blob: 04e917cf5b173795a5e1e8a165afdcdd38207f0d [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 {}
void main() {
B b;
A a1 = new B();
A a2 = new A();
b ??= a1; // No error - types compatible
b ??= a2; // No error - assignment has no effect
b = null;
Expect.throwsTypeError(() {
b ??= a2;
});
}