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(C++20)
 std::coroutine_handle
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 std::coroutine_handle<std::noop_coroutine_promise>,
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 , await
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 , await
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(C++20)
 coroutine_handle
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#include <compare>

namespace std {
  //  
  template<class R, class... ArgTypes>
    struct coroutine_traits;

  //  
  template<class Promise = void>
    struct coroutine_handle;

  //  
  constexpr bool operator==(coroutine_handle<> x, coroutine_handle<> y) noexcept;
  constexpr strong_ordering operator<=>(coroutine_handle<> x, coroutine_handle<> y) noexcept;

  //  
  template<class T> struct hash;
  template<class P> struct hash<coroutine_handle<P>>;

  //  
  struct noop_coroutine_promise;

  template<> struct coroutine_handle<noop_coroutine_promise>;
  using noop_coroutine_handle = coroutine_handle<noop_coroutine_promise>;

  noop_coroutine_handle noop_coroutine() noexcept;

  //  
  struct suspend_never;
  struct suspend_always;
}

std::coroutine_handle

namespace std {
  template<>
  struct coroutine_handle<void>
  {
    // /
    constexpr coroutine_handle() noexcept;
    constexpr coroutine_handle(nullptr_t) noexcept;
    coroutine_handle& operator=(nullptr_t) noexcept;

    // /
    constexpr void* address() const noexcept;
    static constexpr coroutine_handle from_address(void* addr);

    // 
    constexpr explicit operator bool() const noexcept;
    bool done() const;

    // 
    void operator()() const;
    void resume() const;
    void destroy() const;

  private:
    void* ptr;  //  
  };

  template<class Promise>
  struct coroutine_handle
  {
    // /
    constexpr coroutine_handle() noexcept;
    constexpr coroutine_handle(nullptr_t) noexcept;
    static coroutine_handle from_promise(Promise&);
    coroutine_handle& operator=(nullptr_t) noexcept;
  
    // /
    constexpr void* address() const noexcept;
    static constexpr coroutine_handle from_address(void* addr);
  
    // 
    constexpr operator coroutine_handle<>() const noexcept;
  
    // 
    constexpr explicit operator bool() const noexcept;
    bool done() const;
  
    // 
    void operator()() const;
    void resume() const;
    void destroy() const;
  
    //  
    Promise& promise() const;
  
  private:
    void* ptr;  //  
  };
}

std::noop_coroutine_promise

namespace std {
  struct noop_coroutine_promise {};
}

std::coroutine_handle<std::noop_coroutine_promise>

namespace std {
  template<>
  struct coroutine_handle<noop_coroutine_promise>
  {
    // 
    constexpr operator coroutine_handle<>() const noexcept;

    // 
    constexpr explicit operator bool() const noexcept;
    constexpr bool done() const noexcept;

    // 
    constexpr void operator()() const noexcept;
    constexpr void resume() const noexcept;
    constexpr void destroy() const noexcept;

    //  
    noop_coroutine_promise& promise() const noexcept;

    // 
    constexpr void* address() const noexcept;
  private:
    coroutine_handle(/*   */);
    void* ptr; //  
  };
}

std::suspend_never

namespace std {
  struct suspend_never {
    constexpr bool await_ready() const noexcept { return true; }
    constexpr void await_suspend(coroutine_handle<>) const noexcept {}
    constexpr void await_resume() const noexcept {}
  };
}

std::suspend_always

namespace std {
  struct suspend_always {
    constexpr bool await_ready() const noexcept { return false; }
    constexpr void await_suspend(coroutine_handle<>) const noexcept {}
    constexpr void await_resume() const noexcept {}
  };
}
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