--- sv.c.org	2004-07-12 23:44:41.000000000 +0200
+++ sv.c	2004-10-03 16:54:08.000000000 +0200
@@ -3126,2 +3126,3 @@
 		}
+		Perl_croak(aTHX_ "Stringification of reference disallowed");
 		tsv = NEWSV(0,0);