mlir::LogicalResult ValidateVarHandle(TF::VarHandleOp var_handle_op) {
  auto composite_ops = GetCompositeResourceUserNames(var_handle_op);
  if (!composite_ops.empty())
    return var_handle_op.emitOpError()
           << "expects users to be 'tf.ReadVariableOp' or "
              "'tf.AssignVariableOp', got ["
           << llvm::join(composite_ops.begin(), composite_ops.end(), ", ")
           << "]";

  return success();
}