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Mark tests that contain errors about using a class as a mixin to use language version 2.19 where that's not an error. This may not fix all of the tests because it's the language version of the library where the class is declared that matters, not where the class is used as a mixin. But most tests have all of their declarations in the same library, so this should fix most. Change-Id: I910439ebd2f10f731418dc588b7e4619a0841c16 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/285923 Reviewed-by: Jake Macdonald <jakemac@google.com> Commit-Queue: Jake Macdonald <jakemac@google.com>
78 lines
2.2 KiB
Dart
78 lines
2.2 KiB
Dart
// Copyright (c) 2018, 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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// TODO(51557): Decide if the mixins being applied in this test should be
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// "mixin", "mixin class" or the test should be left at 2.19.
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// @dart=2.19
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import "package:expect/expect.dart";
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abstract class A<T> {
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// This is ok because type inference will ensure that in C, A and M are
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// instantiated with the same T.
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T f(T x) => x; //# 01: ok
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}
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class B {}
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mixin M1<T> on A<T> {
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T f(T x) => x;
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T g(T x) => x;
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Type h() => T;
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}
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class M2<T> {
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T g(T x) => x;
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Type h() => T;
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}
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// Inferred as `class C extends A<B> with M1<B>`
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class C extends A<B> with M1 {}
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// Inferred as `class D = A<B> with M1<B>`
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class D = A<B> with M1;
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// Inferred as `class E extends Object with M2<dynamic>`
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class E extends Object with M2 {}
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// Ok because a type parameter is supplied
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class F extends Object with M2<B> {}
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main() {
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C c = new C();
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D d = new D();
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E e = new E();
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F f = new F();
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// M1 is instantiated with B, so C.g has type (B) -> B.
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B Function(B) x = c.g; //# 02: ok
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B Function(B) x = d.g; //# 03: ok
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Null Function(Null) x = c.g; //# 04: compile-time error
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Null Function(Null) x = d.g; //# 05: compile-time error
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Object Function(Object) x = c.g; //# 06: compile-time error
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Object Function(Object) x = d.g; //# 07: compile-time error
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// And verify that the runtime system has the right type for the type
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// parameter
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Expect.equals(c.h(), B); //# 08: ok
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Expect.equals(c.h(), B); //# 09: ok
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// M2 is instantiated with dynamic, so E.g has type (dynamic) -> dynamic.
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dynamic Function(dynamic) x = e.g; //# 10: ok
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B Function(B) x = e.g; //# 11: compile-time error
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// And verify that the runtime system has the right type for the type
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// parameter
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Expect.equals(e.h(), dynamic); //# 12: ok
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// M2 is instantiated with B, so F.g has type (B) -> B.
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B Function(B) x = f.g; //# 13: ok
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Null Function(Null) x = f.g; //# 14: compile-time error
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Object Function(Object) x = f.g; //# 15: compile-time error
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// And verify that the runtime system has the right type for the type
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// parameter
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Expect.equals(f.h(), B); //# 16: ok
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}
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