blob: 018d592b0ead74ed646e5a5930a10015203c5c87 [file] [log] [blame]
// Copyright (c) 2016, 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.
// Check function subtyping of type arguments. These cases use typedefs as type
// arguments, and the typedefs have type parameters that are used more than
// once.
import 'package:expect/expect.dart';
typedef A F<A>(A arg1, A arg2);
typedef B G<A, B>(B arg1, B arg2);
typedef Set<A> FS<A>(Set<A> arg1, Set<A> arg2);
dyn(x) => x;
class CheckEnv<X, Y> {
test(bool intX) {
Expect.isTrue(<F<X>>[] is! List<F>);
Expect.isTrue(<F<X>>[] is List<F<X>>);
Expect.isTrue(<F<X>>[] is List<G<Y, X>>);
Expect.isTrue(dyn(<F<X>>[]) is! List<F>);
Expect.isTrue(dyn(<F<X>>[]) is List<F<X>>);
Expect.isTrue(dyn(<F<X>>[]) is List<G<Y, X>>);
Expect.isFalse(<F<X>>[] is List<F<Y>>);
Expect.isFalse(<F<X>>[] is List<G<X, Y>>);
Expect.isFalse(dyn(<F<X>>[]) is List<F<Y>>);
Expect.isFalse(dyn(<F<X>>[]) is List<G<X, Y>>);
Expect.isFalse(dyn(<FS<X>>[]) is List<FS>);
Expect.isFalse(dyn(<FS<X>>[]) is List<FS<Null>>);
Expect.isTrue(dyn(<FS<X>>[]) is List<FS<X>>);
if (intX) {
Expect.isTrue(dyn(<FS<X>>[]) is List<FS<int>>);
Expect.isTrue(dyn(<FS<int>>[]) is List<FS<X>>);
Expect.isFalse(dyn(<FS<Y>>[]) is List<FS<int>>);
Expect.isFalse(dyn(<FS<int>>[]) is List<FS<Y>>);
main() {
Expect.isTrue(<F<int>>[] is List<F<int>>);
Expect.isTrue(dyn(<F<int>>[]) is List<F<int>>);
Expect.isTrue(<F<int>>[] is List<G<bool, int>>);
Expect.isTrue(dyn(<F<int>>[]) is List<G<bool, int>>);
new CheckEnv<int, String>().test(true);
new CheckEnv<String, int>().test(false);