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Message-ID:  <4D7515F9.6080300@morningstar2.co.uk>
Date:         Mon, 7 Mar 2011 17:29:29 +0000
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From: Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Re: Bug in \tl_replace_in:Nnn and friends
To: LATEX-L@listserv.uni-heidelberg.de
In-Reply-To:  <AANLkTinmM6Kwd42k-CZHdHwCwR_hFFVqDDse8R03tt_s@mail.gmail.com>
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Status: R

On 07/03/2011 17:18, Bruno Le Floch wrote:
> Hello,
> 
> I'm not sure whether this is the right place to send a bug report on
> l3tl. The following code causes a runaway argument. I didn't look yet
> at the implementation, but if needed, I can propose a bug fix some
> time this week.
> 
> \RequirePackage{expl3}
> \ExplSyntaxOn
> \tl_new:Nn \g_my_tl {aabono}
> \tl_replace_in:Nnn \g_my_tl {bonobo} {whatever}
> 
> Basically what happens is that the string we are looking for is put
> directly after the `\g_my_tl`, forming `bonobo`. This `bonobo` is
> replaced, and then the termination tries to remove the extra
> `bonobo\q_stop` which was added. This fails. The only way out is
> apparently to use two markers. It has been done a couple of times
> before (stringstring, perhaps?), so I just need to hunt for the
> reference.
> 
> aabono -> aabonobonobo\q_stop -> aawhatevernobo\q_stop -> BOOM!

Hello Bruno,

Thanks for the bug report. I'll aim to fix it in the SVN today, and then
do a CTAN release.
-- 
Joseph Wright