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b101a7d002
Change-Id: Ib33169c3e0ffc870915c189404074a1dea472546 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/196548 Reviewed-by: Bob Nystrom <rnystrom@google.com> Commit-Queue: Leaf Petersen <leafp@google.com>
68 lines
1.4 KiB
Dart
68 lines
1.4 KiB
Dart
// TODO(multitest): This was automatically migrated from a multitest and may
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// contain strange or dead code.
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// @dart = 2.9
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// 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<X> {
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void f(X 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<B>, while still ensuring that the x argument is type checked
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// before 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<B> {}
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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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// TODO: Downcast from I0 to B will be a compile-time error with NNBD.
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super.f(i0);
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// not ok since B2 is not assignable to B
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var superF = super.f; // Inferred static type: void Function(B)
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// ok since I0 is assignable to B
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// TODO: Downcast from I0 to B will be a compile-time error with NNBD.
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// not ok since B2 is not assignable to B
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// Should pass since superF's runtime type is void Function(Object)
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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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