// 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 function type t1 is not a subtype of function type
/// t2 if the declared type of an positional optional parameter of t1 is not
/// assignable to a corresponding parameter of t2 (both t1 and t2 have a single
/// positional optional parameter).
/// @author iefremov

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

class A {}
class B {}

typedef t1([int p]);
typedef t3([A? p]);
typedef t4([List<A> p]);
typedef t5([t1? p]);

main() {
  Expect.isFalse(([double p = 3.14]) {} is t1);
  Expect.isFalse(([bool p = false]) {} is t1);
  Expect.isFalse(([A? p]) {} is t1);
  Expect.isFalse(([List<int> p = const [3, 1, 4]]) {} is t1);
  Expect.isFalse(([t3? p]) {} is t1);

  Expect.isFalse(([double p = 0]) {} is t3);
  Expect.isFalse(([bool p = true]) {} is t3);
  Expect.isFalse(([List<int> p = const []]) {} is t3);
  Expect.isFalse(([t3? p]) {} is t3);
  Expect.isFalse(([B? p]) {} is t3);

  Expect.isFalse(([double p = 0]) {} is t4);
  Expect.isFalse(([bool p = false]) {} is t4);
  Expect.isFalse(([A? p]) {} is t4);
  Expect.isFalse(([List<int> p = const [3, 1, 4]]) {} is t4);
  Expect.isFalse(([List<B>? p]) {} is t4);
  Expect.isFalse(([t3? p]) {} is t4);

  Expect.isFalse(([double p = 3.14]) {} is t5);
  Expect.isFalse(([bool p = false]) {} is t5);
  Expect.isFalse(([A? p]) {} is t5);
  Expect.isFalse(([List<int> p = const [1, 2, 3]]) {} is t5);
  Expect.isFalse(([t3? p]) {} is t5);
  Expect.isFalse(([t4? p]) {} is t5);
  Expect.isFalse(([t5? p]) {} is t5);
}