pkg/front_end/testcases/nnbd/null_check_context.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 {
  T bar<T>();
  String foo() => bar()!;
}

main() {}