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8064c1c342
Also add `legacyTypeRep<T>()` that is similar but performs a shallow conversion to a legacy type. Using this in compiler/dartdevc_native/ tests gives a better usability instead of constantly wrapping and unwrapping types. It allows us to avoid stripping off the legacy from a type when calling `wrapType()`. Issue: https://github.com/dart-lang/sdk/issues/40266 Change-Id: I07225f18c253222b31203b0b110233a3e018a7d0 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/142547 Commit-Queue: Nicholas Shahan <nshahan@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>
53 lines
1.4 KiB
Dart
53 lines
1.4 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 = 2.6
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// SharedOptions=--enable-experiment=variance
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// Tests the emission of explicit variance modifiers.
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import 'dart:_runtime'
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show wrapType, unwrapType, getGenericArgVariances, Variance, typeRep;
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import 'package:expect/expect.dart';
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class A<in T> {}
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class B<out T> {}
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class C<inout T> {}
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class D<T> {}
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class E<inout X, out Y, in Z> {}
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mixin F<in T> {}
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class G<inout T> = Object with F<T>;
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List getVariances(Object t) {
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// TODO(nshahan) Update to handle legacy wrapper when we unfork dart:_runtime.
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var type = unwrapType(wrapType(t));
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return getGenericArgVariances(type);
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}
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main() {
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Expect.listEquals([Variance.contravariant], getVariances(typeRep<A>()));
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Expect.listEquals([Variance.covariant], getVariances(typeRep<B>()));
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Expect.listEquals([Variance.invariant], getVariances(typeRep<C>()));
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// Implicit variance is not emitted into the generated code.
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Expect.isNull(getVariances(typeRep<D>()));
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Expect.listEquals(
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[Variance.invariant, Variance.covariant, Variance.contravariant],
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getVariances(typeRep<E>()));
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Expect.listEquals([Variance.contravariant], getVariances(typeRep<F>()));
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Expect.listEquals([Variance.invariant], getVariances(typeRep<G>()));
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}
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