blob: d97fa3dca93f91928bff718aa67ac7f7e712a6b1 [file] [log] [blame]
// Copyright (c) 2017, 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 = 2.9
import "package:expect/expect.dart";
class A {}
class B extends A {}
class C {
void f(B x, B y) {}
}
abstract class I1<T> {
void f(T x, B y);
}
// D contains a forwarding stub for f which ensures that `x` is type checked.
class D extends C implements I1<B> {}
abstract class I2<T> {
void f(B x, T y);
}
// E contains a forwarding stub for f which ensures that `y` is type checked.
class E extends D implements I2<B> {}
main() {
E e = new E();
C c = e;
I1<A> i1 = e;
D d = e;
I2<A> i2 = e;
A a = new A();
B b = new B();
c.f(b, b); // No error
i1.f(b, b); // No error
d.f(b, b); // No error
i2.f(b, b); // No error
e.f(b, b); // No error
Expect.throwsTypeError(() {
i1.f(a, b);
});
Expect.throwsTypeError(() {
d.f(a, b);
});
Expect.throwsTypeError(() {
i2.f(b, a);
});
Expect.throwsTypeError(() {
e.f(a, b);
});
Expect.throwsTypeError(() {
e.f(b, a);
});
}