// 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
///    typeParameter ::= metadata identifier (extends typeNotVoid)?
///    typeParameters ::= ‘<’ typeParameter (‘,’ typeParameter)* ‘>’
/// ...
/// If no extends clause is present, the upper bound is Object.
/// @description Checks that the upper bound is [Object] if [extends] clause is
/// absent.
/// @author iarkh@unipro.ru

class A {}
class B extends A {}
class C extends B {}

class D<T> {}

typedef Alias<T> = D<T>;

main() {
  D d1 = Alias();
  D d2 = Alias<A>();
  D d3 = Alias<B>();
  D d4 = Alias<C>();
  D d5 = Alias<Object>();
}