// Copyright (c) 2019, 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 generic type alias is a declaration [D] of one of the following
 * forms:
 * ...
 *   m typedef S? id<X1 extends B1, . . . , Xs extends Bs>(
 *   T1 p1, . . . , Tn pn, {Tn+1 pn+1, . . . , Tn+k pn+k});
 * ...
 * where [m] is derived from metadata, [T] is a type, and [S?] is a type or the
 * empty string. Let [S0] be [S?] if it is a type, otherwise let [S0] be
 * [dynamic]. The associated type of [D], call it [F], is, respectively:
 * ...
 *   S0 Function(T1, . . . , Tn, {Tn+1 xn+1, . . . , Tn+k xn+k})
 * ...
 * @description Checks that function generic type alias declaration can have
 * named arguments.
 * @author iarkh@unipro.ru
 */

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

typedef int test1<T extends num>(int x, {int? y, int? z});

int t1<T extends int>(int x, {int? y, int? z}) {
  return x + (y == null ? 0 : y)+ (z == null ? 0 : z);
}

main() {
  test1 res = t1;
  Expect.equals(19, t1(1, y: 14, z: 4));
  Expect.equals(1, res(1));
}