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++98, c++03, c++11, c++14, c++17
  
  // <functional>
  //
  // reference_wrapper<T>
  //
  //  where T is an incomplete type (since C++20)
  
  
  #include <functional>
  #include <cassert>
  
  
  struct Foo;
  
  Foo& get_foo();
  
  void test() {
      Foo& foo = get_foo();
      std::reference_wrapper<Foo> ref{foo};
      assert(&ref.get() == &foo);
  }
  
  struct Foo { };
  
  Foo& get_foo() {
      static Foo foo;
      return foo;
  }
  
  int main() {
      test();
  }
  