text: //===----------------------------------------------------------------------===//
  //
  // 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
  
  // <charconv>
  
  // struct to_chars_result
  //   friend bool operator==(const to_chars_result&, const to_chars_result&) = default;
  
  // [charconv.syn]/2
  // The types to_chars_result and from_chars_result have the data members and
  // special members specified above. They have no base classes or members other
  // than those specified.
  
  #include <charconv>
  
  #include <cassert>
  #include <compare>
  #include <concepts>
  
  #include "test_macros.h"
  
  constexpr bool test() {
    std::to_chars_result lhs{nullptr, std::errc{}};
  #if TEST_STD_VER > 17
    std::to_chars_result rhs{nullptr, std::errc{}};
    assert(lhs == rhs);
    assert(!(lhs != rhs));
  #endif
    auto [ptr, ec] = lhs;
    static_assert(std::is_same_v<decltype(ptr), char*>);
    assert(ptr == lhs.ptr);
    static_assert(std::is_same_v<decltype(ec), std::errc>);
    assert(ec == lhs.ec);
  
    return true;
  }
  
  int main(int, char**) {
  #if TEST_STD_VER > 17
    static_assert(std::equality_comparable<std::to_chars_result>);
    static_assert(!std::totally_ordered<std::to_chars_result>);
    static_assert(!std::three_way_comparable<std::to_chars_result>);
  #endif
  
    assert(test());
    static_assert(test());
  
    return 0;
  }
  