASgLMiEucHJvdG9idWZfdW5pdHRlc3QuRm9yZWlnbk1lc3NhZ2U6AjgB", 
-            "IkEKEVRlc3RNYXBTdWJtZXNzYWdlEiwKCHRlc3RfbWFwGAEgASgLMhoucHJv", 
-            "dG9idWZfdW5pdHRlc3QuVGVzdE1hcCK8AQoOVGVzdE1lc3NhZ2VNYXASUQoR", 
-            "bWFwX2ludDMyX21lc3NhZ2UYASADKAsyNi5wcm90b2J1Zl91bml0dGVzdC5U", 
-            "ZXN0TWVzc2FnZU1hcC5NYXBJbnQzMk1lc3NhZ2VFbnRyeRpXChRNYXBJbnQz", 
-            "Mk1lc3NhZ2VFbnRyeRILCgNrZXkYASABKAUSLgoFdmFsdWUYAiABKAsyHy5w", 
-            "cm90b2J1Zl91bml0dGVzdC5UZXN0QWxsVHlwZXM6AjgBIuMBCg9UZXN0U2Ft", 
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+            "Rml4ZWQzMkZpeGVkMzJFbnRyeRILCgNrZXkYASABKAcSDQoFdmFsdWUYAiAB",
+            "KAc6AjgBGjgKFk1hcEZpeGVkNjRGaXhlZDY0RW50cnkSCwoDa2V5GAEgASgG",
+            "Eg0KBXZhbHVlGAIgASgGOgI4ARo6ChhNYXBTZml4ZWQzMlNmaXhlZDMyRW50",
+            "cnkSCwoDa2V5GAEgASgPEg0KBXZhbHVlGAIgASgPOgI4ARo6ChhNYXBTZml4",
+            "ZWQ2NFNmaXhlZDY0RW50cnkSCwoDa2V5GAEgASgQEg0KBXZhbHVlGAIgASgQ",
+            "OgI4ARo0ChJNYXBJbnQzMkZsb2F0RW50cnkSCwoDa2V5GAEgASgFEg0KBXZh",
+            "bHVlGAIgASgCOgI4ARo1ChNNYXBJbnQzMkRvdWJsZUVudHJ5EgsKA2tleRgB",
+            "IAEoBRINCgV2YWx1ZRgCIAEoAToCOAEaMgoQTWFwQm9vbEJvb2xFbnRyeRIL",
+            "CgNrZXkYASABKAgSDQoFdmFsdWUYAiABKAg6AjgBGk8KEU1hcEludDMyRW51",
+            "bUVudHJ5EgsKA2tleRgBIAEoBRIpCgV2YWx1ZRgCIAEoDjIaLnByb3RvYnVm",
+            "X3VuaXR0ZXN0Lk1hcEVudW06AjgBGmAKG01hcEludDMyRm9yZWlnbk1lc3Nh",
+            "Z2VFbnRyeRILCgNrZXkYASABKAUSMAoFdmFsdWUYAiABKAsyIS5wcm90b2J1",
+            "Zl91bml0dGVzdC5Gb3JlaWduTWVzc2FnZToCOAEi5AEKH01lc3NhZ2VDb250",
+            "YWluaW5nRW51bUNhbGxlZFR5cGUSSgoEdHlwZRgBIAMoCzI8LnByb3RvYnVm",
+            "X3VuaXR0ZXN0Lk1lc3NhZ2VDb250YWluaW5nRW51bUNhbGxlZFR5cGUuVHlw",
+            "ZUVudHJ5Gl8KCVR5cGVFbnRyeRILCgNrZXkYASABKAUSQQoFdmFsdWUYAiAB",
+            "KAsyMi5wcm90b2J1Zl91bml0dGVzdC5NZXNzYWdlQ29udGFpbmluZ0VudW1D",
+            "YWxsZWRUeXBlOgI4ASIUCgRUeXBlEgwKCFRZUEVfRk9PEAAinQEKH01lc3Nh",
+            "Z2VDb250YWluaW5nTWFwQ2FsbGVkRW50cnkSTAoFZW50cnkYASADKAsyPS5w",
+            "cm90b2J1Zl91bml0dGVzdC5NZXNzYWdlQ29udGFpbmluZ01hcENhbGxlZEVu",
+            "dHJ5LkVudHJ5RW50cnkaLAoKRW50cnlFbnRyeRILCgNrZXkYASABKAUSDQoF",
+            "dmFsdWUYAiABKAU6AjgBKj8KB01hcEVudW0SEAoMTUFQX0VOVU1fRk9PEAAS",
+            "EAoMTUFQX0VOVU1fQkFSEAESEAoMTUFQX0VOVU1fQkFaEAJCIPgBAaoCGkdv",
             "b2dsZS5Qcm90b2J1Zi5UZXN0UHJvdG9zYgZwcm90bzM="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.TestProtos.UnittestProto3.Descriptor, },
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
index bf527ac5..b2a97ce5 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportProto3.cs
@@ -21,13 +21,13 @@ namespace Google.Protobuf.TestProtos {
     static UnittestImportProto3() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "Cixnb29nbGUvcHJvdG9idWYvdW5pdHRlc3RfaW1wb3J0X3Byb3RvMy5wcm90", 
-            "bxIYcHJvdG9idWZfdW5pdHRlc3RfaW1wb3J0GjNnb29nbGUvcHJvdG9idWYv", 
-            "dW5pdHRlc3RfaW1wb3J0X3B1YmxpY19wcm90bzMucHJvdG8iGgoNSW1wb3J0", 
-            "TWVzc2FnZRIJCgFkGAEgASgFKlkKCkltcG9ydEVudW0SGwoXSU1QT1JUX0VO", 
-            "VU1fVU5TUEVDSUZJRUQQABIOCgpJTVBPUlRfRk9PEAcSDgoKSU1QT1JUX0JB", 
-            "UhAIEg4KCklNUE9SVF9CQVoQCUI8Chhjb20uZ29vZ2xlLnByb3RvYnVmLnRl", 
-            "c3RIAfgBAaoCGkdvb2dsZS5Qcm90b2J1Zi5UZXN0UHJvdG9zUABiBnByb3Rv", 
+            "Cixnb29nbGUvcHJvdG9idWYvdW5pdHRlc3RfaW1wb3J0X3Byb3RvMy5wcm90",
+            "bxIYcHJvdG9idWZfdW5pdHRlc3RfaW1wb3J0GjNnb29nbGUvcHJvdG9idWYv",
+            "dW5pdHRlc3RfaW1wb3J0X3B1YmxpY19wcm90bzMucHJvdG8iGgoNSW1wb3J0",
+            "TWVzc2FnZRIJCgFkGAEgASgFKlkKCkltcG9ydEVudW0SGwoXSU1QT1JUX0VO",
+            "VU1fVU5TUEVDSUZJRUQQABIOCgpJTVBPUlRfRk9PEAcSDgoKSU1QT1JUX0JB",
+            "UhAIEg4KCklNUE9SVF9CQVoQCUI8Chhjb20uZ29vZ2xlLnByb3RvYnVmLnRl",
+            "c3RIAfgBAaoCGkdvb2dsZS5Qcm90b2J1Zi5UZXN0UHJvdG9zUABiBnByb3Rv",
             "Mw=="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.TestProtos.UnittestImportPublicProto3.Descriptor, },
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
index ec460906..ca3cab26 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestImportPublicProto3.cs
@@ -21,9 +21,9 @@ namespace Google.Protobuf.TestProtos {
     static UnittestImportPublicProto3() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "CjNnb29nbGUvcHJvdG9idWYvdW5pdHRlc3RfaW1wb3J0X3B1YmxpY19wcm90", 
-            "bzMucHJvdG8SGHByb3RvYnVmX3VuaXR0ZXN0X2ltcG9ydCIgChNQdWJsaWNJ", 
-            "bXBvcnRNZXNzYWdlEgkKAWUYASABKAVCNwoYY29tLmdvb2dsZS5wcm90b2J1", 
+            "CjNnb29nbGUvcHJvdG9idWYvdW5pdHRlc3RfaW1wb3J0X3B1YmxpY19wcm90",
+            "bzMucHJvdG8SGHByb3RvYnVmX3VuaXR0ZXN0X2ltcG9ydCIgChNQdWJsaWNJ",
+            "bXBvcnRNZXNzYWdlEgkKAWUYASABKAVCNwoYY29tLmdvb2dsZS5wcm90b2J1",
             "Zi50ZXN0qgIaR29vZ2xlLlByb3RvYnVmLlRlc3RQcm90b3NiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { },
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
index 63119a34..80eb67b0 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestIssues.cs
@@ -21,28 +21,28 @@ namespace UnitTest.Issues.TestProtos {
     static UnittestIssues() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "ChV1bml0dGVzdF9pc3N1ZXMucHJvdG8SD3VuaXR0ZXN0X2lzc3VlcyInCghJ", 
-            "c3N1ZTMwNxobCgpOZXN0ZWRPbmNlGg0KC05lc3RlZFR3aWNlIrABChNOZWdh", 
-            "dGl2ZUVudW1NZXNzYWdlEiwKBXZhbHVlGAEgASgOMh0udW5pdHRlc3RfaXNz", 
-            "dWVzLk5lZ2F0aXZlRW51bRIxCgZ2YWx1ZXMYAiADKA4yHS51bml0dGVzdF9p", 
-            "c3N1ZXMuTmVnYXRpdmVFbnVtQgIQABI4Cg1wYWNrZWRfdmFsdWVzGAMgAygO", 
-            "Mh0udW5pdHRlc3RfaXNzdWVzLk5lZ2F0aXZlRW51bUICEAEiEQoPRGVwcmVj", 
-            "YXRlZENoaWxkIrkCChdEZXByZWNhdGVkRmllbGRzTWVzc2FnZRIaCg5Qcmlt", 
-            "aXRpdmVWYWx1ZRgBIAEoBUICGAESGgoOUHJpbWl0aXZlQXJyYXkYAiADKAVC", 
-            "AhgBEjoKDE1lc3NhZ2VWYWx1ZRgDIAEoCzIgLnVuaXR0ZXN0X2lzc3Vlcy5E", 
-            "ZXByZWNhdGVkQ2hpbGRCAhgBEjoKDE1lc3NhZ2VBcnJheRgEIAMoCzIgLnVu", 
-            "aXR0ZXN0X2lzc3Vlcy5EZXByZWNhdGVkQ2hpbGRCAhgBEjYKCUVudW1WYWx1", 
-            "ZRgFIAEoDjIfLnVuaXR0ZXN0X2lzc3Vlcy5EZXByZWNhdGVkRW51bUICGAES", 
-            "NgoJRW51bUFycmF5GAYgAygOMh8udW5pdHRlc3RfaXNzdWVzLkRlcHJlY2F0", 
-            "ZWRFbnVtQgIYASIZCglJdGVtRmllbGQSDAoEaXRlbRgBIAEoBSJECg1SZXNl", 
-            "cnZlZE5hbWVzEg0KBXR5cGVzGAEgASgFEhIKCmRlc2NyaXB0b3IYAiABKAUa", 
-            "EAoOU29tZU5lc3RlZFR5cGUioAEKFVRlc3RKc29uRmllbGRPcmRlcmluZxIT", 
-            "CgtwbGFpbl9pbnQzMhgEIAEoBRITCglvMV9zdHJpbmcYAiABKAlIABISCghv", 
-            "MV9pbnQzMhgFIAEoBUgAEhQKDHBsYWluX3N0cmluZxgBIAEoCRISCghvMl9p", 
-            "bnQzMhgGIAEoBUgBEhMKCW8yX3N0cmluZxgDIAEoCUgBQgQKAm8xQgQKAm8y", 
-            "KlUKDE5lZ2F0aXZlRW51bRIWChJORUdBVElWRV9FTlVNX1pFUk8QABIWCglG", 
-            "aXZlQmVsb3cQ+///////////ARIVCghNaW51c09uZRD///////////8BKi4K", 
-            "DkRlcHJlY2F0ZWRFbnVtEhMKD0RFUFJFQ0FURURfWkVSTxAAEgcKA29uZRAB", 
+            "ChV1bml0dGVzdF9pc3N1ZXMucHJvdG8SD3VuaXR0ZXN0X2lzc3VlcyInCghJ",
+            "c3N1ZTMwNxobCgpOZXN0ZWRPbmNlGg0KC05lc3RlZFR3aWNlIrABChNOZWdh",
+            "dGl2ZUVudW1NZXNzYWdlEiwKBXZhbHVlGAEgASgOMh0udW5pdHRlc3RfaXNz",
+            "dWVzLk5lZ2F0aXZlRW51bRIxCgZ2YWx1ZXMYAiADKA4yHS51bml0dGVzdF9p",
+            "c3N1ZXMuTmVnYXRpdmVFbnVtQgIQABI4Cg1wYWNrZWRfdmFsdWVzGAMgAygO",
+            "Mh0udW5pdHRlc3RfaXNzdWVzLk5lZ2F0aXZlRW51bUICEAEiEQoPRGVwcmVj",
+            "YXRlZENoaWxkIrkCChdEZXByZWNhdGVkRmllbGRzTWVzc2FnZRIaCg5Qcmlt",
+            "aXRpdmVWYWx1ZRgBIAEoBUICGAESGgoOUHJpbWl0aXZlQXJyYXkYAiADKAVC",
+            "AhgBEjoKDE1lc3NhZ2VWYWx1ZRgDIAEoCzIgLnVuaXR0ZXN0X2lzc3Vlcy5E",
+            "ZXByZWNhdGVkQ2hpbGRCAhgBEjoKDE1lc3NhZ2VBcnJheRgEIAMoCzIgLnVu",
+            "aXR0ZXN0X2lzc3Vlcy5EZXByZWNhdGVkQ2hpbGRCAhgBEjYKCUVudW1WYWx1",
+            "ZRgFIAEoDjIfLnVuaXR0ZXN0X2lzc3Vlcy5EZXByZWNhdGVkRW51bUICGAES",
+            "NgoJRW51bUFycmF5GAYgAygOMh8udW5pdHRlc3RfaXNzdWVzLkRlcHJlY2F0",
+            "ZWRFbnVtQgIYASIZCglJdGVtRmllbGQSDAoEaXRlbRgBIAEoBSJECg1SZXNl",
+            "cnZlZE5hbWVzEg0KBXR5cGVzGAEgASgFEhIKCmRlc2NyaXB0b3IYAiABKAUa",
+            "EAoOU29tZU5lc3RlZFR5cGUioAEKFVRlc3RKc29uRmllbGRPcmRlcmluZxIT",
+            "CgtwbGFpbl9pbnQzMhgEIAEoBRITCglvMV9zdHJpbmcYAiABKAlIABISCghv",
+            "MV9pbnQzMhgFIAEoBUgAEhQKDHBsYWluX3N0cmluZxgBIAEoCRISCghvMl9p",
+            "bnQzMhgGIAEoBUgBEhMKCW8yX3N0cmluZxgDIAEoCUgBQgQKAm8xQgQKAm8y",
+            "KlUKDE5lZ2F0aXZlRW51bRIWChJORUdBVElWRV9FTlVNX1pFUk8QABIWCglG",
+            "aXZlQmVsb3cQ+///////////ARIVCghNaW51c09uZRD///////////8BKi4K",
+            "DkRlcHJlY2F0ZWRFbnVtEhMKD0RFUFJFQ0FURURfWkVSTxAAEgcKA29uZRAB",
             "Qh9IAaoCGlVuaXRUZXN0Lklzc3Vlcy5UZXN0UHJvdG9zYgZwcm90bzM="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { },
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
index bf4590ad..49c357ea 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestProto3.cs
@@ -21,132 +21,132 @@ namespace Google.Protobuf.TestProtos {
     static UnittestProto3() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "CiVnb29nbGUvcHJvdG9idWYvdW5pdHRlc3RfcHJvdG8zLnByb3RvEhFwcm90", 
-            "b2J1Zl91bml0dGVzdBosZ29vZ2xlL3Byb3RvYnVmL3VuaXR0ZXN0X2ltcG9y", 
-            "dF9wcm90bzMucHJvdG8i8A8KDFRlc3RBbGxUeXBlcxIUCgxzaW5nbGVfaW50", 
-            "MzIYASABKAUSFAoMc2luZ2xlX2ludDY0GAIgASgDEhUKDXNpbmdsZV91aW50", 
-            "MzIYAyABKA0SFQoNc2luZ2xlX3VpbnQ2NBgEIAEoBBIVCg1zaW5nbGVfc2lu", 
-            "dDMyGAUgASgREhUKDXNpbmdsZV9zaW50NjQYBiABKBISFgoOc2luZ2xlX2Zp", 
-            "eGVkMzIYByABKAcSFgoOc2luZ2xlX2ZpeGVkNjQYCCABKAYSFwoPc2luZ2xl", 
-            "X3NmaXhlZDMyGAkgASgPEhcKD3NpbmdsZV9zZml4ZWQ2NBgKIAEoEBIUCgxz", 
-            "aW5nbGVfZmxvYXQYCyABKAISFQoNc2luZ2xlX2RvdWJsZRgMIAEoARITCgtz", 
-            "aW5nbGVfYm9vbBgNIAEoCBIVCg1zaW5nbGVfc3RyaW5nGA4gASgJEhQKDHNp", 
-            "bmdsZV9ieXRlcxgPIAEoDBJMChVzaW5nbGVfbmVzdGVkX21lc3NhZ2UYEiAB", 
-            "KAsyLS5wcm90b2J1Zl91bml0dGVzdC5UZXN0QWxsVHlwZXMuTmVzdGVkTWVz", 
-            "c2FnZRJBChZzaW5nbGVfZm9yZWlnbl9tZXNzYWdlGBMgASgLMiEucHJvdG9i", 
-            "dWZfdW5pdHRlc3QuRm9yZWlnbk1lc3NhZ2USRgoVc2luZ2xlX2ltcG9ydF9t", 
-            "ZXNzYWdlGBQgASgLMicucHJvdG9idWZfdW5pdHRlc3RfaW1wb3J0LkltcG9y", 
-            "dE1lc3NhZ2USRgoSc2luZ2xlX25lc3RlZF9lbnVtGBUgASgOMioucHJvdG9i", 
-            "dWZfdW5pdHRlc3QuVGVzdEFsbFR5cGVzLk5lc3RlZEVudW0SOwoTc2luZ2xl", 
-            "X2ZvcmVpZ25fZW51bRgWIAEoDjIeLnByb3RvYnVmX3VuaXR0ZXN0LkZvcmVp", 
-            "Z25FbnVtEkAKEnNpbmdsZV9pbXBvcnRfZW51bRgXIAEoDjIkLnByb3RvYnVm", 
-            "X3VuaXR0ZXN0X2ltcG9ydC5JbXBvcnRFbnVtElMKHHNpbmdsZV9wdWJsaWNf", 
-            "aW1wb3J0X21lc3NhZ2UYGiABKAsyLS5wcm90b2J1Zl91bml0dGVzdF9pbXBv", 
-            "cnQuUHVibGljSW1wb3J0TWVzc2FnZRIWCg5yZXBlYXRlZF9pbnQzMhgfIAMo", 
-            "BRIWCg5yZXBlYXRlZF9pbnQ2NBggIAMoAxIXCg9yZXBlYXRlZF91aW50MzIY", 
-            "ISADKA0SFwoPcmVwZWF0ZWRfdWludDY0GCIgAygEEhcKD3JlcGVhdGVkX3Np", 
-            "bnQzMhgjIAMoERIXCg9yZXBlYXRlZF9zaW50NjQYJCADKBISGAoQcmVwZWF0", 
-            "ZWRfZml4ZWQzMhglIAMoBxIYChByZXBlYXRlZF9maXhlZDY0GCYgAygGEhkK", 
-            "EXJlcGVhdGVkX3NmaXhlZDMyGCcgAygPEhkKEXJlcGVhdGVkX3NmaXhlZDY0", 
-            "GCggAygQEhYKDnJlcGVhdGVkX2Zsb2F0GCkgAygCEhcKD3JlcGVhdGVkX2Rv", 
-            "dWJsZRgqIAMoARIVCg1yZXBlYXRlZF9ib29sGCsgAygIEhcKD3JlcGVhdGVk", 
-            "X3N0cmluZxgsIAMoCRIWCg5yZXBlYXRlZF9ieXRlcxgtIAMoDBJOChdyZXBl", 
-            "YXRlZF9uZXN0ZWRfbWVzc2FnZRgwIAMoCzItLnByb3RvYnVmX3VuaXR0ZXN0", 
-            "LlRlc3RBbGxUeXBlcy5OZXN0ZWRNZXNzYWdlEkMKGHJlcGVhdGVkX2ZvcmVp", 
-            "Z25fbWVzc2FnZRgxIAMoCzIhLnByb3RvYnVmX3VuaXR0ZXN0LkZvcmVpZ25N", 
-            "ZXNzYWdlEkgKF3JlcGVhdGVkX2ltcG9ydF9tZXNzYWdlGDIgAygLMicucHJv", 
-            "dG9idWZfdW5pdHRlc3RfaW1wb3J0LkltcG9ydE1lc3NhZ2USSAoUcmVwZWF0", 
-            "ZWRfbmVzdGVkX2VudW0YMyADKA4yKi5wcm90b2J1Zl91bml0dGVzdC5UZXN0", 
-            "QWxsVHlwZXMuTmVzdGVkRW51bRI9ChVyZXBlYXRlZF9mb3JlaWduX2VudW0Y", 
-            "NCADKA4yHi5wcm90b2J1Zl91bml0dGVzdC5Gb3JlaWduRW51bRJCChRyZXBl", 
-            "YXRlZF9pbXBvcnRfZW51bRg1IAMoDjIkLnByb3RvYnVmX3VuaXR0ZXN0X2lt", 
-            "cG9ydC5JbXBvcnRFbnVtElUKHnJlcGVhdGVkX3B1YmxpY19pbXBvcnRfbWVz", 
-            "c2FnZRg2IAMoCzItLnByb3RvYnVmX3VuaXR0ZXN0X2ltcG9ydC5QdWJsaWNJ", 
-            "bXBvcnRNZXNzYWdlEhYKDG9uZW9mX3VpbnQzMhhvIAEoDUgAEk0KFG9uZW9m", 
-            "X25lc3RlZF9tZXNzYWdlGHAgASgLMi0ucHJvdG9idWZfdW5pdHRlc3QuVGVz", 
-            "dEFsbFR5cGVzLk5lc3RlZE1lc3NhZ2VIABIWCgxvbmVvZl9zdHJpbmcYcSAB", 
-            "KAlIABIVCgtvbmVvZl9ieXRlcxhyIAEoDEgAGhsKDU5lc3RlZE1lc3NhZ2US", 
-            "CgoCYmIYASABKAUiVgoKTmVzdGVkRW51bRIbChdORVNURURfRU5VTV9VTlNQ", 
-            "RUNJRklFRBAAEgcKA0ZPTxABEgcKA0JBUhACEgcKA0JBWhADEhAKA05FRxD/", 
-            "//////////8BQg0KC29uZW9mX2ZpZWxkIrsBChJOZXN0ZWRUZXN0QWxsVHlw", 
-            "ZXMSNAoFY2hpbGQYASABKAsyJS5wcm90b2J1Zl91bml0dGVzdC5OZXN0ZWRU", 
-            "ZXN0QWxsVHlwZXMSMAoHcGF5bG9hZBgCIAEoCzIfLnByb3RvYnVmX3VuaXR0", 
-            "ZXN0LlRlc3RBbGxUeXBlcxI9Cg5yZXBlYXRlZF9jaGlsZBgDIAMoCzIlLnBy", 
-            "b3RvYnVmX3VuaXR0ZXN0Lk5lc3RlZFRlc3RBbGxUeXBlcyI0ChRUZXN0RGVw", 
-            "cmVjYXRlZEZpZWxkcxIcChBkZXByZWNhdGVkX2ludDMyGAEgASgFQgIYASIb", 
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+            "////ARIVCghTUEFSU0VfRRC03vz///////8BEgwKCFNQQVJTRV9HEAIymQEK",
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             "+AEBqgIaR29vZ2xlLlByb3RvYnVmLlRlc3RQcm90b3NiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.TestProtos.UnittestImportProto3.Descriptor, },
diff --git a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
index 16634e03..5a7c4489 100644
--- a/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
+++ b/csharp/src/Google.Protobuf.Test/TestProtos/UnittestWellKnownTypes.cs
@@ -21,141 +21,141 @@ namespace Google.Protobuf.TestProtos {
     static UnittestWellKnownTypes() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
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             "dFByb3Rvc2IGcHJvdG8z"));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.Proto.Any.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Api.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Duration.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Empty.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.FieldMask.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.SourceContext.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Struct.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Timestamp.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Type.Descriptor, global::Google.Protobuf.WellKnownTypes.Wrappers.Descriptor, },
diff --git a/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs b/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs
index f9158cab..5072abe2 100644
--- a/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs
+++ b/csharp/src/Google.Protobuf/Reflection/DescriptorProtoFile.cs
@@ -21,117 +21,117 @@ namespace Google.Protobuf.Reflection {
     static DescriptorProtoFile() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
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+            "X3NlcnZpY2VzGBEgASgIOgVmYWxzZRIiChNweV9nZW5lcmljX3NlcnZpY2Vz",
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+            "Y19lbmFibGVfYXJlbmFzGB8gASgIOgVmYWxzZRIZChFvYmpjX2NsYXNzX3By",
+            "ZWZpeBgkIAEoCRIYChBjc2hhcnBfbmFtZXNwYWNlGCUgASgJEicKH2phdmFu",
+            "YW5vX3VzZV9kZXByZWNhdGVkX3BhY2thZ2UYJiABKAgSQwoUdW5pbnRlcnBy",
+            "ZXRlZF9vcHRpb24Y5wcgAygLMiQuZ29vZ2xlLnByb3RvYnVmLlVuaW50ZXJw",
+            "cmV0ZWRPcHRpb24iOgoMT3B0aW1pemVNb2RlEgkKBVNQRUVEEAESDQoJQ09E",
+            "RV9TSVpFEAISEAoMTElURV9SVU5USU1FEAMqCQjoBxCAgICAAiLmAQoOTWVz",
+            "c2FnZU9wdGlvbnMSJgoXbWVzc2FnZV9zZXRfd2lyZV9mb3JtYXQYASABKAg6",
+            "BWZhbHNlEi4KH25vX3N0YW5kYXJkX2Rlc2NyaXB0b3JfYWNjZXNzb3IYAiAB",
+            "KAg6BWZhbHNlEhkKCmRlcHJlY2F0ZWQYAyABKAg6BWZhbHNlEhEKCW1hcF9l",
+            "bnRyeRgHIAEoCBJDChR1bmludGVycHJldGVkX29wdGlvbhjnByADKAsyJC5n",
+            "b29nbGUucHJvdG9idWYuVW5pbnRlcnByZXRlZE9wdGlvbioJCOgHEICAgIAC",
+            "IpgDCgxGaWVsZE9wdGlvbnMSOgoFY3R5cGUYASABKA4yIy5nb29nbGUucHJv",
+            "dG9idWYuRmllbGRPcHRpb25zLkNUeXBlOgZTVFJJTkcSDgoGcGFja2VkGAIg",
+            "ASgIEj8KBmpzdHlwZRgGIAEoDjIkLmdvb2dsZS5wcm90b2J1Zi5GaWVsZE9w",
+            "dGlvbnMuSlNUeXBlOglKU19OT1JNQUwSEwoEbGF6eRgFIAEoCDoFZmFsc2US",
+            "GQoKZGVwcmVjYXRlZBgDIAEoCDoFZmFsc2USEwoEd2VhaxgKIAEoCDoFZmFs",
+            "c2USQwoUdW5pbnRlcnByZXRlZF9vcHRpb24Y5wcgAygLMiQuZ29vZ2xlLnBy",
+            "b3RvYnVmLlVuaW50ZXJwcmV0ZWRPcHRpb24iLwoFQ1R5cGUSCgoGU1RSSU5H",
+            "EAASCAoEQ09SRBABEhAKDFNUUklOR19QSUVDRRACIjUKBkpTVHlwZRINCglK",
+            "U19OT1JNQUwQABINCglKU19TVFJJTkcQARINCglKU19OVU1CRVIQAioJCOgH",
+            "EICAgIACIo0BCgtFbnVtT3B0aW9ucxITCgthbGxvd19hbGlhcxgCIAEoCBIZ",
+            "CgpkZXByZWNhdGVkGAMgASgIOgVmYWxzZRJDChR1bmludGVycHJldGVkX29w",
+            "dGlvbhjnByADKAsyJC5nb29nbGUucHJvdG9idWYuVW5pbnRlcnByZXRlZE9w",
+            "dGlvbioJCOgHEICAgIACIn0KEEVudW1WYWx1ZU9wdGlvbnMSGQoKZGVwcmVj",
+            "YXRlZBgBIAEoCDoFZmFsc2USQwoUdW5pbnRlcnByZXRlZF9vcHRpb24Y5wcg",
+            "AygLMiQuZ29vZ2xlLnByb3RvYnVmLlVuaW50ZXJwcmV0ZWRPcHRpb24qCQjo",
+            "BxCAgICAAiJ7Cg5TZXJ2aWNlT3B0aW9ucxIZCgpkZXByZWNhdGVkGCEgASgI",
+            "OgVmYWxzZRJDChR1bmludGVycHJldGVkX29wdGlvbhjnByADKAsyJC5nb29n",
+            "bGUucHJvdG9idWYuVW5pbnRlcnByZXRlZE9wdGlvbioJCOgHEICAgIACInoK",
+            "DU1ldGhvZE9wdGlvbnMSGQoKZGVwcmVjYXRlZBghIAEoCDoFZmFsc2USQwoU",
+            "dW5pbnRlcnByZXRlZF9vcHRpb24Y5wcgAygLMiQuZ29vZ2xlLnByb3RvYnVm",
+            "LlVuaW50ZXJwcmV0ZWRPcHRpb24qCQjoBxCAgICAAiKeAgoTVW5pbnRlcnBy",
+            "ZXRlZE9wdGlvbhI7CgRuYW1lGAIgAygLMi0uZ29vZ2xlLnByb3RvYnVmLlVu",
+            "aW50ZXJwcmV0ZWRPcHRpb24uTmFtZVBhcnQSGAoQaWRlbnRpZmllcl92YWx1",
+            "ZRgDIAEoCRIaChJwb3NpdGl2ZV9pbnRfdmFsdWUYBCABKAQSGgoSbmVnYXRp",
+            "dmVfaW50X3ZhbHVlGAUgASgDEhQKDGRvdWJsZV92YWx1ZRgGIAEoARIUCgxz",
+            "dHJpbmdfdmFsdWUYByABKAwSFwoPYWdncmVnYXRlX3ZhbHVlGAggASgJGjMK",
+            "CE5hbWVQYXJ0EhEKCW5hbWVfcGFydBgBIAIoCRIUCgxpc19leHRlbnNpb24Y",
+            "AiACKAgi1QEKDlNvdXJjZUNvZGVJbmZvEjoKCGxvY2F0aW9uGAEgAygLMigu",
+            "Z29vZ2xlLnByb3RvYnVmLlNvdXJjZUNvZGVJbmZvLkxvY2F0aW9uGoYBCghM",
+            "b2NhdGlvbhIQCgRwYXRoGAEgAygFQgIQARIQCgRzcGFuGAIgAygFQgIQARIY",
+            "ChBsZWFkaW5nX2NvbW1lbnRzGAMgASgJEhkKEXRyYWlsaW5nX2NvbW1lbnRz",
+            "GAQgASgJEiEKGWxlYWRpbmdfZGV0YWNoZWRfY29tbWVudHMYBiADKAlCWAoT",
+            "Y29tLmdvb2dsZS5wcm90b2J1ZkIQRGVzY3JpcHRvclByb3Rvc0gBWgpkZXNj",
+            "cmlwdG9yogIDR1BCqgIaR29vZ2xlLlByb3RvYnVmLlJlZmxlY3Rpb24="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { },
           new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs
index 204b37cf..51ff2d4e 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Any.cs
@@ -23,9 +23,9 @@ namespace Google.Protobuf.WellKnownTypes {
       static Any() {
         byte[] descriptorData = global::System.Convert.FromBase64String(
             string.Concat(
-              "Chlnb29nbGUvcHJvdG9idWYvYW55LnByb3RvEg9nb29nbGUucHJvdG9idWYi", 
-              "JgoDQW55EhAKCHR5cGVfdXJsGAEgASgJEg0KBXZhbHVlGAIgASgMQksKE2Nv", 
-              "bS5nb29nbGUucHJvdG9idWZCCEFueVByb3RvUAGgAQGiAgNHUEKqAh5Hb29n", 
+              "Chlnb29nbGUvcHJvdG9idWYvYW55LnByb3RvEg9nb29nbGUucHJvdG9idWYi",
+              "JgoDQW55EhAKCHR5cGVfdXJsGAEgASgJEg0KBXZhbHVlGAIgASgMQksKE2Nv",
+              "bS5nb29nbGUucHJvdG9idWZCCEFueVByb3RvUAGgAQGiAgNHUEKqAh5Hb29n",
               "bGUuUHJvdG9idWYuV2VsbEtub3duVHlwZXNiBnByb3RvMw=="));
         descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
             new pbr::FileDescriptor[] { },
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs
index a5f95093..4d06ff35 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Api.cs
@@ -23,24 +23,28 @@ namespace Google.Protobuf.WellKnownTypes {
       static Api() {
         byte[] descriptorData = global::System.Convert.FromBase64String(
             string.Concat(
-              "Chlnb29nbGUvcHJvdG9idWYvYXBpLnByb3RvEg9nb29nbGUucHJvdG9idWYa", 
-              "JGdvb2dsZS9wcm90b2J1Zi9zb3VyY2VfY29udGV4dC5wcm90bxoaZ29vZ2xl", 
-              "L3Byb3RvYnVmL3R5cGUucHJvdG8isAEKA0FwaRIMCgRuYW1lGAEgASgJEigK", 
-              "B21ldGhvZHMYAiADKAsyFy5nb29nbGUucHJvdG9idWYuTWV0aG9kEigKB29w", 
-              "dGlvbnMYAyADKAsyFy5nb29nbGUucHJvdG9idWYuT3B0aW9uEg8KB3ZlcnNp", 
-              "b24YBCABKAkSNgoOc291cmNlX2NvbnRleHQYBSABKAsyHi5nb29nbGUucHJv", 
-              "dG9idWYuU291cmNlQ29udGV4dCKsAQoGTWV0aG9kEgwKBG5hbWUYASABKAkS", 
-              "GAoQcmVxdWVzdF90eXBlX3VybBgCIAEoCRIZChFyZXF1ZXN0X3N0cmVhbWlu", 
-              "ZxgDIAEoCBIZChFyZXNwb25zZV90eXBlX3VybBgEIAEoCRIaChJyZXNwb25z", 
-              "ZV9zdHJlYW1pbmcYBSABKAgSKAoHb3B0aW9ucxgGIAMoCzIXLmdvb2dsZS5w", 
-              "cm90b2J1Zi5PcHRpb25CSAoTY29tLmdvb2dsZS5wcm90b2J1ZkIIQXBpUHJv", 
-              "dG9QAaICA0dQQqoCHkdvb2dsZS5Qcm90b2J1Zi5XZWxsS25vd25UeXBlc2IG", 
-              "cHJvdG8z"));
+              "Chlnb29nbGUvcHJvdG9idWYvYXBpLnByb3RvEg9nb29nbGUucHJvdG9idWYa",
+              "JGdvb2dsZS9wcm90b2J1Zi9zb3VyY2VfY29udGV4dC5wcm90bxoaZ29vZ2xl",
+              "L3Byb3RvYnVmL3R5cGUucHJvdG8igQIKA0FwaRIMCgRuYW1lGAEgASgJEigK",
+              "B21ldGhvZHMYAiADKAsyFy5nb29nbGUucHJvdG9idWYuTWV0aG9kEigKB29w",
+              "dGlvbnMYAyADKAsyFy5nb29nbGUucHJvdG9idWYuT3B0aW9uEg8KB3ZlcnNp",
+              "b24YBCABKAkSNgoOc291cmNlX2NvbnRleHQYBSABKAsyHi5nb29nbGUucHJv",
+              "dG9idWYuU291cmNlQ29udGV4dBImCgZtaXhpbnMYBiADKAsyFi5nb29nbGUu",
+              "cHJvdG9idWYuTWl4aW4SJwoGc3ludGF4GAcgASgOMhcuZ29vZ2xlLnByb3Rv",
+              "YnVmLlN5bnRheCLVAQoGTWV0aG9kEgwKBG5hbWUYASABKAkSGAoQcmVxdWVz",
+              "dF90eXBlX3VybBgCIAEoCRIZChFyZXF1ZXN0X3N0cmVhbWluZxgDIAEoCBIZ",
+              "ChFyZXNwb25zZV90eXBlX3VybBgEIAEoCRIaChJyZXNwb25zZV9zdHJlYW1p",
+              "bmcYBSABKAgSKAoHb3B0aW9ucxgGIAMoCzIXLmdvb2dsZS5wcm90b2J1Zi5P",
+              "cHRpb24SJwoGc3ludGF4GAcgASgOMhcuZ29vZ2xlLnByb3RvYnVmLlN5bnRh",
+              "eCIjCgVNaXhpbhIMCgRuYW1lGAEgASgJEgwKBHJvb3QYAiABKAlCSwoTY29t",
+              "Lmdvb2dsZS5wcm90b2J1ZkIIQXBpUHJvdG9QAaABAaICA0dQQqoCHkdvb2ds",
+              "ZS5Qcm90b2J1Zi5XZWxsS25vd25UeXBlc2IGcHJvdG8z"));
         descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
             new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.Proto.SourceContext.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.Type.Descriptor, },
             new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
-              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Api), new[]{ "Name", "Methods", "Options", "Version", "SourceContext" }, null, null, null),
-              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Method), new[]{ "Name", "RequestTypeUrl", "RequestStreaming", "ResponseTypeUrl", "ResponseStreaming", "Options" }, null, null, null)
+              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Api), new[]{ "Name", "Methods", "Options", "Version", "SourceContext", "Mixins", "Syntax" }, null, null, null),
+              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Method), new[]{ "Name", "RequestTypeUrl", "RequestStreaming", "ResponseTypeUrl", "ResponseStreaming", "Options", "Syntax" }, null, null, null),
+              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Mixin), new[]{ "Name", "Root" }, null, null, null)
             }));
       }
       #endregion
@@ -73,6 +77,8 @@ namespace Google.Protobuf.WellKnownTypes {
       options_ = other.options_.Clone();
       version_ = other.version_;
       SourceContext = other.sourceContext_ != null ? other.SourceContext.Clone() : null;
+      mixins_ = other.mixins_.Clone();
+      syntax_ = other.syntax_;
     }
 
     public Api Clone() {
@@ -122,6 +128,23 @@ namespace Google.Protobuf.WellKnownTypes {
       }
     }
 
+    public const int MixinsFieldNumber = 6;
+    private static readonly pb::FieldCodec<global::Google.Protobuf.WellKnownTypes.Mixin> _repeated_mixins_codec
+        = pb::FieldCodec.ForMessage(50, global::Google.Protobuf.WellKnownTypes.Mixin.Parser);
+    private readonly pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Mixin> mixins_ = new pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Mixin>();
+    public pbc::RepeatedField<global::Google.Protobuf.WellKnownTypes.Mixin> Mixins {
+      get { return mixins_; }
+    }
+
+    public const int SyntaxFieldNumber = 7;
+    private global::Google.Protobuf.WellKnownTypes.Syntax syntax_ = global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2;
+    public global::Google.Protobuf.WellKnownTypes.Syntax Syntax {
+      get { return syntax_; }
+      set {
+        syntax_ = value;
+      }
+    }
+
     public override bool Equals(object other) {
       return Equals(other as Api);
     }
@@ -138,6 +161,8 @@ namespace Google.Protobuf.WellKnownTypes {
       if(!options_.Equals(other.options_)) return false;
       if (Version != other.Version) return false;
       if (!object.Equals(SourceContext, other.SourceContext)) return false;
+      if(!mixins_.Equals(other.mixins_)) return false;
+      if (Syntax != other.Syntax) return false;
       return true;
     }
 
@@ -148,6 +173,8 @@ namespace Google.Protobuf.WellKnownTypes {
       hash ^= options_.GetHashCode();
       if (Version.Length != 0) hash ^= Version.GetHashCode();
       if (sourceContext_ != null) hash ^= SourceContext.GetHashCode();
+      hash ^= mixins_.GetHashCode();
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) hash ^= Syntax.GetHashCode();
       return hash;
     }
 
@@ -170,6 +197,11 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(42);
         output.WriteMessage(SourceContext);
       }
+      mixins_.WriteTo(output, _repeated_mixins_codec);
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        output.WriteRawTag(56);
+        output.WriteEnum((int) Syntax);
+      }
     }
 
     public int CalculateSize() {
@@ -185,6 +217,10 @@ namespace Google.Protobuf.WellKnownTypes {
       if (sourceContext_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(SourceContext);
       }
+      size += mixins_.CalculateSize(_repeated_mixins_codec);
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Syntax);
+      }
       return size;
     }
 
@@ -206,6 +242,10 @@ namespace Google.Protobuf.WellKnownTypes {
         }
         SourceContext.MergeFrom(other.SourceContext);
       }
+      mixins_.Add(other.mixins_);
+      if (other.Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        Syntax = other.Syntax;
+      }
     }
 
     public void MergeFrom(pb::CodedInputStream input) {
@@ -238,6 +278,14 @@ namespace Google.Protobuf.WellKnownTypes {
             input.ReadMessage(sourceContext_);
             break;
           }
+          case 50: {
+            mixins_.AddEntriesFrom(input, _repeated_mixins_codec);
+            break;
+          }
+          case 56: {
+            syntax_ = (global::Google.Protobuf.WellKnownTypes.Syntax) input.ReadEnum();
+            break;
+          }
         }
       }
     }
@@ -270,6 +318,7 @@ namespace Google.Protobuf.WellKnownTypes {
       responseTypeUrl_ = other.responseTypeUrl_;
       responseStreaming_ = other.responseStreaming_;
       options_ = other.options_.Clone();
+      syntax_ = other.syntax_;
     }
 
     public Method Clone() {
@@ -329,6 +378,15 @@ namespace Google.Protobuf.WellKnownTypes {
       get { return options_; }
     }
 
+    public const int SyntaxFieldNumber = 7;
+    private global::Google.Protobuf.WellKnownTypes.Syntax syntax_ = global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2;
+    public global::Google.Protobuf.WellKnownTypes.Syntax Syntax {
+      get { return syntax_; }
+      set {
+        syntax_ = value;
+      }
+    }
+
     public override bool Equals(object other) {
       return Equals(other as Method);
     }
@@ -346,6 +404,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (ResponseTypeUrl != other.ResponseTypeUrl) return false;
       if (ResponseStreaming != other.ResponseStreaming) return false;
       if(!options_.Equals(other.options_)) return false;
+      if (Syntax != other.Syntax) return false;
       return true;
     }
 
@@ -357,6 +416,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (ResponseTypeUrl.Length != 0) hash ^= ResponseTypeUrl.GetHashCode();
       if (ResponseStreaming != false) hash ^= ResponseStreaming.GetHashCode();
       hash ^= options_.GetHashCode();
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) hash ^= Syntax.GetHashCode();
       return hash;
     }
 
@@ -386,6 +446,10 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteBool(ResponseStreaming);
       }
       options_.WriteTo(output, _repeated_options_codec);
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        output.WriteRawTag(56);
+        output.WriteEnum((int) Syntax);
+      }
     }
 
     public int CalculateSize() {
@@ -406,6 +470,9 @@ namespace Google.Protobuf.WellKnownTypes {
         size += 1 + 1;
       }
       size += options_.CalculateSize(_repeated_options_codec);
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Syntax);
+      }
       return size;
     }
 
@@ -429,6 +496,9 @@ namespace Google.Protobuf.WellKnownTypes {
         ResponseStreaming = other.ResponseStreaming;
       }
       options_.Add(other.options_);
+      if (other.Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        Syntax = other.Syntax;
+      }
     }
 
     public void MergeFrom(pb::CodedInputStream input) {
@@ -462,6 +532,138 @@ namespace Google.Protobuf.WellKnownTypes {
             options_.AddEntriesFrom(input, _repeated_options_codec);
             break;
           }
+          case 56: {
+            syntax_ = (global::Google.Protobuf.WellKnownTypes.Syntax) input.ReadEnum();
+            break;
+          }
+        }
+      }
+    }
+
+  }
+
+  [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
+  public sealed partial class Mixin : pb::IMessage<Mixin> {
+    private static readonly pb::MessageParser<Mixin> _parser = new pb::MessageParser<Mixin>(() => new Mixin());
+    public static pb::MessageParser<Mixin> Parser { get { return _parser; } }
+
+    public static pbr::MessageDescriptor Descriptor {
+      get { return global::Google.Protobuf.WellKnownTypes.Proto.Api.Descriptor.MessageTypes[2]; }
+    }
+
+    pbr::MessageDescriptor pb::IMessage.Descriptor {
+      get { return Descriptor; }
+    }
+
+    public Mixin() {
+      OnConstruction();
+    }
+
+    partial void OnConstruction();
+
+    public Mixin(Mixin other) : this() {
+      name_ = other.name_;
+      root_ = other.root_;
+    }
+
+    public Mixin Clone() {
+      return new Mixin(this);
+    }
+
+    public const int NameFieldNumber = 1;
+    private string name_ = "";
+    public string Name {
+      get { return name_; }
+      set {
+        name_ = pb::Preconditions.CheckNotNull(value, "value");
+      }
+    }
+
+    public const int RootFieldNumber = 2;
+    private string root_ = "";
+    public string Root {
+      get { return root_; }
+      set {
+        root_ = pb::Preconditions.CheckNotNull(value, "value");
+      }
+    }
+
+    public override bool Equals(object other) {
+      return Equals(other as Mixin);
+    }
+
+    public bool Equals(Mixin other) {
+      if (ReferenceEquals(other, null)) {
+        return false;
+      }
+      if (ReferenceEquals(other, this)) {
+        return true;
+      }
+      if (Name != other.Name) return false;
+      if (Root != other.Root) return false;
+      return true;
+    }
+
+    public override int GetHashCode() {
+      int hash = 1;
+      if (Name.Length != 0) hash ^= Name.GetHashCode();
+      if (Root.Length != 0) hash ^= Root.GetHashCode();
+      return hash;
+    }
+
+    public override string ToString() {
+      return pb::JsonFormatter.Default.Format(this);
+    }
+
+    public void WriteTo(pb::CodedOutputStream output) {
+      if (Name.Length != 0) {
+        output.WriteRawTag(10);
+        output.WriteString(Name);
+      }
+      if (Root.Length != 0) {
+        output.WriteRawTag(18);
+        output.WriteString(Root);
+      }
+    }
+
+    public int CalculateSize() {
+      int size = 0;
+      if (Name.Length != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeStringSize(Name);
+      }
+      if (Root.Length != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeStringSize(Root);
+      }
+      return size;
+    }
+
+    public void MergeFrom(Mixin other) {
+      if (other == null) {
+        return;
+      }
+      if (other.Name.Length != 0) {
+        Name = other.Name;
+      }
+      if (other.Root.Length != 0) {
+        Root = other.Root;
+      }
+    }
+
+    public void MergeFrom(pb::CodedInputStream input) {
+      uint tag;
+      while ((tag = input.ReadTag()) != 0) {
+        switch(tag) {
+          default:
+            input.SkipLastField();
+            break;
+          case 10: {
+            Name = input.ReadString();
+            break;
+          }
+          case 18: {
+            Root = input.ReadString();
+            break;
+          }
         }
       }
     }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs
index aa34f2d8..fce1de0b 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Duration.cs
@@ -23,10 +23,10 @@ namespace Google.Protobuf.WellKnownTypes {
       static Duration() {
         byte[] descriptorData = global::System.Convert.FromBase64String(
             string.Concat(
-              "Ch5nb29nbGUvcHJvdG9idWYvZHVyYXRpb24ucHJvdG8SD2dvb2dsZS5wcm90", 
-              "b2J1ZiIqCghEdXJhdGlvbhIPCgdzZWNvbmRzGAEgASgDEg0KBW5hbm9zGAIg", 
-              "ASgFQlAKE2NvbS5nb29nbGUucHJvdG9idWZCDUR1cmF0aW9uUHJvdG9QAaAB", 
-              "AaICA0dQQqoCHkdvb2dsZS5Qcm90b2J1Zi5XZWxsS25vd25UeXBlc2IGcHJv", 
+              "Ch5nb29nbGUvcHJvdG9idWYvZHVyYXRpb24ucHJvdG8SD2dvb2dsZS5wcm90",
+              "b2J1ZiIqCghEdXJhdGlvbhIPCgdzZWNvbmRzGAEgASgDEg0KBW5hbm9zGAIg",
+              "ASgFQlAKE2NvbS5nb29nbGUucHJvdG9idWZCDUR1cmF0aW9uUHJvdG9QAaAB",
+              "AaICA0dQQqoCHkdvb2dsZS5Qcm90b2J1Zi5XZWxsS25vd25UeXBlc2IGcHJv",
               "dG8z"));
         descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
             new pbr::FileDescriptor[] { },
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs
index 7d699c1d..2d87aaaa 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Empty.cs
@@ -23,10 +23,10 @@ namespace Google.Protobuf.WellKnownTypes {
       static Empty() {
         byte[] descriptorData = global::System.Convert.FromBase64String(
             string.Concat(
-              "Chtnb29nbGUvcHJvdG9idWYvZW1wdHkucHJvdG8SD2dvb2dsZS5wcm90b2J1", 
-              "ZiIHCgVFbXB0eUJKChNjb20uZ29vZ2xlLnByb3RvYnVmQgpFbXB0eVByb3Rv", 
-              "UAGiAgNHUEKqAh5Hb29nbGUuUHJvdG9idWYuV2VsbEtub3duVHlwZXNiBnBy", 
-              "b3RvMw=="));
+              "Chtnb29nbGUvcHJvdG9idWYvZW1wdHkucHJvdG8SD2dvb2dsZS5wcm90b2J1",
+              "ZiIHCgVFbXB0eUJNChNjb20uZ29vZ2xlLnByb3RvYnVmQgpFbXB0eVByb3Rv",
+              "UAGgAQGiAgNHUEKqAh5Hb29nbGUuUHJvdG9idWYuV2VsbEtub3duVHlwZXNi",
+              "BnByb3RvMw=="));
         descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
             new pbr::FileDescriptor[] { },
             new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs b/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
index 0dac4403..a73a6360 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/FieldMask.cs
@@ -23,10 +23,10 @@ namespace Google.Protobuf.WellKnownTypes {
       static FieldMask() {
         byte[] descriptorData = global::System.Convert.FromBase64String(
             string.Concat(
-              "CiBnb29nbGUvcHJvdG9idWYvZmllbGRfbWFzay5wcm90bxIPZ29vZ2xlLnBy", 
-              "b3RvYnVmIhoKCUZpZWxkTWFzaxINCgVwYXRocxgBIAMoCUJOChNjb20uZ29v", 
-              "Z2xlLnByb3RvYnVmQg5GaWVsZE1hc2tQcm90b1ABogIDR1BCqgIeR29vZ2xl", 
-              "LlByb3RvYnVmLldlbGxLbm93blR5cGVzYgZwcm90bzM="));
+              "CiBnb29nbGUvcHJvdG9idWYvZmllbGRfbWFzay5wcm90bxIPZ29vZ2xlLnBy",
+              "b3RvYnVmIhoKCUZpZWxkTWFzaxINCgVwYXRocxgBIAMoCUJRChNjb20uZ29v",
+              "Z2xlLnByb3RvYnVmQg5GaWVsZE1hc2tQcm90b1ABoAEBogIDR1BCqgIeR29v",
+              "Z2xlLlByb3RvYnVmLldlbGxLbm93blR5cGVzYgZwcm90bzM="));
         descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
             new pbr::FileDescriptor[] { },
             new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs b/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs
index 8347999d..d80c50f3 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/SourceContext.cs
@@ -23,11 +23,11 @@ namespace Google.Protobuf.WellKnownTypes {
       static SourceContext() {
         byte[] descriptorData = global::System.Convert.FromBase64String(
             string.Concat(
-              "CiRnb29nbGUvcHJvdG9idWYvc291cmNlX2NvbnRleHQucHJvdG8SD2dvb2ds", 
-              "ZS5wcm90b2J1ZiIiCg1Tb3VyY2VDb250ZXh0EhEKCWZpbGVfbmFtZRgBIAEo", 
-              "CUJSChNjb20uZ29vZ2xlLnByb3RvYnVmQhJTb3VyY2VDb250ZXh0UHJvdG9Q", 
-              "AaICA0dQQqoCHkdvb2dsZS5Qcm90b2J1Zi5XZWxsS25vd25UeXBlc2IGcHJv", 
-              "dG8z"));
+              "CiRnb29nbGUvcHJvdG9idWYvc291cmNlX2NvbnRleHQucHJvdG8SD2dvb2ds",
+              "ZS5wcm90b2J1ZiIiCg1Tb3VyY2VDb250ZXh0EhEKCWZpbGVfbmFtZRgBIAEo",
+              "CUJVChNjb20uZ29vZ2xlLnByb3RvYnVmQhJTb3VyY2VDb250ZXh0UHJvdG9Q",
+              "AaABAaICA0dQQqoCHkdvb2dsZS5Qcm90b2J1Zi5XZWxsS25vd25UeXBlc2IG",
+              "cHJvdG8z"));
         descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
             new pbr::FileDescriptor[] { },
             new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs
index 1e8a8236..cab771c0 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Struct.cs
@@ -23,19 +23,19 @@ namespace Google.Protobuf.WellKnownTypes {
       static Struct() {
         byte[] descriptorData = global::System.Convert.FromBase64String(
             string.Concat(
-              "Chxnb29nbGUvcHJvdG9idWYvc3RydWN0LnByb3RvEg9nb29nbGUucHJvdG9i", 
-              "dWYihAEKBlN0cnVjdBIzCgZmaWVsZHMYASADKAsyIy5nb29nbGUucHJvdG9i", 
-              "dWYuU3RydWN0LkZpZWxkc0VudHJ5GkUKC0ZpZWxkc0VudHJ5EgsKA2tleRgB", 
-              "IAEoCRIlCgV2YWx1ZRgCIAEoCzIWLmdvb2dsZS5wcm90b2J1Zi5WYWx1ZToC", 
-              "OAEi6gEKBVZhbHVlEjAKCm51bGxfdmFsdWUYASABKA4yGi5nb29nbGUucHJv", 
-              "dG9idWYuTnVsbFZhbHVlSAASFgoMbnVtYmVyX3ZhbHVlGAIgASgBSAASFgoM", 
-              "c3RyaW5nX3ZhbHVlGAMgASgJSAASFAoKYm9vbF92YWx1ZRgEIAEoCEgAEi8K", 
-              "DHN0cnVjdF92YWx1ZRgFIAEoCzIXLmdvb2dsZS5wcm90b2J1Zi5TdHJ1Y3RI", 
-              "ABIwCgpsaXN0X3ZhbHVlGAYgASgLMhouZ29vZ2xlLnByb3RvYnVmLkxpc3RW", 
-              "YWx1ZUgAQgYKBGtpbmQiMwoJTGlzdFZhbHVlEiYKBnZhbHVlcxgBIAMoCzIW", 
-              "Lmdvb2dsZS5wcm90b2J1Zi5WYWx1ZSobCglOdWxsVmFsdWUSDgoKTlVMTF9W", 
-              "QUxVRRAAQk4KE2NvbS5nb29nbGUucHJvdG9idWZCC1N0cnVjdFByb3RvUAGg", 
-              "AQGiAgNHUEKqAh5Hb29nbGUuUHJvdG9idWYuV2VsbEtub3duVHlwZXNiBnBy", 
+              "Chxnb29nbGUvcHJvdG9idWYvc3RydWN0LnByb3RvEg9nb29nbGUucHJvdG9i",
+              "dWYihAEKBlN0cnVjdBIzCgZmaWVsZHMYASADKAsyIy5nb29nbGUucHJvdG9i",
+              "dWYuU3RydWN0LkZpZWxkc0VudHJ5GkUKC0ZpZWxkc0VudHJ5EgsKA2tleRgB",
+              "IAEoCRIlCgV2YWx1ZRgCIAEoCzIWLmdvb2dsZS5wcm90b2J1Zi5WYWx1ZToC",
+              "OAEi6gEKBVZhbHVlEjAKCm51bGxfdmFsdWUYASABKA4yGi5nb29nbGUucHJv",
+              "dG9idWYuTnVsbFZhbHVlSAASFgoMbnVtYmVyX3ZhbHVlGAIgASgBSAASFgoM",
+              "c3RyaW5nX3ZhbHVlGAMgASgJSAASFAoKYm9vbF92YWx1ZRgEIAEoCEgAEi8K",
+              "DHN0cnVjdF92YWx1ZRgFIAEoCzIXLmdvb2dsZS5wcm90b2J1Zi5TdHJ1Y3RI",
+              "ABIwCgpsaXN0X3ZhbHVlGAYgASgLMhouZ29vZ2xlLnByb3RvYnVmLkxpc3RW",
+              "YWx1ZUgAQgYKBGtpbmQiMwoJTGlzdFZhbHVlEiYKBnZhbHVlcxgBIAMoCzIW",
+              "Lmdvb2dsZS5wcm90b2J1Zi5WYWx1ZSobCglOdWxsVmFsdWUSDgoKTlVMTF9W",
+              "QUxVRRAAQk4KE2NvbS5nb29nbGUucHJvdG9idWZCC1N0cnVjdFByb3RvUAGg",
+              "AQGiAgNHUEKqAh5Hb29nbGUuUHJvdG9idWYuV2VsbEtub3duVHlwZXNiBnBy",
               "b3RvMw=="));
         descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
             new pbr::FileDescriptor[] { },
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
index d7c0954f..5c652dc2 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Timestamp.cs
@@ -23,10 +23,10 @@ namespace Google.Protobuf.WellKnownTypes {
       static Timestamp() {
         byte[] descriptorData = global::System.Convert.FromBase64String(
             string.Concat(
-              "Ch9nb29nbGUvcHJvdG9idWYvdGltZXN0YW1wLnByb3RvEg9nb29nbGUucHJv", 
-              "dG9idWYiKwoJVGltZXN0YW1wEg8KB3NlY29uZHMYASABKAMSDQoFbmFub3MY", 
-              "AiABKAVCUQoTY29tLmdvb2dsZS5wcm90b2J1ZkIOVGltZXN0YW1wUHJvdG9Q", 
-              "AaABAaICA0dQQqoCHkdvb2dsZS5Qcm90b2J1Zi5XZWxsS25vd25UeXBlc2IG", 
+              "Ch9nb29nbGUvcHJvdG9idWYvdGltZXN0YW1wLnByb3RvEg9nb29nbGUucHJv",
+              "dG9idWYiKwoJVGltZXN0YW1wEg8KB3NlY29uZHMYASABKAMSDQoFbmFub3MY",
+              "AiABKAVCUQoTY29tLmdvb2dsZS5wcm90b2J1ZkIOVGltZXN0YW1wUHJvdG9Q",
+              "AaABAaICA0dQQqoCHkdvb2dsZS5Qcm90b2J1Zi5XZWxsS25vd25UeXBlc2IG",
               "cHJvdG8z"));
         descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
             new pbr::FileDescriptor[] { },
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs
index ff2ecc57..eb676945 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Type.cs
@@ -23,43 +23,46 @@ namespace Google.Protobuf.WellKnownTypes {
       static Type() {
         byte[] descriptorData = global::System.Convert.FromBase64String(
             string.Concat(
-              "Chpnb29nbGUvcHJvdG9idWYvdHlwZS5wcm90bxIPZ29vZ2xlLnByb3RvYnVm", 
-              "Ghlnb29nbGUvcHJvdG9idWYvYW55LnByb3RvGiRnb29nbGUvcHJvdG9idWYv", 
-              "c291cmNlX2NvbnRleHQucHJvdG8irgEKBFR5cGUSDAoEbmFtZRgBIAEoCRIm", 
-              "CgZmaWVsZHMYAiADKAsyFi5nb29nbGUucHJvdG9idWYuRmllbGQSDgoGb25l", 
-              "b2ZzGAMgAygJEigKB29wdGlvbnMYBCADKAsyFy5nb29nbGUucHJvdG9idWYu", 
-              "T3B0aW9uEjYKDnNvdXJjZV9jb250ZXh0GAUgASgLMh4uZ29vZ2xlLnByb3Rv", 
-              "YnVmLlNvdXJjZUNvbnRleHQimwUKBUZpZWxkEikKBGtpbmQYASABKA4yGy5n", 
-              "b29nbGUucHJvdG9idWYuRmllbGQuS2luZBI3CgtjYXJkaW5hbGl0eRgCIAEo", 
-              "DjIiLmdvb2dsZS5wcm90b2J1Zi5GaWVsZC5DYXJkaW5hbGl0eRIOCgZudW1i", 
-              "ZXIYAyABKAUSDAoEbmFtZRgEIAEoCRIQCgh0eXBlX3VybBgGIAEoCRITCgtv", 
-              "bmVvZl9pbmRleBgHIAEoBRIOCgZwYWNrZWQYCCABKAgSKAoHb3B0aW9ucxgJ", 
-              "IAMoCzIXLmdvb2dsZS5wcm90b2J1Zi5PcHRpb24iuAIKBEtpbmQSEAoMVFlQ", 
-              "RV9VTktOT1dOEAASDwoLVFlQRV9ET1VCTEUQARIOCgpUWVBFX0ZMT0FUEAIS", 
-              "DgoKVFlQRV9JTlQ2NBADEg8KC1RZUEVfVUlOVDY0EAQSDgoKVFlQRV9JTlQz", 
-              "MhAFEhAKDFRZUEVfRklYRUQ2NBAGEhAKDFRZUEVfRklYRUQzMhAHEg0KCVRZ", 
-              "UEVfQk9PTBAIEg8KC1RZUEVfU1RSSU5HEAkSEAoMVFlQRV9NRVNTQUdFEAsS", 
-              "DgoKVFlQRV9CWVRFUxAMEg8KC1RZUEVfVUlOVDMyEA0SDQoJVFlQRV9FTlVN", 
-              "EA4SEQoNVFlQRV9TRklYRUQzMhAPEhEKDVRZUEVfU0ZJWEVENjQQEBIPCgtU", 
-              "WVBFX1NJTlQzMhAREg8KC1RZUEVfU0lOVDY0EBIidAoLQ2FyZGluYWxpdHkS", 
-              "FwoTQ0FSRElOQUxJVFlfVU5LTk9XThAAEhgKFENBUkRJTkFMSVRZX09QVElP", 
-              "TkFMEAESGAoUQ0FSRElOQUxJVFlfUkVRVUlSRUQQAhIYChRDQVJESU5BTElU", 
-              "WV9SRVBFQVRFRBADIqUBCgRFbnVtEgwKBG5hbWUYASABKAkSLQoJZW51bXZh", 
-              "bHVlGAIgAygLMhouZ29vZ2xlLnByb3RvYnVmLkVudW1WYWx1ZRIoCgdvcHRp", 
-              "b25zGAMgAygLMhcuZ29vZ2xlLnByb3RvYnVmLk9wdGlvbhI2Cg5zb3VyY2Vf", 
-              "Y29udGV4dBgEIAEoCzIeLmdvb2dsZS5wcm90b2J1Zi5Tb3VyY2VDb250ZXh0", 
-              "IlMKCUVudW1WYWx1ZRIMCgRuYW1lGAEgASgJEg4KBm51bWJlchgCIAEoBRIo", 
-              "CgdvcHRpb25zGAMgAygLMhcuZ29vZ2xlLnByb3RvYnVmLk9wdGlvbiI7CgZP", 
-              "cHRpb24SDAoEbmFtZRgBIAEoCRIjCgV2YWx1ZRgCIAEoCzIULmdvb2dsZS5w", 
-              "cm90b2J1Zi5BbnlCSQoTY29tLmdvb2dsZS5wcm90b2J1ZkIJVHlwZVByb3Rv", 
-              "UAGiAgNHUEKqAh5Hb29nbGUuUHJvdG9idWYuV2VsbEtub3duVHlwZXNiBnBy", 
-              "b3RvMw=="));
+              "Chpnb29nbGUvcHJvdG9idWYvdHlwZS5wcm90bxIPZ29vZ2xlLnByb3RvYnVm",
+              "Ghlnb29nbGUvcHJvdG9idWYvYW55LnByb3RvGiRnb29nbGUvcHJvdG9idWYv",
+              "c291cmNlX2NvbnRleHQucHJvdG8i1wEKBFR5cGUSDAoEbmFtZRgBIAEoCRIm",
+              "CgZmaWVsZHMYAiADKAsyFi5nb29nbGUucHJvdG9idWYuRmllbGQSDgoGb25l",
+              "b2ZzGAMgAygJEigKB29wdGlvbnMYBCADKAsyFy5nb29nbGUucHJvdG9idWYu",
+              "T3B0aW9uEjYKDnNvdXJjZV9jb250ZXh0GAUgASgLMh4uZ29vZ2xlLnByb3Rv",
+              "YnVmLlNvdXJjZUNvbnRleHQSJwoGc3ludGF4GAYgASgOMhcuZ29vZ2xlLnBy",
+              "b3RvYnVmLlN5bnRheCK+BQoFRmllbGQSKQoEa2luZBgBIAEoDjIbLmdvb2ds",
+              "ZS5wcm90b2J1Zi5GaWVsZC5LaW5kEjcKC2NhcmRpbmFsaXR5GAIgASgOMiIu",
+              "Z29vZ2xlLnByb3RvYnVmLkZpZWxkLkNhcmRpbmFsaXR5Eg4KBm51bWJlchgD",
+              "IAEoBRIMCgRuYW1lGAQgASgJEhAKCHR5cGVfdXJsGAYgASgJEhMKC29uZW9m",
+              "X2luZGV4GAcgASgFEg4KBnBhY2tlZBgIIAEoCBIoCgdvcHRpb25zGAkgAygL",
+              "MhcuZ29vZ2xlLnByb3RvYnVmLk9wdGlvbhIRCglqc29uX25hbWUYCiABKAki",
+              "yAIKBEtpbmQSEAoMVFlQRV9VTktOT1dOEAASDwoLVFlQRV9ET1VCTEUQARIO",
+              "CgpUWVBFX0ZMT0FUEAISDgoKVFlQRV9JTlQ2NBADEg8KC1RZUEVfVUlOVDY0",
+              "EAQSDgoKVFlQRV9JTlQzMhAFEhAKDFRZUEVfRklYRUQ2NBAGEhAKDFRZUEVf",
+              "RklYRUQzMhAHEg0KCVRZUEVfQk9PTBAIEg8KC1RZUEVfU1RSSU5HEAkSDgoK",
+              "VFlQRV9HUk9VUBAKEhAKDFRZUEVfTUVTU0FHRRALEg4KClRZUEVfQllURVMQ",
+              "DBIPCgtUWVBFX1VJTlQzMhANEg0KCVRZUEVfRU5VTRAOEhEKDVRZUEVfU0ZJ",
+              "WEVEMzIQDxIRCg1UWVBFX1NGSVhFRDY0EBASDwoLVFlQRV9TSU5UMzIQERIP",
+              "CgtUWVBFX1NJTlQ2NBASInQKC0NhcmRpbmFsaXR5EhcKE0NBUkRJTkFMSVRZ",
+              "X1VOS05PV04QABIYChRDQVJESU5BTElUWV9PUFRJT05BTBABEhgKFENBUkRJ",
+              "TkFMSVRZX1JFUVVJUkVEEAISGAoUQ0FSRElOQUxJVFlfUkVQRUFURUQQAyLO",
+              "AQoERW51bRIMCgRuYW1lGAEgASgJEi0KCWVudW12YWx1ZRgCIAMoCzIaLmdv",
+              "b2dsZS5wcm90b2J1Zi5FbnVtVmFsdWUSKAoHb3B0aW9ucxgDIAMoCzIXLmdv",
+              "b2dsZS5wcm90b2J1Zi5PcHRpb24SNgoOc291cmNlX2NvbnRleHQYBCABKAsy",
+              "Hi5nb29nbGUucHJvdG9idWYuU291cmNlQ29udGV4dBInCgZzeW50YXgYBSAB",
+              "KA4yFy5nb29nbGUucHJvdG9idWYuU3ludGF4IlMKCUVudW1WYWx1ZRIMCgRu",
+              "YW1lGAEgASgJEg4KBm51bWJlchgCIAEoBRIoCgdvcHRpb25zGAMgAygLMhcu",
+              "Z29vZ2xlLnByb3RvYnVmLk9wdGlvbiI7CgZPcHRpb24SDAoEbmFtZRgBIAEo",
+              "CRIjCgV2YWx1ZRgCIAEoCzIULmdvb2dsZS5wcm90b2J1Zi5BbnkqLgoGU3lu",
+              "dGF4EhEKDVNZTlRBWF9QUk9UTzIQABIRCg1TWU5UQVhfUFJPVE8zEAFCTAoT",
+              "Y29tLmdvb2dsZS5wcm90b2J1ZkIJVHlwZVByb3RvUAGgAQGiAgNHUEKqAh5H",
+              "b29nbGUuUHJvdG9idWYuV2VsbEtub3duVHlwZXNiBnByb3RvMw=="));
         descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
             new pbr::FileDescriptor[] { global::Google.Protobuf.WellKnownTypes.Proto.Any.Descriptor, global::Google.Protobuf.WellKnownTypes.Proto.SourceContext.Descriptor, },
-            new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
-              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Type), new[]{ "Name", "Fields", "Oneofs", "Options", "SourceContext" }, null, null, null),
-              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Field), new[]{ "Kind", "Cardinality", "Number", "Name", "TypeUrl", "OneofIndex", "Packed", "Options" }, null, new[]{ typeof(global::Google.Protobuf.WellKnownTypes.Field.Types.Kind), typeof(global::Google.Protobuf.WellKnownTypes.Field.Types.Cardinality) }, null),
-              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Enum), new[]{ "Name", "Enumvalue", "Options", "SourceContext" }, null, null, null),
+            new pbr::GeneratedCodeInfo(new[] {typeof(global::Google.Protobuf.WellKnownTypes.Syntax), }, new pbr::GeneratedCodeInfo[] {
+              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Type), new[]{ "Name", "Fields", "Oneofs", "Options", "SourceContext", "Syntax" }, null, null, null),
+              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Field), new[]{ "Kind", "Cardinality", "Number", "Name", "TypeUrl", "OneofIndex", "Packed", "Options", "JsonName" }, null, new[]{ typeof(global::Google.Protobuf.WellKnownTypes.Field.Types.Kind), typeof(global::Google.Protobuf.WellKnownTypes.Field.Types.Cardinality) }, null),
+              new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Enum), new[]{ "Name", "Enumvalue", "Options", "SourceContext", "Syntax" }, null, null, null),
               new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.EnumValue), new[]{ "Name", "Number", "Options" }, null, null, null),
               new pbr::GeneratedCodeInfo(typeof(global::Google.Protobuf.WellKnownTypes.Option), new[]{ "Name", "Value" }, null, null, null)
             }));
@@ -68,6 +71,14 @@ namespace Google.Protobuf.WellKnownTypes {
 
     }
   }
+  #region Enums
+  public enum Syntax {
+    SYNTAX_PROTO2 = 0,
+    SYNTAX_PROTO3 = 1,
+  }
+
+  #endregion
+
   #region Messages
   [global::System.Diagnostics.DebuggerNonUserCodeAttribute()]
   public sealed partial class Type : pb::IMessage<Type> {
@@ -94,6 +105,7 @@ namespace Google.Protobuf.WellKnownTypes {
       oneofs_ = other.oneofs_.Clone();
       options_ = other.options_.Clone();
       SourceContext = other.sourceContext_ != null ? other.SourceContext.Clone() : null;
+      syntax_ = other.syntax_;
     }
 
     public Type Clone() {
@@ -142,6 +154,15 @@ namespace Google.Protobuf.WellKnownTypes {
       }
     }
 
+    public const int SyntaxFieldNumber = 6;
+    private global::Google.Protobuf.WellKnownTypes.Syntax syntax_ = global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2;
+    public global::Google.Protobuf.WellKnownTypes.Syntax Syntax {
+      get { return syntax_; }
+      set {
+        syntax_ = value;
+      }
+    }
+
     public override bool Equals(object other) {
       return Equals(other as Type);
     }
@@ -158,6 +179,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if(!oneofs_.Equals(other.oneofs_)) return false;
       if(!options_.Equals(other.options_)) return false;
       if (!object.Equals(SourceContext, other.SourceContext)) return false;
+      if (Syntax != other.Syntax) return false;
       return true;
     }
 
@@ -168,6 +190,7 @@ namespace Google.Protobuf.WellKnownTypes {
       hash ^= oneofs_.GetHashCode();
       hash ^= options_.GetHashCode();
       if (sourceContext_ != null) hash ^= SourceContext.GetHashCode();
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) hash ^= Syntax.GetHashCode();
       return hash;
     }
 
@@ -187,6 +210,10 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(42);
         output.WriteMessage(SourceContext);
       }
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        output.WriteRawTag(48);
+        output.WriteEnum((int) Syntax);
+      }
     }
 
     public int CalculateSize() {
@@ -200,6 +227,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (sourceContext_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(SourceContext);
       }
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Syntax);
+      }
       return size;
     }
 
@@ -219,6 +249,9 @@ namespace Google.Protobuf.WellKnownTypes {
         }
         SourceContext.MergeFrom(other.SourceContext);
       }
+      if (other.Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        Syntax = other.Syntax;
+      }
     }
 
     public void MergeFrom(pb::CodedInputStream input) {
@@ -251,6 +284,10 @@ namespace Google.Protobuf.WellKnownTypes {
             input.ReadMessage(sourceContext_);
             break;
           }
+          case 48: {
+            syntax_ = (global::Google.Protobuf.WellKnownTypes.Syntax) input.ReadEnum();
+            break;
+          }
         }
       }
     }
@@ -285,6 +322,7 @@ namespace Google.Protobuf.WellKnownTypes {
       oneofIndex_ = other.oneofIndex_;
       packed_ = other.packed_;
       options_ = other.options_.Clone();
+      jsonName_ = other.jsonName_;
     }
 
     public Field Clone() {
@@ -362,6 +400,15 @@ namespace Google.Protobuf.WellKnownTypes {
       get { return options_; }
     }
 
+    public const int JsonNameFieldNumber = 10;
+    private string jsonName_ = "";
+    public string JsonName {
+      get { return jsonName_; }
+      set {
+        jsonName_ = pb::Preconditions.CheckNotNull(value, "value");
+      }
+    }
+
     public override bool Equals(object other) {
       return Equals(other as Field);
     }
@@ -381,6 +428,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (OneofIndex != other.OneofIndex) return false;
       if (Packed != other.Packed) return false;
       if(!options_.Equals(other.options_)) return false;
+      if (JsonName != other.JsonName) return false;
       return true;
     }
 
@@ -394,6 +442,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if (OneofIndex != 0) hash ^= OneofIndex.GetHashCode();
       if (Packed != false) hash ^= Packed.GetHashCode();
       hash ^= options_.GetHashCode();
+      if (JsonName.Length != 0) hash ^= JsonName.GetHashCode();
       return hash;
     }
 
@@ -431,6 +480,10 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteBool(Packed);
       }
       options_.WriteTo(output, _repeated_options_codec);
+      if (JsonName.Length != 0) {
+        output.WriteRawTag(82);
+        output.WriteString(JsonName);
+      }
     }
 
     public int CalculateSize() {
@@ -457,6 +510,9 @@ namespace Google.Protobuf.WellKnownTypes {
         size += 1 + 1;
       }
       size += options_.CalculateSize(_repeated_options_codec);
+      if (JsonName.Length != 0) {
+        size += 1 + pb::CodedOutputStream.ComputeStringSize(JsonName);
+      }
       return size;
     }
 
@@ -486,6 +542,9 @@ namespace Google.Protobuf.WellKnownTypes {
         Packed = other.Packed;
       }
       options_.Add(other.options_);
+      if (other.JsonName.Length != 0) {
+        JsonName = other.JsonName;
+      }
     }
 
     public void MergeFrom(pb::CodedInputStream input) {
@@ -527,6 +586,10 @@ namespace Google.Protobuf.WellKnownTypes {
             options_.AddEntriesFrom(input, _repeated_options_codec);
             break;
           }
+          case 82: {
+            JsonName = input.ReadString();
+            break;
+          }
         }
       }
     }
@@ -545,6 +608,7 @@ namespace Google.Protobuf.WellKnownTypes {
         TYPE_FIXED32 = 7,
         TYPE_BOOL = 8,
         TYPE_STRING = 9,
+        TYPE_GROUP = 10,
         TYPE_MESSAGE = 11,
         TYPE_BYTES = 12,
         TYPE_UINT32 = 13,
@@ -591,6 +655,7 @@ namespace Google.Protobuf.WellKnownTypes {
       enumvalue_ = other.enumvalue_.Clone();
       options_ = other.options_.Clone();
       SourceContext = other.sourceContext_ != null ? other.SourceContext.Clone() : null;
+      syntax_ = other.syntax_;
     }
 
     public Enum Clone() {
@@ -631,6 +696,15 @@ namespace Google.Protobuf.WellKnownTypes {
       }
     }
 
+    public const int SyntaxFieldNumber = 5;
+    private global::Google.Protobuf.WellKnownTypes.Syntax syntax_ = global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2;
+    public global::Google.Protobuf.WellKnownTypes.Syntax Syntax {
+      get { return syntax_; }
+      set {
+        syntax_ = value;
+      }
+    }
+
     public override bool Equals(object other) {
       return Equals(other as Enum);
     }
@@ -646,6 +720,7 @@ namespace Google.Protobuf.WellKnownTypes {
       if(!enumvalue_.Equals(other.enumvalue_)) return false;
       if(!options_.Equals(other.options_)) return false;
       if (!object.Equals(SourceContext, other.SourceContext)) return false;
+      if (Syntax != other.Syntax) return false;
       return true;
     }
 
@@ -655,6 +730,7 @@ namespace Google.Protobuf.WellKnownTypes {
       hash ^= enumvalue_.GetHashCode();
       hash ^= options_.GetHashCode();
       if (sourceContext_ != null) hash ^= SourceContext.GetHashCode();
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) hash ^= Syntax.GetHashCode();
       return hash;
     }
 
@@ -673,6 +749,10 @@ namespace Google.Protobuf.WellKnownTypes {
         output.WriteRawTag(34);
         output.WriteMessage(SourceContext);
       }
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        output.WriteRawTag(40);
+        output.WriteEnum((int) Syntax);
+      }
     }
 
     public int CalculateSize() {
@@ -685,6 +765,9 @@ namespace Google.Protobuf.WellKnownTypes {
       if (sourceContext_ != null) {
         size += 1 + pb::CodedOutputStream.ComputeMessageSize(SourceContext);
       }
+      if (Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        size += 1 + pb::CodedOutputStream.ComputeEnumSize((int) Syntax);
+      }
       return size;
     }
 
@@ -703,6 +786,9 @@ namespace Google.Protobuf.WellKnownTypes {
         }
         SourceContext.MergeFrom(other.SourceContext);
       }
+      if (other.Syntax != global::Google.Protobuf.WellKnownTypes.Syntax.SYNTAX_PROTO2) {
+        Syntax = other.Syntax;
+      }
     }
 
     public void MergeFrom(pb::CodedInputStream input) {
@@ -731,6 +817,10 @@ namespace Google.Protobuf.WellKnownTypes {
             input.ReadMessage(sourceContext_);
             break;
           }
+          case 40: {
+            syntax_ = (global::Google.Protobuf.WellKnownTypes.Syntax) input.ReadEnum();
+            break;
+          }
         }
       }
     }
diff --git a/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs b/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs
index 9ecaf47c..7e63d805 100644
--- a/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs
+++ b/csharp/src/Google.Protobuf/WellKnownTypes/Wrappers.cs
@@ -21,15 +21,15 @@ namespace Google.Protobuf.WellKnownTypes {
     static Wrappers() {
       byte[] descriptorData = global::System.Convert.FromBase64String(
           string.Concat(
-            "Ch5nb29nbGUvcHJvdG9idWYvd3JhcHBlcnMucHJvdG8SD2dvb2dsZS5wcm90", 
-            "b2J1ZiIcCgtEb3VibGVWYWx1ZRINCgV2YWx1ZRgBIAEoASIbCgpGbG9hdFZh", 
-            "bHVlEg0KBXZhbHVlGAEgASgCIhsKCkludDY0VmFsdWUSDQoFdmFsdWUYASAB", 
-            "KAMiHAoLVUludDY0VmFsdWUSDQoFdmFsdWUYASABKAQiGwoKSW50MzJWYWx1", 
-            "ZRINCgV2YWx1ZRgBIAEoBSIcCgtVSW50MzJWYWx1ZRINCgV2YWx1ZRgBIAEo", 
-            "DSIaCglCb29sVmFsdWUSDQoFdmFsdWUYASABKAgiHAoLU3RyaW5nVmFsdWUS", 
-            "DQoFdmFsdWUYASABKAkiGwoKQnl0ZXNWYWx1ZRINCgV2YWx1ZRgBIAEoDEJN", 
-            "ChNjb20uZ29vZ2xlLnByb3RvYnVmQg1XcmFwcGVyc1Byb3RvUAGiAgNHUEKq", 
-            "Ah5Hb29nbGUuUHJvdG9idWYuV2VsbEtub3duVHlwZXNiBnByb3RvMw=="));
+            "Ch5nb29nbGUvcHJvdG9idWYvd3JhcHBlcnMucHJvdG8SD2dvb2dsZS5wcm90",
+            "b2J1ZiIcCgtEb3VibGVWYWx1ZRINCgV2YWx1ZRgBIAEoASIbCgpGbG9hdFZh",
+            "bHVlEg0KBXZhbHVlGAEgASgCIhsKCkludDY0VmFsdWUSDQoFdmFsdWUYASAB",
+            "KAMiHAoLVUludDY0VmFsdWUSDQoFdmFsdWUYASABKAQiGwoKSW50MzJWYWx1",
+            "ZRINCgV2YWx1ZRgBIAEoBSIcCgtVSW50MzJWYWx1ZRINCgV2YWx1ZRgBIAEo",
+            "DSIaCglCb29sVmFsdWUSDQoFdmFsdWUYASABKAgiHAoLU3RyaW5nVmFsdWUS",
+            "DQoFdmFsdWUYASABKAkiGwoKQnl0ZXNWYWx1ZRINCgV2YWx1ZRgBIAEoDEJQ",
+            "ChNjb20uZ29vZ2xlLnByb3RvYnVmQg1XcmFwcGVyc1Byb3RvUAGgAQGiAgNH",
+            "UEKqAh5Hb29nbGUuUHJvdG9idWYuV2VsbEtub3duVHlwZXNiBnByb3RvMw=="));
       descriptor = pbr::FileDescriptor.InternalBuildGeneratedFileFrom(descriptorData,
           new pbr::FileDescriptor[] { },
           new pbr::GeneratedCodeInfo(null, new pbr::GeneratedCodeInfo[] {
diff --git a/src/google/protobuf/compiler/csharp/csharp_generator.cc b/src/google/protobuf/compiler/csharp/csharp_generator.cc
index e0a6c83a..95ff48ae 100644
--- a/src/google/protobuf/compiler/csharp/csharp_generator.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_generator.cc
@@ -36,10 +36,12 @@
 #include <google/protobuf/descriptor.pb.h>
 #include <google/protobuf/io/printer.h>
 #include <google/protobuf/io/zero_copy_stream.h>
+#include <google/protobuf/stubs/strutil.h>
 
 #include <google/protobuf/compiler/csharp/csharp_generator.h>
-#include <google/protobuf/compiler/csharp/csharp_umbrella_class.h>
 #include <google/protobuf/compiler/csharp/csharp_helpers.h>
+#include <google/protobuf/compiler/csharp/csharp_names.h>
+#include <google/protobuf/compiler/csharp/csharp_umbrella_class.h>
 
 using google::protobuf::internal::scoped_ptr;
 
@@ -48,9 +50,39 @@ namespace protobuf {
 namespace compiler {
 namespace csharp {
 
-std::string GetOutputFile(const google::protobuf::FileDescriptor* file, const std::string file_extension)
-{
-  return GetUmbrellaClassUnqualifiedName(file) + file_extension;
+std::string GetOutputFile(
+    const google::protobuf::FileDescriptor* file,
+    const std::string file_extension,
+    const bool generate_directories,
+    const std::string base_namespace,
+    string* error) {
+  string relative_filename = GetUmbrellaClassUnqualifiedName(file) + file_extension;
+  if (!generate_directories) {
+    return relative_filename;
+  }
+  string ns = GetFileNamespace(file);
+  string namespace_suffix = ns;
+  if (!base_namespace.empty()) {
+    // Check that the base_namespace is either equal to or a leading part of
+    // the file namespace. This isn't just a simple prefix; "Foo.B" shouldn't
+    // be regarded as a prefix of "Foo.Bar". The simplest option is to add "."
+    // to both.
+    string extended_ns = ns + ".";
+    if (extended_ns.find(base_namespace + ".") != 0) {
+      *error = "Namespace " + ns + " is not a prefix namespace of base namespace " + base_namespace;
+      return ""; // This will be ignored, because we've set an error.
+    }
+    namespace_suffix = ns.substr(base_namespace.length());
+    if (namespace_suffix.find(".") == 0) {
+      namespace_suffix = namespace_suffix.substr(1);
+    }
+  }
+
+  string namespace_dir = StringReplace(namespace_suffix, ".", "/", true);
+  if (!namespace_dir.empty()) {
+    namespace_dir += "/";
+  }
+  return namespace_dir + relative_filename;
 }
 
 void GenerateFile(const google::protobuf::FileDescriptor* file,
@@ -75,16 +107,26 @@ bool Generator::Generate(
   }
 
   std::string file_extension = ".cs";
+  std::string base_namespace = "";
+  bool generate_directories = false;
   for (int i = 0; i < options.size(); i++) {
     if (options[i].first == "file_extension") {
       file_extension = options[i].second;
+    } else if (options[i].first == "base_namespace") {
+      base_namespace = options[i].second;
+      generate_directories = true;
     } else {
       *error = "Unknown generator option: " + options[i].first;
       return false;
     }
   }
 
-  std::string filename = GetOutputFile(file, file_extension);
+  string filename_error = "";
+  std::string filename = GetOutputFile(file, file_extension, generate_directories, base_namespace, &filename_error);
+  if (!filename_error.empty()) {
+    *error = filename_error;
+    return false;
+  }
   scoped_ptr<io::ZeroCopyOutputStream> output(
       generator_context->Open(filename));
   io::Printer printer(output.get(), '$');
diff --git a/src/google/protobuf/compiler/csharp/csharp_helpers.h b/src/google/protobuf/compiler/csharp/csharp_helpers.h
index 4ed17a84..e293faca 100644
--- a/src/google/protobuf/compiler/csharp/csharp_helpers.h
+++ b/src/google/protobuf/compiler/csharp/csharp_helpers.h
@@ -101,8 +101,6 @@ std::string StringToBase64(const std::string& input);
 
 std::string FileDescriptorToBase64(const FileDescriptor* descriptor);
 
-uint FixedMakeTag(const FieldDescriptor* descriptor);
-
 FieldGeneratorBase* CreateFieldGenerator(const FieldDescriptor* descriptor, int fieldOrdinal);
 
 // Determines whether the given message is a map entry message, i.e. one implicitly created
diff --git a/src/google/protobuf/compiler/csharp/csharp_umbrella_class.cc b/src/google/protobuf/compiler/csharp/csharp_umbrella_class.cc
index 399c64e1..4b347708 100644
--- a/src/google/protobuf/compiler/csharp/csharp_umbrella_class.cc
+++ b/src/google/protobuf/compiler/csharp/csharp_umbrella_class.cc
@@ -166,7 +166,7 @@ void UmbrellaClassGenerator::WriteDescriptor(io::Printer* printer) {
   // TODO(jonskeet): Consider a C#-escaping format here instead of just Base64.
   std::string base64 = FileDescriptorToBase64(file_);
   while (base64.size() > 60) {
-    printer->Print("\"$base64$\", \n", "base64", base64.substr(0, 60));
+    printer->Print("\"$base64$\",\n", "base64", base64.substr(0, 60));
     base64 = base64.substr(60);
   }
   printer->Print("\"$base64$\"));\n", "base64", base64);
diff --git a/src/google/protobuf/compiler/main.cc b/src/google/protobuf/compiler/main.cc
index 4815a726..584e5a40 100644
--- a/src/google/protobuf/compiler/main.cc
+++ b/src/google/protobuf/compiler/main.cc
@@ -72,7 +72,7 @@ int main(int argc, char* argv[]) {
 
   // CSharp
   google::protobuf::compiler::csharp::Generator csharp_generator;
-  cli.RegisterGenerator("--csharp_out", &csharp_generator,
+  cli.RegisterGenerator("--csharp_out", "--csharp_opt", &csharp_generator,
                         "Generate C# source file.");
 
   // Objective C
diff --git a/src/google/protobuf/descriptor.pb.cc b/src/google/protobuf/descriptor.pb.cc
index fe23c0ab..44f34eeb 100644
--- a/src/google/protobuf/descriptor.pb.cc
+++ b/src/google/protobuf/descriptor.pb.cc
@@ -755,9 +755,9 @@ void protobuf_AddDesc_google_2fprotobuf_2fdescriptor_2eproto() {
     "tion\032\206\001\n\010Location\022\020\n\004path\030\001 \003(\005B\002\020\001\022\020\n\004s"
     "pan\030\002 \003(\005B\002\020\001\022\030\n\020leading_comments\030\003 \001(\t\022"
     "\031\n\021trailing_comments\030\004 \001(\t\022!\n\031leading_de"
-    "tached_comments\030\006 \003(\tB;\n\023com.google.prot"
+    "tached_comments\030\006 \003(\tBX\n\023com.google.prot"
     "obufB\020DescriptorProtosH\001Z\ndescriptor\242\002\003G"
-    "PB", 4962);
+    "PB\252\002\032Google.Protobuf.Reflection", 4991);
   ::google::protobuf::MessageFactory::InternalRegisterGeneratedFile(
     "google/protobuf/descriptor.proto", &protobuf_RegisterTypes);
   FileDescriptorSet::default_instance_ = new FileDescriptorSet();
diff --git a/src/google/protobuf/descriptor.proto b/src/google/protobuf/descriptor.proto
index 8f90a956..bd02ed9b 100644
--- a/src/google/protobuf/descriptor.proto
+++ b/src/google/protobuf/descriptor.proto
@@ -43,8 +43,7 @@ package google.protobuf;
 option go_package = "descriptor";
 option java_package = "com.google.protobuf";
 option java_outer_classname = "DescriptorProtos";
-// Re-enable this once the tools have picked up the csharp_namespace option.
-// option csharp_namespace = "Google.ProtocolBuffers.DescriptorProtos";
+option csharp_namespace = "Google.Protobuf.Reflection";
 option objc_class_prefix = "GPB";
 
 // descriptor.proto must be optimized for speed because reflection-based