--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/torture/co-ret-00-void-return-is-ready.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,90 @@
+//  { dg-do run }
+
+// Basic functionality check, co_return.
+// Here we check the case that initial suspend is "never", so that the co-
+// routine runs to completion immediately.
+
+#include "../coro.h"
+
+struct coro1 {
+  struct promise_type;
+  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();
+  }
+
+  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");}
+  ~suspend_never_prt() {};
+  };
+
+  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");}
+  };
+
+  struct promise_type {
+  promise_type() {  PRINT ("Created Promise"); }
+  ~promise_type() { PRINT ("Destroyed Promise"); }
+
+  coro1 get_return_object () {
+    PRINT ("get_return_object: from handle from promise");
+    return coro1 (handle_type::from_promise (*this));
+  }
+  auto initial_suspend () {
+    PRINT ("get initial_suspend (never) ");
+    return suspend_never_prt{};
+  }
+  auto final_suspend () {
+    PRINT ("get final_suspend (always) ");
+    return suspend_always_prt{};
+  }
+  void return_void () {
+    PRINT ("return_void ()");
+  }
+  void unhandled_exception() { PRINT ("** unhandled exception"); }
+  };
+};
+
+struct coro1
+f () noexcept
+{
+  PRINT ("coro1: about to return");
+  co_return;
+}
+
+int main ()
+{
+  PRINT ("main: create coro1");
+  struct coro1 x = f ();
+  PRINT ("main: got coro1 - should be done");
+  if (!x.handle.done())
+    {
+      PRINT ("main: apparently was not done...");
+      abort ();
+    }
+  PRINT ("main: returning");
+  return 0;
+}