--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/coro1-refs-and-ctors.h	Mon May 25 07:50:57 2020 +0900
@@ -0,0 +1,144 @@
+struct coro1 {
+
+  struct promise_type {
+
+  promise_type () : vv(-1) {  PRINT ("Promise def. CTOR"); }
+  promise_type (int __x) : vv(__x) {  PRINTF ("Created Promise with %d\n",__x); }
+  promise_type (int __x, int& __y, int&& __z)
+    : vv(__x), v2(__y), v3(__z)
+    {  PRINTF ("Created Promise with %d, %d, %d\n", __x, __y, __z); }
+
+  ~promise_type() { PRINT ("Destroyed Promise"); }
+
+  auto get_return_object () {
+    PRINT ("get_return_object: handle from promise");
+    return handle_type::from_promise (*this);
+  }
+
+  auto initial_suspend () {
+    PRINT ("get initial_suspend (always)");
+    return suspend_always_prt{};
+  }
+  auto final_suspend () {
+    PRINT ("get final_suspend (always)");
+    return suspend_always_prt{};
+  }
+
+#ifdef USE_AWAIT_TRANSFORM
+
+  auto await_transform (int v) {
+    PRINTF ("await_transform an int () %d\n",v);
+    return suspend_always_intprt (v);
+  }
+
+  auto await_transform (long v) {
+    PRINTF ("await_transform a long () %ld\n",v);
+    return suspend_always_longprtsq (v);
+  }
+
+#endif
+
+  auto yield_value (int v) {
+    PRINTF ("yield_value (%d)\n", v);
+    vv = v;
+    return suspend_always_prt{};
+  }
+
+  void return_value (int v) {
+    PRINTF ("return_value (%d)\n", v);
+    vv = v;
+    
+  }
+
+  void unhandled_exception() { PRINT ("** unhandled exception"); }
+
+  int get_value () { return vv; }
+  int get_v2 () { return v2; }
+  int get_v3 () { return v3; }
+
+  private:
+    int vv;
+    int v2;
+    int v3;
+  };
+
+  using handle_type = coro::coroutine_handle<coro1::promise_type>;
+  handle_type handle;
+  coro1 () : handle(0) {}
+  coro1 (handle_type _handle)
+    : handle(_handle) {
+        PRINT("Created coro1 object from handle");
+  }
+  coro1 (const coro1 &) = delete; // no copying
+  coro1 (coro1 &&s) : handle(s.handle) {
+	s.handle = nullptr;
+	PRINT("coro1 mv ctor ");
+  }
+  coro1 &operator = (coro1 &&s) {
+	handle = s.handle;
+	s.handle = nullptr;
+	PRINT("coro1 op=  ");
+	return *this;
+  }
+  ~coro1() {
+        PRINT("Destroyed coro1");
+        if ( handle )
+          handle.destroy();
+  }
+
+  // Some awaitables to use in tests.
+  // With progress printing for debug.
+  struct suspend_never_prt {
+  bool await_ready() const noexcept { return true; }
+  void await_suspend(handle_type) const noexcept { PRINT ("susp-never-susp");}
+  void await_resume() const noexcept { PRINT ("susp-never-resume");}
+  };
+
+  struct  suspend_always_prt {
+  bool await_ready() const noexcept { return false; }
+  void await_suspend(handle_type) const noexcept { PRINT ("susp-always-susp");}
+  void await_resume() const noexcept { PRINT ("susp-always-resume");}
+  ~suspend_always_prt() { PRINT ("susp-always-dtor"); }
+  };
+
+  struct suspend_always_intprt {
+    int x;
+    suspend_always_intprt() : x(5) {}
+    suspend_always_intprt(int __x) : x(__x) {}
+    ~suspend_always_intprt() {}
+    bool await_ready() const noexcept { return false; }
+    void await_suspend(coro::coroutine_handle<>) const noexcept { PRINT ("susp-always-susp-intprt");}
+    int await_resume() const noexcept { PRINT ("susp-always-resume-intprt"); return x;}
+  };
+  
+  /* This returns the square of the int that it was constructed with.  */
+  struct suspend_always_longprtsq {
+    long x;
+    suspend_always_longprtsq() : x(12L) { PRINT ("suspend_always_longprtsq def ctor"); }
+    suspend_always_longprtsq(long _x) : x(_x) { PRINTF ("suspend_always_longprtsq ctor with %ld\n", x); }
+    ~suspend_always_longprtsq() {}
+    bool await_ready() const noexcept { return false; }
+    void await_suspend(coro::coroutine_handle<>) const noexcept { PRINT ("susp-always-susp-longsq");}
+    long await_resume() const noexcept { PRINT ("susp-always-resume-longsq"); return x * x;}
+  };
+
+  struct suspend_always_intrefprt {
+    int& x;
+    suspend_always_intrefprt(int& __x) : x(__x) {}
+    ~suspend_always_intrefprt() {}
+    bool await_ready() const noexcept { return false; }
+    void await_suspend(coro::coroutine_handle<>) const noexcept { PRINT ("susp-always-susp-intprt");}
+    int& await_resume() const noexcept { PRINT ("susp-always-resume-intprt"); return x;}
+  };
+
+  template <typename _AwaitType>
+  struct suspend_always_tmpl_awaiter {
+    _AwaitType x;
+    suspend_always_tmpl_awaiter(_AwaitType __x) : x(__x) {}
+    ~suspend_always_tmpl_awaiter() {}
+    bool await_ready() const noexcept { return false; }
+    void await_suspend(coro::coroutine_handle<>) const noexcept { PRINT ("suspend_always_tmpl_awaiter");}
+    _AwaitType await_resume() const noexcept { PRINT ("suspend_always_tmpl_awaiter"); return x;}
+  };
+
+};