Language/15_Types/5_Function_Types_A03_t10.dart

/*
 * 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 The function type (T1, ... Tn, {Tx1 x1, ..., Txk xk}) -> T is a subtype of the function
 * type (S1, ..., Sn, {Sy1 y1, ..., Sym ym }) -> S, if all of the following conditions are met:
 * 1. Either S is void, or T <=> S.
 * 2. For all i 1 <= i <= n, Ti <=> Si.
 * 3. k >= m and yi belongs to {x1, ..., xk} for each i in 1..m.
 * 4. For all y in {y1, ..., ym}, yi = xj  =>  Tj <=> Si
 * @description Checks that function type t1 is not a subtype of function type t2 
 * even if just one of its required parameters has a type that is not mutually assignable
 * with the type of the corresponding required parameter of t2.
 * @author rodionov
 * @reviewer kaigorodov
 */
import "../../Utils/expect.dart";

class B {}

typedef B func(Object o);
typedef B t1(int i, B b, Map<int, num> m, var x, {var ox, B ob, List<num> ol, bool obool});

B f1(double i, B b, Map<int, num> m, var x, {var ox, B ob, List<num> ol, bool obool}) {}
//    ^^^ double <=/=> int
B f2(int i, func b, Map<int, num> m, var x, {var ox, B ob, List<num> ol, bool obool}) {}
//          ^^^ func <=/=> B
B f3(int i, B b, Map<int, func> m, var x, {var ox, B ob, List<num> ol, bool obool}) {}
//                       ^^^ func <=/=> num

main() {
  Expect.isFalse(f1 is t1);
  Expect.isFalse(f2 is t1);
  Expect.isFalse(f3 is t1);
}