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From: Gale Paeper
Subject: Just a little gripe about syntax changes
Date: 15 Sep 2003, 15:00:47

Wood David wrote:
[snip]
>  Having
> now done the upgrade to 20030830, I started getting errors due to duplicated
> unit declarations in the INTERFACE and IMPLEMENTATION blocks (for what
> reason?).  

The reason for the change was, I think, to fix a bug in GPC's handling
of Extended Pascal's requirement in paragraph 6.2.2.12, "Each
defining-point that has as a region a module-heading shall also have as
a region the module-block that is associated with that module-heading."

The bug was discussed a few months ago under the subject `EP question
(was: gpc-20030507 -'.

If I'm not mistaken, GPC treats unit INTERFACE and IMPLEMENTATION blocks
in a manner similar to module-headings and module-blocks so a bug-fix
for modules ends up "fixing" units also. 
 
> Whilst I'm getting very good at rebuilding gpc, I would hope future gpc
> releases will focus on bug-fixes and ensuring backward compiler
> compatibility, thus removing the need to match our software to a precise
> compiler version.

Sometimes bug-fixes and ensuring backward compiler compatibility are
mutually exclusive goals which is probably the case with your duplicated
unit declarations difficulties.

Gale Paeper
gpaeper@empirenet.com

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