blob: f43e9e806965970c8d27457cf061a8ced984ae7d [file] [log] [blame]
// TODO(multitest): This was automatically migrated from a multitest and may
// contain strange or dead code.
// Copyright (c) 2018, 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.
import "package:expect/expect.dart";
class I0 {}
class A {}
class B extends A implements I0 {}
class B2 extends A {}
class C {
void f(B? x) {}
abstract class I<X> {
void f(X? x);
// This class contains a forwarding stub for f to allow it to satisfy the
// interface I<B>, while still ensuring that the x argument is type checked
// before C.f is executed.
// Super calls in a derived class resolve directly to C.f, and are type checked
// accordingly at compile time.
class D extends C implements I<B> {}
class E extends D {
void test() {
I0? i0 = null;
B2? b2 = null;
// ok since I0 is assignable to B
super.f(i0 as B?);
// not ok since B2 is not assignable to B
var superF = super.f; // Inferred static type: void Function(B)
// ok since I0 is assignable to B
// not ok since B2 is not assignable to B
// Should pass since superF's runtime type is void Function(Object)
main() {
new E().test();