Index: skeleton.c
===================================================================
RCS file: /home/dcvs/src/usr.bin/yacc/skeleton.c,v
retrieving revision 1.6
diff -u -r1.6 skeleton.c
--- skeleton.c	22 Jan 2006 13:38:50 -0000	1.6
+++ skeleton.c	9 Jul 2008 22:09:51 -0000
@@ -313,6 +313,10 @@
     "                YYPREFIX, yystate, yyn, yyrule[yyn]);",
     "#endif",
     "    yym = yylen[yyn];",
+    "    if (yym)",
+    "        yyval = yyvsp[1-yym];",
+    "    else",
+    "        memset(&yyval, 0, sizeof yyval);",
     "    yyval = yyvsp[1-yym];",
     "    switch (yyn)",
     "    {",