Date: Thu, 27 Jul 2000 01:50:02 -0700 (PDT) From: Bertho Stultiens <bertho@panter.soci.aau.dk> To: freebsd-bugs@FreeBSD.org Subject: Re: misc/20172: byacc 1.9 fails to generate $default transitions for non-terminals Message-ID: <200007270850.BAA66540@freefall.freebsd.org>
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The following reply was made to PR misc/20172; it has been noted by GNATS.
From: Bertho Stultiens <bertho@panter.soci.aau.dk>
To: freebsd-gnats-submit@FreeBSD.org, bertho@j.auh.dk
Cc:
Subject: Re: misc/20172: byacc 1.9 fails to generate $default transitions for
non-terminals
Date: Thu, 27 Jul 2000 10:48:31 +0200
Two comments:
1) The example should use a slightly different action for one rule to
make it more clear what happens. The yyclearin should eliminate the
lookahead and then all should continue as planned. However, byacc will
generate a syntax error on the input. Here is the rule as intended:
line: tTOK xpr ',' xpr {
if(yychar == tNL) {
printf("Success: Got tNL\n");
yyclearin;
}
}
2) After some email exchange with the original author it has become
apparent that he does not seem to consider the problem a bug. This means
that it is likely that byacc will be unusable for all heavy yacc-parsers
that manipulate lookahead tokens in an above fassion.
Greetings Bertho
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