Regenerated code. Most changes are whitespace, removing trailing spaces.

Other changes are due to the well-known types changing without us regenerating.

10 files changed, 388 insertions, 96 deletions

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[] {