--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/torture/co-ret-14-template-3.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,58 @@
+// { dg-do run }
+
+// Check type dependent function parms. 
+
+#include "../coro.h"
+
+// boiler-plate for tests of codegen
+// there is a promise ctor that takes a single int.
+#include "../coro1-ret-int-yield-int.h"
+
+template <typename T, typename U, typename V>
+coro1
+f (T x, U y, V z) noexcept
+{
+  PRINT ("coro1: about to return");
+  T xi = (T) y;
+  T yi = (T) z;
+  T zi = x;
+  co_return 3 + xi + yi + zi;
+}
+
+int main ()
+{
+  PRINT ("main: create coro1");
+  struct coro1 x = f<int, float, double>(2, 18.0F, 19.0);
+
+  /* We should be using the default promise ctor, which sets the value
+     to -1.  */
+  int y = x.handle.promise().get_value();
+  if ( y != -1 )
+    {
+      PRINT ("main: wrong promise init.");
+      abort ();
+    }
+
+  PRINT ("main: got coro1 - resuming");
+  if (x.handle.done())
+    abort();
+
+  x.handle.resume();
+  PRINT ("main: after resume (initial suspend)");
+
+  /* Now we should have the co_returned value.  */
+  y = x.handle.promise().get_value();
+  if ( y != 42 )
+    {
+      PRINT ("main: wrong answer.");
+      abort ();
+    }
+
+  if (!x.handle.done())
+    {
+      PRINT ("main: apparently not done...");
+      abort ();
+    }
+  PRINT ("main: returning");
+  return 0;
+}