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?])'.
}