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, c++17, c++20
  
  // <string>
  
  //   constexpr bool contains(charT x) const noexcept;
  
  #include <string>
  #include <cassert>
  
  #include "test_macros.h"
  
  void test()
  {
      using S = std::string;
  
      S s1 {};
      S s2 {"abcde", 5};
  
      ASSERT_NOEXCEPT(s1.contains('e'));
  
      assert(!s1.contains('c'));
      assert(!s1.contains('e'));
      assert(!s1.contains('x'));
      assert( s2.contains('c'));
      assert( s2.contains('e'));
      assert(!s2.contains('x'));
  }
  
  int main(int, char**)
  {
      test();
  
      return 0;
  }
  