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Re: Dubious features
From: |
Akim Demaille |
Subject: |
Re: Dubious features |
Date: |
Wed, 07 Jun 2006 12:00:37 +0200 |
User-agent: |
Gnus/5.110004 (No Gnus v0.4) Emacs/21.4 (gnu/linux) |
>>> "Joel" == Joel E Denny <address@hidden> writes:
> On Wed, 7 Jun 2006, Akim Demaille wrote:
>> always used this "feature" (which at the time was rather an exploit
>> from a loophole in the parser) with a single id: the name I wanted to
>> give to the union.
> Is there a difference between that and a subsequent typedef YYSTYPE id in
> a literal block?
I don't recall the exact details, but yes, at that time there was a
difference. It might well be that there was no typedef, but just a
#define, I don't remember.
Still, I agree today it makes no sense.
>> As for the first point, I had received complaints from users who
>> disliked the fact that they faced errors with yacc: they wanted bison
>> to be more yackish.
> POSIX specifies this? I didn't find it, but it's like searching for a
> needle in a haystack. Or is this just a common convention in yacc
> implementations? I can't imagine the original point of it.
You might have read it backwards: POSIX probably asks nothing about
this semi-colon. But Bison used to add such a semi-colon, and
therefore its users could produce invalid code with other Yaccs. So
as a feature, Bison adds this `;' only if ! yacc_flag. I'm proposing
to never ever add it.
Re: Dubious features, Paul Eggert, 2006/06/07
- Re: Dubious features, Akim Demaille, 2006/06/08
- Re: Dubious features, Paul Eggert, 2006/06/08
- Re: Dubious features, Akim Demaille, 2006/06/08
- Re: Dubious features, Akim Demaille, 2006/06/08
- Re: Dubious features, Paul Eggert, 2006/06/08
- Re: Dubious features, Akim Demaille, 2006/06/08