| /* |
| * 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 variable and S is the upper bound of T. |
| * - 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. |
| * T is a subtype of S, written T <: S, iff [⊥/Dynamic]T << S. |
| * A type T may be assigned to a type S, written T <=> S, if either T <: S or S <: T . |
| * @description Checks that an interface type that is a subtype of a generic type A with type parameter t1 is not |
| * assignable to A parameterized with a type parameter that is not a supertype of t1. |
| * @static-warning |
| * @author iefremov |
| * @reviewer rodionov |
| */ |
| |
| class A<T> {} |
| class B extends A<int> {} |
| |
| A<double> checker(){} |
| |
| main() { |
| B b = checker(); /// static type warning |
| } |
