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236ea5bb44
Change-Id: Ib67f8ae239b89bf56efc059054b6430e27a0e66f Reviewed-on: https://dart-review.googlesource.com/34922 Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Erik Ernst <eernst@google.com>
61 lines
1.5 KiB
Dart
61 lines
1.5 KiB
Dart
// Copyright (c) 2018, 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 I0 {}
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class A {}
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class B extends A implements I0 {}
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class B2 extends A {}
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class C {
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void f(B x) {}
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}
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abstract class I {
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void f(covariant A x);
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}
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// This class contains a forwarding stub for f to allow it to satisfy the
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// interface I, while still ensuring that the x argument is type checked before
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// C.f is executed.
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//
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// Super calls in a derived class resolve directly to C.f, and are type checked
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// accordingly at compile time.
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class D extends C implements I {}
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class E extends D {
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void test() {
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I0 i0 = null;
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B2 b2 = null;
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// ok since I0 is assignable to B
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super.f(i0); //# 01: ok
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// not ok since B2 is not assignable to B
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super.f(b2); //# 02: compile-time error
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var superF = super.f; // Inferred type: (B) -> void
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// ok since I0 is assignable to B
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superF(i0); //# 03: ok
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// not ok since B2 is not assignable to B
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superF(b2); //# 04: compile-time error
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// Should pass since superF's runtime type is (B) -> void
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Expect.isTrue(superF is void Function(B)); //# 05: ok
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Expect.isTrue(superF is! void Function(I0)); //# 05: continued
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Expect.isTrue(superF is! void Function(A)); //# 05: continued
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Expect.isTrue(superF is! void Function(Object)); //# 05: continued
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}
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}
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main() {
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new E().test();
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}
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