pkg/front_end/testcases/patterns/null_literal_inside_null_check.dart

// Copyright (c) 2022, 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.

test(dynamic x) {
  switch (x) {
    case null?:
      break;
  }
}