// 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.

method2() {
  return (String s) => s;
}

class Class2 {}

method4() {
  return (Class2? c1, Class2? c2) => c1;
}

test4(o) => o is Class2? Function(Class2?, Class2?);

method6(Class2? c, int i, String s) {}

test6(o) => o is Function(Class2?, int, String);