--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/torture/lambda-03-auto-parm-1.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,46 @@
+//  { dg-do run }
+
+// generic Lambda with auto parm (c++14)
+
+#include "../coro.h"
+
+// boiler-plate for tests of codegen
+#define USE_AWAIT_TRANSFORM
+#include "../coro1-ret-int-yield-int.h"
+
+int main ()
+{
+  auto f = [](auto y) -> coro1
+  {
+    PRINT ("coro1: about to return");
+    auto x = y;
+    co_return co_await x + 3;
+  };
+
+  PRINT ("main: create coro1");
+  struct coro1 x = f((int)17);
+  if (x.handle.done())
+    abort();
+
+  x.handle.resume();
+  PRINT ("main: after resume (initial suspend)");
+
+  x.handle.resume();
+  PRINT ("main: after resume (co_await)");
+
+  /* Now we should have the co_returned value.  */
+  int y = x.handle.promise().get_value();
+  if ( y != 20 )
+    {
+      PRINTF ("main: wrong result (%d).", y);
+      abort ();
+    }
+
+  if (!x.handle.done())
+    {
+      PRINT ("main: apparently not done...");
+      abort ();
+    }
+  PRINT ("main: returning");
+  return 0;
+}