Konstantin Shcheglov
ba92b78acd
Bug: https://github.com/dart-lang/sdk/issues/42821 Change-Id: I153c48d7a2e4a02026928e6203aacf8f2dc029ba Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/155849 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>
61 lines
2.7 KiB
Dart
61 lines
2.7 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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// Tests local inference errors for the `inout` variance modifier.
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// SharedOptions=--enable-experiment=variance
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class Covariant<out T> {}
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class Contravariant<in T> {}
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class Invariant<inout T> {}
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class Exactly<inout T> {}
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class Upper {}
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class Middle extends Upper {}
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class Lower extends Middle {}
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Exactly<T> inferInvInv<T>(Invariant<T> x, Invariant<T> y) => new Exactly<T>();
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Exactly<T> inferInvCov<T>(Invariant<T> x, Covariant<T> y) => new Exactly<T>();
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Exactly<T> inferInvContra<T>(Invariant<T> x, Contravariant<T> y) => new Exactly<T>();
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main() {
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// Middle <: T <: Middle and int <: T <: int are not valid constraints.
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inferInvInv(Invariant<Middle>(), Invariant<int>());
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// ^^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.ARGUMENT_TYPE_NOT_ASSIGNABLE
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// [cfe] The argument type 'Invariant<Middle>' can't be assigned to the parameter type 'Invariant<Object>'.
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// ^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.ARGUMENT_TYPE_NOT_ASSIGNABLE
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// [cfe] The argument type 'Invariant<int>' can't be assigned to the parameter type 'Invariant<Object>'.
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// Middle <: T <: Middle and Upper <: T <: Upper are not valid constraints.
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inferInvInv(Invariant<Middle>(), Invariant<Upper>());
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// ^^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.ARGUMENT_TYPE_NOT_ASSIGNABLE
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// [cfe] The argument type 'Invariant<Middle>' can't be assigned to the parameter type 'Invariant<Upper>'.
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// Middle <: T <: Middle and Lower <: T <: Lower are not valid constraints.
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inferInvInv(Invariant<Middle>(), Invariant<Lower>());
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// ^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.ARGUMENT_TYPE_NOT_ASSIGNABLE
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// [cfe] The argument type 'Invariant<Lower>' can't be assigned to the parameter type 'Invariant<Middle>'.
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// Upper <: T
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// Middle <: T <: Middle
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// Upper <: T <: Middle is not a valid constraint.
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inferInvCov(Invariant<Middle>(), Covariant<Upper>());
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// ^^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.ARGUMENT_TYPE_NOT_ASSIGNABLE
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// [cfe] The argument type 'Invariant<Middle>' can't be assigned to the parameter type 'Invariant<Upper>'.
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// T <: Lower
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// Middle <: T <: Lower
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// Middle <: T <: Lower is not a valid constraint
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inferInvContra(Invariant<Middle>(), Contravariant<Lower>());
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// ^^^^^^^^^^^^^^^^^^^^^^
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// [analyzer] COMPILE_TIME_ERROR.ARGUMENT_TYPE_NOT_ASSIGNABLE
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// [cfe] The argument type 'Contravariant<Lower>' can't be assigned to the parameter type 'Contravariant<Middle>'.
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}
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