LanguageFeatures/Simple-bounds/static/typedef_l1_t05.dart

// Copyright (c) 2018, 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.

// @dart = 2.9

/// a type [T] on the form qualified (for instance, [C] or [p.D]) which denotes a
/// generic class or parameterized type alias [G1] (that is, [T] is a raw type),
/// every type argument of [G1] has a simple bound.
/// @description Checks that simple bounds are correct for [typedef] with [X
/// extends num] parameter (covariant)
/// @author iarkh@unipro.ru

typedef G<X extends num> = void Function<Y extends X>();

main() {
  G source;
  void Function<X extends num>() target = source;
  void Function<X extends dynamic>() target1 = source; //# 01: compile-time error
  void Function<Null>()              target2 = source; //# 02: compile-time error
}