--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/torture/lambda-01-co-ret-parm.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,48 @@
+//  { dg-do run }
+
+// Lambda with parm
+
+#include "../coro.h"
+
+// boiler-plate for tests of codegen
+#include "../coro1-ret-int-yield-int.h"
+
+int main ()
+{
+  auto f = [](int x) -> coro1
+  {
+    if (x > 30)
+     {
+	PRINT ("coro1: about to return k");
+	co_return 6174;
+     }
+    else if (x > 20)
+     {
+	PRINT ("coro1: about to return the answer");
+	co_return 42;
+     }
+    else
+     {
+	PRINT ("coro1: about to return 0");
+	co_return 0;
+     }
+  };
+
+  PRINT ("main: create coro1");
+  coro1 x = f (25);
+  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 != 42 )
+    abort ();
+  if (!x.handle.done())
+    {
+      PRINT ("main: apparently not done...");
+      abort ();
+    }
+  PRINT ("main: returning");
+  return 0;
+}