--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/torture/co-await-05-loop.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,51 @@
+//  { dg-do run }
+
+// Check correct operation of co_await in a loop without local state.
+
+#include "../coro.h"
+
+// boiler-plate for tests of codegen
+#define USE_AWAIT_TRANSFORM
+#include "../coro1-ret-int-yield-int.h"
+
+/* Valued with an await_transform.  */
+int gX = 1;
+
+coro1
+f ()
+{
+  for (;;)
+    {
+      gX += co_await 11;
+      if (gX > 100)
+        break;
+    }
+  co_return gX;
+}
+
+int main ()
+{
+  PRINT ("main: create coro1");
+  struct coro1 f_coro = f ();
+  PRINT ("main: got coro1 - checking gX");
+  if (gX != 1)
+    {
+      PRINTF ("main: gX is wrong : %d, should be 1\n", gX);
+      abort ();
+    }
+  PRINT ("main: gX OK -- looping");
+  do {
+    PRINTF ("main: gX : %d \n", gX);
+    f_coro.handle.resume();
+  } while (!f_coro.handle.done());
+
+  int y = f_coro.handle.promise().get_value();
+  // first value above 100 is 10*11 + 1.
+  if (y != 111)
+    {
+      PRINTF ("main: y is wrong : %d, should be 111\n", y);
+      abort ();
+    }
+  puts ("main: done");
+  return 0;
+}