public Builder mergeFrom(com.google.protobuf.Message other) {
        if (other instanceof com.google.protobuf.DescriptorProtos.SourceCodeInfo) {
          return mergeFrom((com.google.protobuf.DescriptorProtos.SourceCodeInfo)other);
        } else {
          super.mergeFrom(other);
          return this;
        }
      }