pkg/front_end/testcases/late_lowering/issue41436c/issue41436c_lib.dart

// Copyright (c) 2020, 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.

abstract class A {
  late int x;
}

class B implements A {
  int x = 3;
}