Language/Types/Function_Types/subtype_required_args_t03.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. ∀i ∈ 1..n, Ti ⇐⇒ Si.
/// @description Checks that formal parameter names have no effect on determining
/// whether or not a function is a subtype of another, only their types are
/// important.
/// @author iefremov

import "../../../Utils/expect.dart";

typedef f(int someComplexName);

main() {
  Expect.isTrue((int someOtherComplexName6031769) {} is f);
  Expect.isFalse((double someComplexName) {} is f);
  Expect.runtimeIsType<f>((int someOtherComplexName6031769) {});
  Expect.runtimeIsNotType<f>((double someComplexName) {});
}