//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14, c++17

// <memory>

// allocator:
// T* allocate(size_t n);

#include <memory>

struct incomplete;

void f() {
  {
    std::allocator<int> a;
    a.allocate(3); // expected-warning {{ignoring return value of function declared with 'nodiscard' attribute}}
  }
  {
    std::allocator<void> a;
    [[maybe_unused]] auto b =
        a.allocate(3); // expected-error@*:* {{invalid application of 'sizeof' to an incomplete type 'void'}}
  }
  {
    std::allocator<incomplete> a;
    [[maybe_unused]] auto b =
        a.allocate(3); // expected-error@*:* {{invalid application of 'sizeof' to an incomplete type 'incomplete'}}
  }
}