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Re: Bison Files and Token Order
From: |
Joel E. Denny |
Subject: |
Re: Bison Files and Token Order |
Date: |
Mon, 21 Jan 2008 17:04:59 -0500 (EST) |
On Tue, 22 Jan 2008, tim wrote:
> That looks OK. It used to work (putting token numbers on %left/%right/%
> nonassoc), but bison has had a number of incompatible changes over past
> years.
Thanks for reporting this. Yep, Open Group says Yacc requires it, and it
looks like Bison has been missing it since 1.50.
> The user code also now has to be M4-friendly, otherwise large slabs of
> your code silently disappear or strange error messages appear, as I
> found.
I haven't encountered this in any recent releases. Please post an example
if the problem persists.
> The upcoming release also flags various (4) long-standing syntaxes as
> deprecated eg %pure-parser.
The old syntax is still supported. My guess is that it will be many years
before it's removed completely, if ever.
> a) Keep incompatible changes to the absolute minimum to reduce impact on
> downstream projects.
Of course, we try. Please continue to report problems as you find them.
Thanks for the feedback.