Language/15_Types/5_Function_Types_A01_t02.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 A function type (T1,...Tk,[Tk+1,...,Tn+m]) -> T is a subtype of the function
 * type (S1,...,Sk+j,[Sk+j+1,...,Sn]) -> 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.
 * @description Checks that this statement is true for function types with no arguments:
 * S is some type, T is Dynamic (assignable to S).
 * @author iefremov
 * @reviewer rodionov
 */
import "../../Utils/expect.dart";

typedef t1();
typedef void t2();
typedef int t3();
typedef String t4();
typedef double t5();
typedef Object t6();
typedef t1 t7();
typedef List t8();
typedef List<int> t9();
typedef Map<int, List<List<List>>> t10();
typedef t10 t11();
typedef t11 t12();


main() {
  Expect.isTrue(() {} is t1);
  Expect.isTrue(() {} is t2);
  Expect.isTrue(() {} is t3);
  Expect.isTrue(() {} is t4);
  Expect.isTrue(() {} is t5);
  Expect.isTrue(() {} is t6);
  Expect.isTrue(() {} is t7);
  Expect.isTrue(() {} is t8);
  Expect.isTrue(() {} is t9);
  Expect.isTrue(() {} is t10);
  Expect.isTrue(() {} is t11);
  Expect.isTrue(() {} is t12);
}