Language/Expressions/Function_Expressions/static_type_form_1_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 The static type of a function literal of the form
/// (T1 a1,...,Tn an, [Tn+1 xn+1 = d1,...,Tn+k xn+k = dk]) => e is
/// (T1,...,Tn, [Tn+1 xn+1,...,Tn+k xn+k]) -> T0, where T0 is the static type
/// of e.
/// In any case where Ti, 1 <= i <= n + k, is not specified, it is considered
/// to have been specified as dynamic.
/// @description Checks that a compile error occurs when assigning a
/// function literal of the form
/// (T1 a1,...,Tn an, [Tn+1 xn+1 = d1,...,Tn+k xn+k = dk]) => e where the type
/// of e is int to a variable of a function type with a boolean return type.
/// @author msyabro


typedef bool foo(int x, int y, [double? a, double? b]);

foo? f = null;

main() {
  f = (int x, int y, [double? a, double? b]) => 1;
//                                              ^
// [analyzer] unspecified
// [cfe] unspecified
}