public Builder setField(
          int index, com.google.protobuf.DescriptorProtos.FieldDescriptorProto.Builder builderForValue) {
        if (fieldBuilder_ == null) {
          ensureFieldIsMutable();
          field_.set(index, builderForValue.build());
          onChanged();
        } else {
          fieldBuilder_.setMessage(index, builderForValue.build());
        }
        return this;
      }