Johnni Winther
08b776ac47
Change-Id: Ie380dda35cbf449669eb06d18cef284915dc748e Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/239305 Reviewed-by: Jens Johansen <jensj@google.com> Commit-Queue: Johnni Winther <johnniwinther@google.com>
75 lines
1.7 KiB
Dart
75 lines
1.7 KiB
Dart
// Copyright (c) 2019, 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=2.9
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class Class {
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int field;
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}
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extension Extension on Class {
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int get property => field;
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void set property(int value) {
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field = value;
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}
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int method() => field;
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testImplicitThis() {
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expect(null, property);
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expect(42, property ??= 42);
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expect(42, property ??= 87);
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}
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}
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main() {
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Class c;
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expect(null, c?.property);
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expect(null, c?.method);
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expect(null, c?.method());
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expect(null, c?.property = 42);
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expect(null, Extension(c)?.property ??= 42);
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c = new Class();
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expect(null, c?.property);
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expect(null, c?.method());
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var tearOff = c?.method;
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expect(null, tearOff());
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expect(42, c?.property = 42);
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expect(42, tearOff());
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expect(null, c?.property = null);
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expect(42, c?.property = 42);
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c?.property = null;
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expect(null, c?.property);
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expect(42, c.property ??= 42);
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expect(42, c.property ??= 87);
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expect(null, c?.property = null);
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c.property ??= 42;
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expect(42, c?.property);
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c.property ??= 87;
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expect(42, c?.property);
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c?.property = null;
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expect(null, c?.property);
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expect(42, Extension(c).property ??= 42);
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expect(42, Extension(c).property ??= 87);
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c?.property = null;
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expect(null, c?.property);
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Extension(c).property ??= 42;
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expect(42, c?.property);
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Extension(c).property ??= 87;
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expect(42, c?.property);
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c?.property = null;
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c.testImplicitThis();
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}
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expect(expected, actual) {
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if (expected != actual) {
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throw 'Mismatch: expected=$expected, actual=$actual';
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}
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} |