Kallen Tu
550985189c
When an explicitly defined type variable is used in an incorrect variance position in a (final/non-final) field, an error is emitted. Change-Id: Id1af7bdcd9adfe0c94ee76612c58ff63d011a1fb Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/122881 Commit-Queue: Kallen Tu <kallentu@google.com> Reviewed-by: Dmitry Stefantsov <dmitryas@google.com> Reviewed-by: Leaf Petersen <leafp@google.com>
73 lines
1.2 KiB
Dart
73 lines
1.2 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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// Tests various fields for the `out` variance modifier.
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// SharedOptions=--enable-experiment=variance
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import "package:expect/expect.dart";
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typedef Void2Int = int Function();
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class A<out T> {
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final T a = null;
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final T Function() b = () => null;
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T get c => null;
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A<T> get d => this;
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covariant T e;
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void set f(covariant T value) => value;
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}
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mixin BMixin<out T> {
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final T a = null;
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final T Function() b = () => null;
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T get c => null;
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BMixin<T> get d => this;
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covariant T e;
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void set f(covariant T value) => value;
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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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Expect.isNull(a.a);
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Expect.type<Void2Int>(a.b);
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Expect.isNull(a.b());
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Expect.isNull(a.c);
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Expect.isNull(a.d.a);
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a.e = 2;
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Expect.equals(2, a.e);
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a.f = 2;
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}
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void testMixin() {
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B b = new B();
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Expect.isNull(b.a);
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Expect.type<Void2Int>(b.b);
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Expect.isNull(b.b());
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Expect.isNull(b.c);
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Expect.isNull(b.d.a);
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b.e = 2;
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Expect.equals(2, b.e);
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b.f = 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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