mirror of
https://github.com/dart-lang/sdk
synced 2024-09-16 04:27:17 +00:00
912005267d
Change-Id: I46be49b2effec3e38a3dc44cd45cfe736f77fa78 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/182680 Commit-Queue: Sigmund Cherem <sigmund@google.com> Reviewed-by: Joshua Litt <joshualitt@google.com> Reviewed-by: Nicholas Shahan <nshahan@google.com> Reviewed-by: Stephen Adams <sra@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
|
|
// 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
|
|
|
|
import "package:expect/expect.dart";
|
|
|
|
@pragma('dart2js:noInline')
|
|
@pragma('dart2js:assumeDynamic')
|
|
confuse(x) => x;
|
|
|
|
main(args) {
|
|
dynamic x = new A();
|
|
var y;
|
|
|
|
// Checks that inference doesn't incorrectly treat this as a normal
|
|
// assignment (where only B is a possible value after the assignment).
|
|
dynamic c = x ??= new B();
|
|
var z = x;
|
|
Expect.equals('a', x.m());
|
|
Expect.equals('a', z.m());
|
|
Expect.equals('a', c.m());
|
|
if (confuse(true)) y = x;
|
|
Expect.equals('a', y.m());
|
|
|
|
// Similar test, within fields.
|
|
new C();
|
|
new D();
|
|
}
|
|
|
|
class A {
|
|
m() => 'a';
|
|
}
|
|
|
|
class B {
|
|
m() => 'b';
|
|
}
|
|
|
|
class C {
|
|
var y;
|
|
C() {
|
|
y = new A();
|
|
var c = y ??= new B();
|
|
Expect.equals('a', y.m());
|
|
Expect.equals('a', c.m());
|
|
}
|
|
}
|
|
|
|
class D {
|
|
var y;
|
|
D() {
|
|
this.y = new A();
|
|
var c = this.y ??= new B();
|
|
Expect.equals('a', y.m());
|
|
Expect.equals('a', c.m());
|
|
}
|
|
}
|