Kallen Tu
9461df2084
These test basic correct usages of variance modifiers in fields and methods. Erroneous usages will come in a future CL, as well as more complex examples + subclassing. Change-Id: I05d547ac1db9e22235a0bf64b05fcb3e119e3157 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/119169 Commit-Queue: Kallen Tu <kallentu@google.com> Reviewed-by: Leaf Petersen <leafp@google.com> Reviewed-by: Erik Ernst <eernst@google.com>
57 lines
984 B
Dart
57 lines
984 B
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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// Tests various fields for the `in` variance modifier.
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// SharedOptions=--enable-experiment=variance
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import "package:expect/expect.dart";
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typedef Int2Void = void Function(int);
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class A<in T> {
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void set a(T value) => value;
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final void Function(T) b = (T val) {
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Expect.equals(2, val);
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};
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A<T> get c => this;
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}
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mixin BMixin<in T> {
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void set a(T value) => value;
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final void Function(T) b = (T val) {
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Expect.equals(2, val);
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};
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BMixin<T> get c => this;
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}
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class B with BMixin<int> {}
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void testClass() {
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A<int> a = new A();
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a.a = 2;
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Expect.type<Int2Void>(a.b);
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a.b(2);
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a.c.a = 2;
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}
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void testMixin() {
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B b = new B();
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b.a = 2;
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Expect.type<Int2Void>(b.b);
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b.b(2);
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b.c.a = 2;
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}
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main() {
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testClass();
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testMixin();
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}
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