Language/Expressions/Function_Expressions/static_type_dynamic_async_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]) async {s} is
/// (T1,...,Tn, [Tn+1 xn+1,...,Tn+k xn+k]) -> Future.
/// In any case where Ti, 1 <= i <= n + k, is not specified, it is considered
/// to have been specified as dynamic.
/// @description Checks that it is a compile error warning if a function literal
/// of the form (T1 a1,...,Tn an, [Tn+1 xn+1 = d1,...,Tn+k xn+k = dk]) async {s}
/// with two parameters is assigned to a variable of a function type with two
/// parameters that do not correspond to function literal parameters.
/// @author ngl@unipro.ru


import 'dart:async';

typedef Future futureFuncParam(int p1, [int? p2]);

main() {
  futureFuncParam ffp1 = (int p1, [int? p2]) async { return 5; };
  ffp1 = (bool p1, [int? p2]) async { return 1; };
  //     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  // [analyzer] COMPILE_TIME_ERROR.INVALID_ASSIGNMENT
  // [cfe] A value of type 'Future<int> Function(bool, [int?])' can't be assigned to a variable of type 'Future<dynamic> Function(int, [int?])'.
}