Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!uw-june!ka
From: ka@june.cs.washington.edu (Kenneth Almquist)
Newsgroups: comp.unix.questions
Subject: Re: Yacc neophyte vs inscrutable error message
Message-ID: <7874@june.cs.washington.edu>
Date: 14 Apr 89 21:19:44 GMT
References: <255@sickkids.UUCP>
Organization: U of Washington, Computer Science, Seattle
Lines: 9

mark@sickkids.UUCP (Mark Bartelt) writes:
> [Message from YACC:]
>  fatal error: default action causes potential type clash, line xxx

When you omit an action, YACC supplies the default action {$$ = $1}.
You get the above message if $$ and $1 have different types.  The
line number may refer to the start of the rule following the rule that
is in error.
				Kenneth Almquist