From mboxrd@z Thu Jan  1 00:00:00 1970
Message-Id: <200201182228.g0IMSVk25615@orthanc.ab.ca>
To: 9fans@cse.psu.edu
From: Lyndon Nerenberg <lyndon@orthanc.ab.ca>
Subject: [9fans] lex witchcraft
Date: Fri, 18 Jan 2002 15:28:31 -0700
Topicbox-Message-UUID: 3e9eadf2-eaca-11e9-9e20-41e7f4b1d025

/sys/src/cmd/grap/grapl.lx contains the fragment

        if (yybgin-yysvec-1 == 0) {     /* witchcraft */
                BEGIN A;
        }

What is this doing? (pic does this as well.)

--lyndon