--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/torture/lambda-08-co-ret-parm-ref.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,59 @@
+//  { dg-do run }
+
+// Test that we can use a function param in a co_xxxx status.
+
+#include "../coro.h"
+
+// boiler-plate for tests of codegen
+#include "../coro1-ret-int-yield-int.h"
+
+int main ()
+{
+  int val;
+
+  auto f = [&] (int x) -> coro1
+  {
+    if (val + x > 25)
+      {
+        PRINT ("coro1: about to return k");
+        co_return 6174;
+      }
+    else if (val + x > 20)
+      {
+        PRINTF ("coro1: about to co-return %d\n", val + x);
+        co_return val + x;
+      }
+    else if (val + x > 5)
+      {
+        PRINTF ("coro1: about to co-return %d\n", val);
+        co_return val;
+      }
+    else
+      {
+        PRINT ("coro1: about to return 0");
+        co_return 0;
+      }
+  };
+
+  PRINT ("main: create coro1");
+
+  val = 20;  // We should get this by ref.
+  int arg = 5; // and this as a regular parm.
+
+  coro1 x = f (arg);
+  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 != 25 )
+    abort ();
+  if (!x.handle.done())
+    {
+      PRINT ("main: apparently not done...");
+      abort ();
+    }
+  PRINT ("main: returning");
+  return 0;
+}