/*
 * Copyright (c) 2019, 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.
 */
/**
 * @assertion An expression of the form e! evaluates e to a value v, throws a
 * runtime error if v is null, and otherwise evaluates to v.
 *
 * @description Check that an expression of the form e! evaluates e to a value
 * v, throws no runtime error if v is not null. Test (true)
 * @author sgrekhov@unipro.ru
 * @issue 39723
 */

main() {
  true!;
//^
// [cfe] Operand of null-aware operation '!' has type 'bool' which excludes null.
//    ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
  true!.toString();
//^
// [cfe] Operand of null-aware operation '!' has type 'bool' which excludes null.
//    ^
// [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
  true!?.toString();
// [error line 27, column 0]
// [analyzer] unspecified
// [cfe] unspecified
  true.toString()!;
  //   ^
  // [cfe] Operand of null-aware operation '!' has type 'String' which excludes null.
  //             ^
  // [analyzer] STATIC_WARNING.UNNECESSARY_NON_NULL_ASSERTION
}