Language/Expressions/Identifier_Reference/built_in_identifier_t42.dart

// Copyright (c) 2016, 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 It is a compile-time error if a built-in identifier is used as
 * the declared name of a prefix, class, type parameter or type alias.
 * @description Checks that it is a compile-time error if a built-in identifier
 * "external" is used as the declared name of a type variable.
 * @compile-error
 * @author ngl@unipro.ru
 */

class A<external> {
  bool check(x) => x is external;
}

main() {
  A();
}