pkg/front_end/testcases/enhanced_enums/external_constructor.dart

// Copyright (c) 2025, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

enum E {
  a(1);

  final int x;
  external const E(this.x);
}