return WalkResult::interrupt();
        }
        int called_index = called_index_attr.getInt();
        if (called_index < 0 || called_index >= function_list.size()) {
          op->emitOpError()
              << "references function #" << called_index
              << " but enclosing XlaCallModule has a function list of size "
              << function_list.size();

// i64 attribute `called_index` to the TF function's name.
constexpr llvm::StringRef kTfBackendConfigAttrName = "tf.backend_config";
constexpr llvm::StringRef kCalledIndexAttrName = "called_index";
constexpr llvm::StringRef kCalledFuncAttrName = "called_func";

// Converts `called_func` attributes in custom call ops back to `called_index`.
FailureOr<ArrayAttr> DesymbolizeCustomCallCalledIndex(ModuleOp module) {

    // CHECK:     return %[[RESULT]]
    func.return %0 : tensor<10xi32>
  }

  // CHECK-LABEL: func @foo