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2744918dc6
Change-Id: I6c3261311b5112d478525df1f06e40f04c129e03 Reviewed-on: https://dart-review.googlesource.com/25760 Reviewed-by: Samir Jindel <sjindel@google.com> Commit-Queue: Paul Berry <paulberry@google.com>
58 lines
1.1 KiB
Dart
58 lines
1.1 KiB
Dart
// Copyright (c) 2017, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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import "package:expect/expect.dart";
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class A {}
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class B extends A {}
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class C {
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void f(B x, B y) {}
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}
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abstract class I1 {
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void f(covariant A x, B y);
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}
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// D contains a forwarding stub for f which ensures that `x` is type checked.
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class D extends C implements I1 {}
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abstract class I2 {
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void f(B x, covariant A y);
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}
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// E contains a forwarding stub for f which ensures that `y` is type checked.
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class E extends D implements I2 {}
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main() {
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E e = new E();
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C c = e;
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I1 i1 = e;
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D d = e;
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I2 i2 = e;
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A a = new A();
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B b = new B();
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c.f(b, b); // No error
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i1.f(b, b); // No error
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d.f(b, b); // No error
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i2.f(b, b); // No error
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e.f(b, b); // No error
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Expect.throwsTypeError(() {
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i1.f(a, b);
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});
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Expect.throwsTypeError(() {
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d.f(a, b);
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});
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Expect.throwsTypeError(() {
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i2.f(b, a);
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});
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Expect.throwsTypeError(() {
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e.f(a, b);
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});
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Expect.throwsTypeError(() {
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e.f(b, a);
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});
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}
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