| // Copyright (c) 2011, 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 type T is more specific than a type S, written T << S, if one |
| * of the following conditions is met: |
| * • T is S. |
| * • T is ⊥ |
| * • S is dynamic. |
| * • S is a direct supertype of T. |
| * • T is a type parameter and S is the upper bound of T. |
| * • T is a type parameter and S is Object. |
| * • T is of the form I<T1, ..., Tn > and S is of the form I <S1, ..., Sn> |
| * and Ti << Si 1 <= i <= n. |
| * • T and S are both function types, and T << S under the rules of section |
| * (Types/Function Types). |
| * • T is a function type and S is Function. |
| * • T << U and U << S. |
| * << is a partial order on types. T is a subtype of S, written T <: S, iff |
| * [⊥/Dynamic]T << S. |
| * . . . |
| * An interface type T may be assigned to a type S, written T <=> S, if either |
| * T <: S or S <: T. |
| * @description Checks that two generic types are not assignable even if just |
| * one type argument is not assignable. Using complex generic types. |
| * @compile-error |
| * @author iefremov |
| */ |
| |
| class I<A, B, C> {} |
| class J<A, B, C> extends I<A, B, C> {} |
| class K extends J {} |
| class C extends K {} |
| |
| typedef J f(I<J, List<Map>, num> i, [List j]); |
| typedef K f_1(I<K, List<Map<int, num>>, int> i, [List<Map> j]); |
| |
| I<f, num, List<Map<num, Map<int, double>>>>? checker() {} |
| |
| main() { |
| // I<f_1, int, List<Map<int, Map<int, int>>>> i = new I<f, num, List<Map<num, Map<int, double>>>>(); |
| // ^^^ <=/=> ^^^ |
| I<f_1, int, List<Map<int, Map<int, int>>>>? i = checker(); |
| } |