--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/g++.dg/coroutines/torture/func-params-05.C	Thu Feb 13 11:34:05 2020 +0900
@@ -0,0 +1,57 @@
+//  { dg-do run }
+
+// Test that we can manage a constructed param reference
+
+#include "../coro.h"
+
+// boiler-plate for tests of codegen
+#include "../coro1-ret-int-yield-int.h"
+
+// Require a ctor.
+struct nontriv {
+  int a, b, c;
+  nontriv (int _a, int _b, int _c) : a(_a), b(_b), c(_c) {}
+  virtual int getA () { return a; }
+};
+
+struct coro1
+f (nontriv &t) noexcept
+{
+  if (t.a > 30)
+    {
+      PRINTF ("coro1: about to return %d", t.b);
+      co_return t.b;
+    }
+  else if (t.a > 20)
+    {
+      PRINTF ("coro1: about to co-return %d", t.c);
+      co_return t.c;
+    }
+  else
+    {
+      PRINT ("coro1: about to return 0");
+      co_return 0;
+    }
+}
+
+int main ()
+{
+  PRINT ("main: create coro1");
+  nontriv test (25, 6174, 42);
+  struct coro1 x = f (test);
+  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;
+}