Canged CodedInputStream.ReadTag to use boolean result with out params to
support reading a field name rather than a field tag.
diff --git a/src/ProtocolBuffers.Test/TestProtos/UnitTestRpcInterop.cs b/src/ProtocolBuffers.Test/TestProtos/UnitTestRpcInterop.cs
index 08ac8a6..3e9c35c 100644
--- a/src/ProtocolBuffers.Test/TestProtos/UnitTestRpcInterop.cs
+++ b/src/ProtocolBuffers.Test/TestProtos/UnitTestRpcInterop.cs
@@ -252,14 +252,12 @@
       

       public override Builder MergeFrom(pb::CodedInputStream input, pb::ExtensionRegistry extensionRegistry) {

         pb::UnknownFieldSet.Builder unknownFields = null;

-        while (true) {

-          uint tag = input.ReadTag();

+        uint tag;

+        string field_name;

+        while (input.ReadTag(out tag, out field_name)) {

           switch (tag) {

             case 0: {

-              if (unknownFields != null) {

-                this.UnknownFields = unknownFields.Build();

-              }

-              return this;

+              throw InvalidProtocolBufferException.InvalidTag();

             }

             default: {

               if (pb::WireFormat.IsEndGroupTag(tag)) {

@@ -280,6 +278,11 @@
             }

           }

         }

+        

+        if (unknownFields != null) {

+          this.UnknownFields = unknownFields.Build();

+        }

+        return this;

       }

       

       

@@ -533,14 +536,12 @@
           

           public override Builder MergeFrom(pb::CodedInputStream input, pb::ExtensionRegistry extensionRegistry) {

             pb::UnknownFieldSet.Builder unknownFields = null;

-            while (true) {

-              uint tag = input.ReadTag();

+            uint tag;

+            string field_name;

+            while (input.ReadTag(out tag, out field_name)) {

               switch (tag) {

                 case 0: {

-                  if (unknownFields != null) {

-                    this.UnknownFields = unknownFields.Build();

-                  }

-                  return this;

+                  throw InvalidProtocolBufferException.InvalidTag();

                 }

                 default: {

                   if (pb::WireFormat.IsEndGroupTag(tag)) {

@@ -565,6 +566,11 @@
                 }

               }

             }

+            

+            if (unknownFields != null) {

+              this.UnknownFields = unknownFields.Build();

+            }

+            return this;

           }

           

           

@@ -762,14 +768,12 @@
       

       public override Builder MergeFrom(pb::CodedInputStream input, pb::ExtensionRegistry extensionRegistry) {

         pb::UnknownFieldSet.Builder unknownFields = null;

-        while (true) {

-          uint tag = input.ReadTag();

+        uint tag;

+        string field_name;

+        while (input.ReadTag(out tag, out field_name)) {

           switch (tag) {

             case 0: {

-              if (unknownFields != null) {

-                this.UnknownFields = unknownFields.Build();

-              }

-              return this;

+              throw InvalidProtocolBufferException.InvalidTag();

             }

             default: {

               if (pb::WireFormat.IsEndGroupTag(tag)) {

@@ -792,6 +796,11 @@
             }

           }

         }

+        

+        if (unknownFields != null) {

+          this.UnknownFields = unknownFields.Build();

+        }

+        return this;

       }

       

       

@@ -1034,14 +1043,12 @@
       

       public override Builder MergeFrom(pb::CodedInputStream input, pb::ExtensionRegistry extensionRegistry) {

         pb::UnknownFieldSet.Builder unknownFields = null;

-        while (true) {

-          uint tag = input.ReadTag();

+        uint tag;

+        string field_name;

+        while (input.ReadTag(out tag, out field_name)) {

           switch (tag) {

             case 0: {

-              if (unknownFields != null) {

-                this.UnknownFields = unknownFields.Build();

-              }

-              return this;

+              throw InvalidProtocolBufferException.InvalidTag();

             }

             default: {

               if (pb::WireFormat.IsEndGroupTag(tag)) {

@@ -1071,6 +1078,11 @@
             }

           }

         }

+        

+        if (unknownFields != null) {

+          this.UnknownFields = unknownFields.Build();

+        }

+        return this;

       }