pkg/front_end/testcases/extension_types/extension_on_nullable.dart

// Copyright (c) 2021, 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.

class A {}

extension E on A? {
  void foo() {}
}

bar(E e) => e.foo();

main() {}