| // Copyright (c) 2019, 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. |
| |
| /// @assertion A generic type alias is a declaration [D] of one of the following |
| /// forms: |
| /// m typedef id<X1 extends B1, . . . , Xs extends Bs> = T; |
| /// m typedef S? id<X1 extends B1, . . . , Xs extends Bs>( |
| /// T1 p1, . . . , Tn pn, [Tn+1 pn+1, . . . , Tn+k pn+k]); |
| /// m typedef S? id<X1 extends B1, . . . , Xs extends Bs>( |
| /// T1 p1, . . . , Tn pn, {Tn+1 pn+1, . . . , Tn+k pn+k}); |
| /// where [m] is derived from metadata, [T] is a type, and [S?] is a type or the |
| /// empty string. Let [S0] be [S?] if it is a type, otherwise let [S0] be |
| /// [dynamic]. The associated type of [D], call it [F], is, respectively: |
| /// T |
| /// S0 Function(T1, . . . , Tn, [Tn+1, . . . , Tn+k]) |
| /// S0 Function(T1, . . . , Tn, {Tn+1 xn+1, . . . , Tn+k xn+k}) |
| /// ... |
| /// Moreover, let [T1], . . . , [Tl] be types and let [U] be the parameterized |
| /// type id<T1, . . . , Tl> in a location where [id] denotes [D]. ... It is a |
| /// compile-time error if [U] is not well-bounded |
| /// @description Checks that compile error is thrown if [U] is not well-bounded. |
| /// @Issue 36959, 37050 |
| /// @author iarkh@unipro.ru |
| |
| class A<X extends A<X>> {} |
| |
| typedef AAlias<T extends A<T>>(T); |
| |
| main() { |
| AAlias a1; |
| AAlias<A> a2; |
| AAlias<A<Never>> a3; |
| AAlias<A<dynamic>> a4; |
| AAlias<A<Object?>> a5; |
| AAlias<A<int>> a6; |
| // ^^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| AAlias<int> a7; |
| // ^^^ |
| // [analyzer] COMPILE_TIME_ERROR.TYPE_ARGUMENT_NOT_MATCHING_BOUNDS |
| // ^ |
| // [cfe] Type argument 'int' doesn't conform to the bound 'A<T>' of the type variable 'T' on 'AAlias'. |
| AAlias<dynamic> a8; |
| AAlias<A<Null>> a9; |
| // ^^^^^^^ |
| // [analyzer] unspecified |
| // [cfe] unspecified |
| } |