| // Copyright (c) 2020, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| // Requirements=nnbd-weak |
| |
| import 'dart:_runtime' show typeRep, legacyTypeRep; |
| import 'dart:async'; |
| |
| import 'runtime_utils.dart' |
| show |
| checkSubtype, |
| checkProperSubtype, |
| checkMutualSubtype, |
| checkSubtypeFailure; |
| import 'runtime_utils_nnbd.dart'; |
| |
| class A {} |
| |
| class B extends A {} |
| |
| class C extends B {} |
| |
| class D<T extends B> {} |
| |
| class E<T, S> {} |
| |
| class F extends E<B, B> {} |
| |
| void main() { |
| // Top type symmetry. |
| // Object? <:> dynamic |
| checkMutualSubtype(typeRep<Object?>(), typeRep<dynamic>()); |
| // Object? <:> void |
| checkMutualSubtype(typeRep<Object?>(), typeRep<void>()); |
| // void <:> dynamic |
| checkMutualSubtype(typeRep<void>(), typeRep<dynamic>()); |
| |
| // Bottom is subtype of top. |
| // Never <: dynamic |
| checkProperSubtype(typeRep<Never>(), typeRep<dynamic>()); |
| // Never <: void |
| checkProperSubtype(typeRep<Never>(), typeRep<void>()); |
| // Never <: Object? |
| checkProperSubtype(typeRep<Never>(), typeRep<Object?>()); |
| |
| // Object is between top and bottom. |
| // Object <: Object? |
| checkSubtype(typeRep<Object>(), typeRep<Object?>()); |
| // Never <: Object |
| checkProperSubtype(typeRep<Never>(), typeRep<Object>()); |
| |
| // Null is between top and bottom. |
| // Null <: Object? |
| checkProperSubtype(typeRep<Null>(), typeRep<Object?>()); |
| // Never <: Null |
| checkSubtype(typeRep<Never>(), typeRep<Null>()); |
| |
| // Class is between Object and bottom. |
| // A <: Object |
| checkProperSubtype(typeRep<A>(), typeRep<dynamic>()); |
| // Never <: A |
| checkProperSubtype(typeRep<Never>(), typeRep<A>()); |
| |
| // Nullable types are a union of T and Null. |
| // A <: A? |
| checkSubtype(typeRep<A>(), typeRep<A?>()); |
| // Null <: A? |
| checkProperSubtype(typeRep<Null>(), typeRep<A?>()); |
| // A? <: Object? |
| checkProperSubtype(typeRep<A?>(), typeRep<Object?>()); |
| |
| // Legacy types will eventually be migrated to T or T? but until then are |
| // symmetric with both. |
| // Object* <:> Object |
| checkMutualSubtype(legacyTypeRep<Object>(), typeRep<Object>()); |
| // Object* <:> Object? |
| checkMutualSubtype(legacyTypeRep<Object>(), typeRep<Object?>()); |
| |
| // Bottom Types |
| // Null <: Object* |
| checkSubtype(typeRep<Null>(), legacyTypeRep<Object>()); |
| // Never <: Object* |
| checkSubtype(typeRep<Never>(), legacyTypeRep<Object>()); |
| // A* <:> A |
| checkMutualSubtype(legacyTypeRep<A>(), typeRep<A>()); |
| // A* <:> A? |
| checkMutualSubtype(legacyTypeRep<A>(), typeRep<A?>()); |
| // A* <: Object |
| checkProperSubtype(legacyTypeRep<A>(), typeRep<Object>()); |
| // A* <: Object? |
| checkProperSubtype(legacyTypeRep<A>(), typeRep<Object?>()); |
| // Null <: A* |
| checkProperSubtype(typeRep<Null>(), legacyTypeRep<A>()); |
| // Never <: A* |
| checkProperSubtype(typeRep<Never>(), legacyTypeRep<A>()); |
| |
| // Futures. |
| // Null <: FutureOr<Object?> |
| checkProperSubtype(typeRep<Null>(), typeRep<FutureOr<Object?>>()); |
| // Object <: FutureOr<Object?> |
| checkSubtype(typeRep<Object>(), typeRep<FutureOr<Object?>>()); |
| // Object? <:> FutureOr<Object?> |
| checkMutualSubtype(typeRep<Object?>(), typeRep<FutureOr<Object?>>()); |
| // Object <:> FutureOr<Object> |
| checkMutualSubtype(typeRep<Object>(), typeRep<FutureOr<Object>>()); |
| // Object <:> FutureOr<dynamic> |
| checkMutualSubtype(typeRep<Object>(), typeRep<FutureOr<dynamic>>()); |
| // Object <:> FutureOr<void> |
| checkMutualSubtype(typeRep<Object>(), typeRep<FutureOr<void>>()); |
| // Future<Object> <: FutureOr<Object?> |
| checkProperSubtype(typeRep<Future<Object>>(), typeRep<FutureOr<Object?>>()); |
| // Future<Object?> <: FutureOr<Object?> |
| checkProperSubtype(typeRep<Future<Object?>>(), typeRep<FutureOr<Object?>>()); |
| // FutureOr<Never> <: Future<Never> |
| checkSubtype(typeRep<FutureOr<Never>>(), typeRep<Future<Never>>()); |
| // Future<B> <: FutureOr<A> |
| checkProperSubtype(typeRep<Future<B>>(), typeRep<FutureOr<A>>()); |
| // B <: <: FutureOr<A> |
| checkProperSubtype(typeRep<B>(), typeRep<FutureOr<A>>()); |
| // Future<B> <: Future<A> |
| checkProperSubtype(typeRep<Future<B>>(), typeRep<Future<A>>()); |
| |
| // Interface subtypes. |
| // A <: A |
| checkSubtype(typeRep<A>(), typeRep<A>()); |
| // B <: A |
| checkProperSubtype(typeRep<B>(), typeRep<A>()); |
| // C <: B |
| checkProperSubtype(typeRep<C>(), typeRep<B>()); |
| // C <: A |
| checkProperSubtype(typeRep<C>(), typeRep<A>()); |
| |
| // Functions. |
| // A -> B <: Function |
| checkProperSubtype(typeRep<B Function(A)>(), typeRep<Function>()); |
| |
| // A -> B <: A -> B |
| checkSubtype(typeRep<B Function(A)>(), typeRep<B Function(A)>()); |
| |
| // A -> B <: B -> B |
| checkProperSubtype(typeRep<B Function(A)>(), typeRep<B Function(B)>()); |
| |
| // A -> B <: A -> A |
| checkProperSubtype(typeRep<B Function(A)>(), typeRep<A Function(A)>()); |
| |
| // Generic Function Subtypes. |
| // Bound is a built in type. |
| // <T extends int> void -> void <: <T extends int> void -> void |
| checkSubtype( |
| genericFunction(typeRep<int>()), genericFunction(typeRep<int>())); |
| |
| // <T extends String> A -> T <: <T extends String> B -> T |
| checkProperSubtype(functionGenericReturn(typeRep<String>(), typeRep<A>()), |
| functionGenericReturn(typeRep<String>(), typeRep<B>())); |
| |
| // <T extends double> T -> B <: <T extends double> T -> A |
| checkProperSubtype(functionGenericArg(typeRep<double>(), typeRep<B>()), |
| functionGenericArg(typeRep<double>(), typeRep<A>())); |
| |
| // Bound is a function type. |
| // <T extends A -> B> void -> void <: <T extends A -> B> void -> void |
| checkSubtype(genericFunction(typeRep<A Function(B)>()), |
| genericFunction(typeRep<A Function(B)>())); |
| |
| // <T extends A -> B> A -> T <: <T extends A -> B> B -> T |
| checkProperSubtype( |
| functionGenericReturn(typeRep<A Function(B)>(), typeRep<A>()), |
| functionGenericReturn(typeRep<A Function(B)>(), typeRep<B>())); |
| |
| // <T extends A -> B> T -> B <: <T extends A -> B> T -> A |
| checkProperSubtype(functionGenericArg(typeRep<A Function(B)>(), typeRep<B>()), |
| functionGenericArg(typeRep<A Function(B)>(), typeRep<A>())); |
| |
| // Bound is a user defined class. |
| // <T extends B> void -> void <: <T extends B> void -> void |
| checkSubtype(genericFunction(typeRep<B>()), genericFunction(typeRep<B>())); |
| |
| // <T extends B> A -> T <: <T extends B> B -> T |
| checkProperSubtype(functionGenericReturn(typeRep<B>(), typeRep<A>()), |
| functionGenericReturn(typeRep<B>(), typeRep<B>())); |
| |
| // <T extends B> T -> B <: <T extends B> T -> A |
| checkProperSubtype(functionGenericArg(typeRep<B>(), typeRep<B>()), |
| functionGenericArg(typeRep<B>(), typeRep<A>())); |
| |
| // Bound is a Future. |
| // <T extends Future<B>> void -> void <: <T extends Future<B>> void -> void |
| checkSubtype(genericFunction(typeRep<Future<B>>()), |
| genericFunction(typeRep<Future<B>>())); |
| |
| // <T extends Future<B>> A -> T <: <T extends Future<B>> B -> T |
| checkProperSubtype(functionGenericReturn(typeRep<Future<B>>(), typeRep<A>()), |
| functionGenericReturn(typeRep<Future<B>>(), typeRep<B>())); |
| |
| // <T extends Future<B>> T -> B <: <T extends Future<B>> T -> A |
| checkProperSubtype(functionGenericArg(typeRep<Future<B>>(), typeRep<B>()), |
| functionGenericArg(typeRep<Future<B>>(), typeRep<A>())); |
| |
| // Bound is a FutureOr. |
| // <T extends FutureOr<B>> void -> void <: |
| // <T extends FutureOr<B>> void -> void |
| checkSubtype(genericFunction(typeRep<FutureOr<B>>()), |
| genericFunction(typeRep<FutureOr<B>>())); |
| |
| // <T extends FutureOr<B>> A -> T <: <T extends FutureOr<B>> B -> T |
| checkProperSubtype( |
| functionGenericReturn(typeRep<FutureOr<B>>(), typeRep<A>()), |
| functionGenericReturn(typeRep<FutureOr<B>>(), typeRep<B>())); |
| |
| // <T extends FutureOr<B>> T -> B <: <T extends FutureOr<B>> T -> A |
| checkProperSubtype(functionGenericArg(typeRep<FutureOr<B>>(), typeRep<B>()), |
| functionGenericArg(typeRep<FutureOr<B>>(), typeRep<A>())); |
| |
| // Generics. |
| // D <:> D<B> |
| checkMutualSubtype(typeRep<D>(), typeRep<D<B>>()); |
| // D<C> <: D<B> |
| checkProperSubtype(typeRep<D<C>>(), typeRep<D<B>>()); |
| |
| // F <: E |
| checkProperSubtype(typeRep<F>(), typeRep<E>()); |
| // F <: E<A, A> |
| checkProperSubtype(typeRep<F>(), typeRep<E<A, A>>()); |
| // E<B, B> <: E |
| checkProperSubtype(typeRep<E<B, B>>(), typeRep<E>()); |
| // E<B, B> <: E<A, A> |
| checkProperSubtype(typeRep<E<B, B>>(), typeRep<E<A, A>>()); |
| |
| // Nullable interface subtypes. |
| // B <: A? |
| checkProperSubtype(typeRep<B>(), typeRep<A?>()); |
| // C <: A? |
| checkProperSubtype(typeRep<C>(), typeRep<A?>()); |
| // B? <: A? |
| checkProperSubtype(typeRep<B?>(), typeRep<A?>()); |
| // C? <: A? |
| checkProperSubtype(typeRep<C?>(), typeRep<A?>()); |
| |
| // Mixed mode. |
| // B* <: A |
| checkProperSubtype(legacyTypeRep<B>(), typeRep<A>()); |
| // B* <: A? |
| checkProperSubtype(legacyTypeRep<B>(), typeRep<A?>()); |
| // A* <\: B |
| checkSubtypeFailure(legacyTypeRep<A>(), typeRep<B>()); |
| // B? <: A* |
| checkProperSubtype(typeRep<B?>(), legacyTypeRep<A>()); |
| // B <: A* |
| checkProperSubtype(typeRep<B>(), legacyTypeRep<A>()); |
| // A <: B* |
| checkSubtypeFailure(typeRep<A>(), legacyTypeRep<B>()); |
| // A? <: B* |
| checkSubtypeFailure(typeRep<A?>(), legacyTypeRep<B>()); |
| |
| // Allowed in weak mode. |
| // dynamic <: Object |
| checkSubtype(typeRep<dynamic>(), typeRep<Object>()); |
| // void <: Object |
| checkSubtype(typeRep<void>(), typeRep<Object>()); |
| // Object? <: Object |
| checkSubtype(typeRep<Object?>(), typeRep<Object>()); |
| // A? <: Object |
| checkProperSubtype(typeRep<A?>(), typeRep<Object>()); |
| // A? <: A |
| checkSubtype(typeRep<A?>(), typeRep<A>()); |
| // Null <: Never |
| checkSubtype(typeRep<Null>(), typeRep<Never>()); |
| // Null <: Object |
| checkProperSubtype(typeRep<Null>(), typeRep<Object>()); |
| // Null <: A |
| checkProperSubtype(typeRep<Null>(), typeRep<A>()); |
| // Null <: FutureOr<A> |
| checkProperSubtype(typeRep<Null>(), typeRep<FutureOr<A>>()); |
| // Null <: Future<A> |
| checkProperSubtype(typeRep<Null>(), typeRep<Future<A>>()); |
| // FutureOr<Null> <: Future<Null> |
| checkSubtype(typeRep<FutureOr<Null>>(), typeRep<Future<Null>>()); |
| // Null <: Future<A?> |
| checkProperSubtype(typeRep<Null>(), typeRep<Future<A?>>()); |
| // FutureOr<Object?> <: Object |
| checkSubtype(typeRep<FutureOr<Object?>>(), typeRep<Object>()); |
| // FutureOr<dynamic> <: Object |
| checkSubtype(typeRep<FutureOr<dynamic>>(), typeRep<Object>()); |
| // FutureOr<void> <: Object |
| checkSubtype(typeRep<FutureOr<void>>(), typeRep<Object>()); |
| } |