| // 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 We define inherited(J, K) to be |
| * the set of members m such that all of the following hold: |
| * • m is accessible to K and |
| * • A is a direct superinterface of J and either |
| * – A declares a member m or |
| * – m is a member of inherited(A, K). |
| * • m is not overridden by J. |
| * ... |
| * Otherwise, if the static types T1,...,Tk of the members m1,...,mk are not |
| * identical, then there must be a member mx such that Tx <: Ti, 1 ≤ x ≤ k for |
| * all i ∈ 1..k, or a static type warning occurs. The member that is inherited |
| * is mx, if it exists; otherwise: let numberOf P ositionals(f) denote the |
| * number of positional parameters of a function f, and let numberOf |
| * RequiredParams(f) denote the number of required parameters of a function f. |
| * Furthermore, let s denote the set of all named parameters of the m1,...,mk. |
| * Then let |
| * h = max(numberOf Positionals(mi)), |
| * r = min(numberOf RequiredParams(mi)), i ∈ 1..k. |
| * Then I has a method named n, with r required parameters of type dynamic, |
| * h positional parameters of type dynamic, named parameters s of type dynamic |
| * and return type dynamic. |
| * @description Checks that if two methods with the same name but different |
| * parameters are inherited then it is a compile error |
| * @compile-error |
| * @author sgrekhov@unipro.ru |
| */ |
| |
| class A {} |
| class B extends A {} |
| class C {} |
| class D extends C {} |
| |
| abstract class SI1 { |
| void foo(A v1, D v2); |
| } |
| |
| abstract class SI2 { |
| void foo(B v1, C v2); |
| } |
| |
| abstract class I implements SI1, SI2 {} |
| |
| main() { |
| I? i = null; |
| } |
