<< " to be 'tf.ReadVariableOp' or 'tf.AssignVariableOp', got ["
           << llvm::join(composite_ops.begin(), composite_ops.end(), ", ")
           << "]";

  return success();
}

bool VariableIsInitialized(TF::VarHandleOp var_handle_op) {
  auto is_variable_initialized =
      var_handle_op->getAttrOfType<BoolAttr>("_is_initialized");
  // Assume variable is initialized if attribute is not set.