--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/torture/co-ret-06-template-promise-val-1.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,105 @@
+//  { dg-do run }
+
+// Test returning a T.
+// We will use the promise to contain this to avoid having to include
+// additional C++ headers.
+
+#include "../coro.h"
+
+struct suspend_never_prt {
+  bool await_ready() const noexcept { return true; }
+  void await_suspend(coro::coroutine_handle<>) const noexcept
+    { PRINT ("susp-never-susp"); }
+  void await_resume() const noexcept { PRINT ("susp-never-resume");}
+};
+
+/* NOTE: this has a DTOR to test that pathway.  */
+struct  suspend_always_prt {
+  bool await_ready() const noexcept { return false; }
+  void await_suspend(coro::coroutine_handle<>) const noexcept
+    { PRINT ("susp-always-susp"); }
+  void await_resume() const noexcept { PRINT ("susp-always-resume"); }
+  ~suspend_always_prt() { PRINT ("susp-always-DTOR"); }
+};
+
+template <typename T>
+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 promise_type {
+  T value;
+  promise_type() {  PRINT ("Created Promise"); }
+  ~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 () const {
+    PRINT ("get initial_suspend (always)");
+    return suspend_always_prt{};
+  }
+  auto final_suspend () const {
+    PRINT ("get final_suspend (always)");
+    return suspend_always_prt{};
+  }
+  void return_value (T v) {
+    PRINTF ("return_value () %d\n",v);
+    value = v;
+  }
+  T get_value (void) { return value; }
+  void unhandled_exception() { PRINT ("** unhandled exception"); }
+  };
+};
+
+coro1<float>
+f () noexcept
+{
+  PRINT ("coro1: about to return");
+  co_return (float) 42;
+}
+
+int main ()
+{
+  PRINT ("main: create coro1");
+  coro1<float> x = f ();
+  PRINT ("main: got coro1 - resuming");
+  if (x.handle.done())
+    abort();
+  x.handle.resume();
+  PRINT ("main: after resume");
+  int y = x.handle.promise().get_value();
+  if ( y != (float)42 )
+    abort ();
+  if (!x.handle.done())
+    {
+      PRINT ("main: apparently not done...");
+      abort ();
+    }
+  PRINT ("main: returning");
+  return 0;
+}