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Subject: bin/23254: yacc accepts bad grammer
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>Number:         23254
>Category:       bin
>Synopsis:       yacc accepts bad grammer
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Dec 03 16:50:02 PST 2000
>Closed-Date:
>Last-Modified:
>Originator:     Mark Andrews
>Release:        FreeBSD 4.2-RELEASE i386
>Organization:
Nominum
>Environment:

FreeBSD drugs.dv.isc.org 4.2-RELEASE FreeBSD 4.2-RELEASE #0: Fri Nov 24 00:33:35 EST 2000     marka@drugs.dv.isc.org:/usr/obj/usr/src/sys/DRUGS  i386

FreeBSD: src/usr.bin/yacc/skeleton.c,v 1.28 2000/01/17 02:04:06 bde Exp

>Description:

	Yacc does not fail on bad grammer.  This make FreeBSD a bad
	development platform as yacc's on other platforms do error
	on this bad grammer.

>How-To-Repeat:

	Add a ";" to the end of any non-terminal rule.  It should error
	but doesn't.

	The follow grammer fragment is bad.  The fragment has been taken
	from the BIND 8 source and modified to be bad by adding a semi-colon
	after T_FIRST.  Such a modification should cause yacc to error but
	it doesn't.

zone_forward_opt: T_ONLY
        {
                set_zone_boolean_option(current_zone, OPTION_FORWARD_ONLY, 1);
        }
        | T_FIRST ;
        {
                set_zone_boolean_option(current_zone, OPTION_FORWARD_ONLY, 0);
        }
        ;

>Fix:



>Release-Note:
>Audit-Trail:
>Unformatted:


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