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// Copyright (c) 2016, 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 = 2.7
/// Regression test for --fast-startup. The compiler used to emit inherit calls
/// on each fragment even for classes that were already loaded on a different
/// fragment. As a result, the inheritance chain was overwritten in non-chrome
/// browsers (by using __proto__, we evaded this issue in Chrome).
library deferred_inheritance_test;
import 'deferred_inheritance_lib2.dart';
import 'deferred_inheritance_lib1.dart' deferred as d;
import 'package:expect/expect.dart';
class B extends A {}
/// If the check `y is A` is generated as `y.$isA` then the issue is not
/// exposed. We use `assumeDynamic` to ensure that we generate as `y instanceof
/// A` in JS.
@pragma('dart2js:noInline')
@pragma('dart2js:assumeDynamic')
check(y) => Expect.isTrue(y is A);
main() {
check(new B());
d.loadLibrary().then((_) {
check(new d.C());
check(new B()); // This fails if we overwrite the inheritance chain.
});
}