GNU bug report logs - #49624
compilation message end-column function off-by-one bug

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 49624 <at> debbugs.gnu.org, monnier <at> iro.umontreal.ca, juri <at> linkov.net
Subject: bug#49624: compilation message end-column function off-by-one bug
Date: Sun, 18 Jul 2021 22:10:05 +0300

> From: Mattias Engdegård <mattiase <at> acm.org>
> Date: Sun, 18 Jul 2021 21:00:41 +0200
> Cc: Stefan Monnier <monnier <at> iro.umontreal.ca>, Juri Linkov <juri <at> linkov.net>
> 
> Compilation message patterns (in compilation-regexp-alist and -alist) can indicate starting and ending line and column numbers, either by supplying regexp match numbers or functions that return the respective line/column numbers when called. In other words, the integer N can be understood as a shorthand for the function
> 
> (lambda () (and (match-beginning N) (string-to-number (match-string N))))
> 
> except that isn't true for the ending column where there is a difference of 1; an END-COL function returning 13 means that the error's last column is 12.

Isn't that because END-COL is the first column _beyond_ the last
column?

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