Robert Nystrom
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>
74 lines
1.9 KiB
Dart
74 lines
1.9 KiB
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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static Object returnValue;
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static Object argument;
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Object operator +(Object x) {
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argument = x;
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return returnValue;
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}
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}
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void main() {
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B origB = new B();
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B b = origB;
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B.returnValue = new B();
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B.argument = null;
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Expect.identical(B.returnValue, b += 2); // No error - types compatible
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Expect.identical(B.returnValue, b);
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Expect.identical(2, B.argument);
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b = origB;
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B.returnValue = new A();
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B.argument = null;
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Expect.throwsTypeError(() {
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b += 3;
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});
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// The exception should have happened after the call to operator+ but before
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// the assignment to b.
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Expect.identical(origB, b);
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Expect.identical(3, B.argument);
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b = origB;
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B.returnValue = new B();
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B.argument = null;
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Expect.identical(B.returnValue, ++b); // No error - types compatible
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Expect.identical(B.returnValue, b);
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Expect.identical(1, B.argument);
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b = origB;
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B.returnValue = new A();
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B.argument = null;
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Expect.throwsTypeError(() {
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++b;
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});
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// The exception should have happened after the call to operator+ but before
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// the assignment to b.
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Expect.identical(origB, b);
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Expect.identical(1, B.argument);
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b = origB;
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B.returnValue = new B();
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B.argument = null;
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Expect.identical(origB, b++); // No error - types compatible
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Expect.identical(B.returnValue, b);
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Expect.identical(1, B.argument);
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b = origB;
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B.returnValue = new A();
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B.argument = null;
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Expect.throwsTypeError(() {
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b++;
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});
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// The exception should have happened after the call to operator+ but before
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// the assignment to b.
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Expect.identical(origB, b);
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Expect.identical(1, B.argument);
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}
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