tests/language_2/function_subtype/bound_closure4_test.dart

// Copyright (c) 2013, 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.
// Dart test program for constructors and initializers.

// @dart = 2.9

// Check function subtyping for generic bound closures.

import 'package:expect/expect.dart';

typedef void Foo(bool a, [String b]);
typedef void Bar(bool a, [String b]);
typedef void Baz(bool a, {String b});
typedef int Boz(bool a);

class C<T> {
  void foo(T a, [String b]) {}
  void baz(T a, {String b}) {}

  void test(String nameOfT) {
    Expect.isTrue(foo is Foo, 'C<$nameOfT>.foo is not Foo');
    Expect.isTrue(foo is Bar, 'C<$nameOfT>.foo is not Bar');
    Expect.isFalse(foo is Baz, 'C<$nameOfT>.foo is Baz');
    Expect.isFalse(foo is Boz, 'C<$nameOfT>.foo is Boz');

    Expect.isFalse(baz is Foo, 'C<$nameOfT>.baz is Foo');
    Expect.isFalse(baz is Bar, 'C<$nameOfT>.baz is Bar');
    Expect.isTrue(baz is Baz, 'C<$nameOfT>.baz is not Baz');
    Expect.isFalse(baz is Boz, 'C<$nameOfT>.baz is Boz');
  }
}

class D<S, T> extends C<T> {}

main() {
  new D<String, bool>().test('bool');
  new D<bool, int>().test('int');
  new D<dynamic, dynamic>().test('dynamic');
}