blob: aba62affbc44bbdf131c95ef03292291710ffd4a [file] [log] [blame]
// 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 A class declaration, type alias, or function [G] may be generic,
/// that is, [G] may have formal type parameters declared.
/// @description @description Checks various correct type alias declarations.
/// @author
// SharedOptions=--enable-experiment=nonfunction-type-aliases
import "../../Utils/expect.dart";
class B<T1, T2> {
B(this.x, this.y) {}
T1 x;
T2 y;
typedef BAlias<T1, T2 extends T1> = B<T1, T2>;
main() {
BAlias b1 = new B(1, 2);
Expect.isTrue(b1 is B<dynamic, dynamic>);
Expect.isTrue(b1 is BAlias);
Expect.isTrue(b1 is BAlias<dynamic, dynamic>);
BAlias<num, int> b2 = new B<num, int>(0, 149);
Expect.isTrue(b2 is B<num, int>);
Expect.isTrue(b2 is BAlias<num, int>);
Expect.equals(0, b2.x);
Expect.equals(149, b2.y);
BAlias<num, int> b3 = new B<int, int>(0, 149);
Expect.isTrue(b3 is B<int, int>);
Expect.isTrue(b3 is BAlias<int, int>);
Expect.equals(0, b3.x);
Expect.equals(149, b3.y);