blob: 7f3301320eb50e4ed3b73ce313afbaba5f131112 [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 Checks various correct type alias declarations.
/// @author
// SharedOptions=--enable-experiment=nonfunction-type-aliases
import "../../Utils/expect.dart";
class A<T> {}
class B<T1, T2> {
B(T1 x, T2 y) {
this.x = x;
this.y = y;
T1? x;
T2? y;
typedef BAlias<T> = B<T, T>;
main() {
BAlias b1 = B(1, 2);
Expect.isTrue(b1 is B);
Expect.isTrue(b1 is BAlias);
Expect.equals(1, b1.x);
Expect.equals(2, b1.y);
BAlias<int> b2 = new B<int, int>(0, 100);
Expect.isTrue(b2 is B<int, int>);
Expect.isTrue(b2 is BAlias<int>);
Expect.equals(0, b2.x);
Expect.equals(100, b2.y);
var a = new A<int?>();
BAlias<A<int?>?> b3 = new B<A<int?>?, A<int?>?>(a, null);
Expect.isTrue(b3 is B<A<int?>?, A<int?>?>);
Expect.isTrue(b3 is BAlias<A<int?>?>);
Expect.equals(a, b3.x);