//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// Prevent emission of the deprecated warning.
#ifdef __clang__
#pragma clang diagnostic ignored "-W#warnings"
#endif
// Poison the std:: names we might use inside __gnu_cxx to ensure they're
// properly qualified.
struct allocator;
struct pair;
struct equal_to;
struct unique_ptr;
#include <ext/hash_set>

namespace __gnu_cxx {
template class hash_set<int>;
}

int main(int, char**) {
  typedef __gnu_cxx::hash_set<int> Set;
  Set s;
  Set s2(s);
  ((void)s2);

  return 0;
}