srcX, err := src.UnmarshalNew()
	if err != nil {
		return nil, err
	}

	// Merge the two typed protos
	merge.Merge(dstX, srcX)

	// Convert the merged proto back to dst
	retVal := protoconv.MessageToAny(dstX)

	return retVal, nil
}

// AppendLbEndpointMetadata adds metadata values to a lb endpoint using the passed in metadata as base.

  OpBuilder builder(op);
  builder.setInsertionPointAfter(op);
  for (auto retval :
       llvm::enumerate(func.front().getTerminator()->getOperands())) {
    if (propagate_caller_callee_constants_) {
      auto retval_op = retval.value().getDefiningOp();
      if (isa_and_nonnull<TF::ConstOp>(retval_op)) {
        op->getResult(retval.index())
            .replaceAllUsesWith(builder.clone(*retval_op)->getResult(0));
      }