1 files changed, 9 insertions, 6 deletions
diff --git a/src/ProtocolBuffers.Test/TestProtos/UnitTestNoGenericServicesProtoFile.cs b/src/ProtocolBuffers.Test/TestProtos/UnitTestNoGenericServicesProtoFile.cs
index 423c3adc..994d5308 100644
--- a/src/ProtocolBuffers.Test/TestProtos/UnitTestNoGenericServicesProtoFile.cs
+++ b/src/ProtocolBuffers.Test/TestProtos/UnitTestNoGenericServicesProtoFile.cs
@@ -247,14 +247,12 @@ namespace Google.ProtocolBuffers.TestProtos.NoGenericService {
       
       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)) {
@@ -275,6 +273,11 @@ namespace Google.ProtocolBuffers.TestProtos.NoGenericService {
             }
           }
         }
+        
+        if (unknownFields != null) {
+          this.UnknownFields = unknownFields.Build();
+        }
+        return this;
       }