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fc1b1ecc71
Change-Id: Idbcc965a27e9ffeedf5e0a1068b019de4193070f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/127745 Commit-Queue: Bob Nystrom <rnystrom@google.com> Reviewed-by: Alexander Thomas <athom@google.com>
22 lines
504 B
Dart
22 lines
504 B
Dart
// Copyright (c) 2017, 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 A {}
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class B extends A {}
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void main() {
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B b;
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A a1 = new B();
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A a2 = new A();
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b ??= a1; // No error - types compatible
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b ??= a2; // No error - assignment has no effect
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b = null;
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Expect.throwsTypeError(() {
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b ??= a2;
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});
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}
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