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05ca544f15
Change-Id: Iaa0ca2b4f2d1b15f79ddca37834d3ed2497bc068 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/149242 Commit-Queue: Joshua Litt <joshualitt@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
59 lines
1.1 KiB
Dart
59 lines
1.1 KiB
Dart
// Copyright (c) 2015, 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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// @dart = 2.7
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import "package:expect/expect.dart";
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@pragma('dart2js:noInline')
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@pragma('dart2js:assumeDynamic')
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confuse(x) => x;
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main(args) {
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dynamic x = new A();
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var y;
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// Checks that inference doesn't incorrectly treat this as a normal
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// assignment (where only B is a possible value after the assignment).
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dynamic c = x ??= new B();
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var z = x;
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Expect.equals('a', x.m());
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Expect.equals('a', z.m());
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Expect.equals('a', c.m());
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if (confuse(true)) y = x;
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Expect.equals('a', y.m());
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// Similar test, within fields.
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new C();
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new D();
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}
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class A {
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m() => 'a';
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}
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class B {
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m() => 'b';
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}
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class C {
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var y;
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C() {
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y = new A();
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var c = y ??= new B();
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Expect.equals('a', y.m());
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Expect.equals('a', c.m());
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}
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}
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class D {
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var y;
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D() {
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this.y = new A();
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var c = this.y ??= new B();
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Expect.equals('a', y.m());
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Expect.equals('a', c.m());
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}
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}
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