--- sv.c.org	2004-07-12 23:44:41.000000000 +0200
+++ sv.c	2004-10-03 16:56:34.000000000 +0200
@@ -3001,2 +3001,3 @@
 	    SV* tmpstr;
+	    Perl_croak(aTHX_ "Stringification of reference disallowed");
             if (SvAMAGIC(sv) && (tmpstr=AMG_CALLun(sv,string)) &&