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Date:         Fri, 22 Jan 2010 17:40:34 +0100
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From: Philipp Stephani <st_philipp@YAHOO.DE>
Subject: Re: Collision between mathtools.sty and expl3
To: LATEX-L@listserv.uni-heidelberg.de
In-Reply-To:  <4B59C295.80408@morningstar2.co.uk>
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Status: R

Am 22.01.2010 um 16:21 schrieb Joseph Wright:

> On 22/01/2010 15:13, Frank Mittelbach wrote:
>> if the two would work together by just using \cs_set_eq:NN for the moment then
>> as a short measure we could do that until mhsetup gets sorted out. However, it
>> might be the case that more is needed given that the mhsetup code is only
>> "based on" expl3 concepts but was used to run standalone and was developed
>> when expl3 was in an earlier stage.
>> 
>> as Joseph said, we should sort it out one way or the other soon.
> 
> A fix at the mhsetup end seems to be to move the definitions to \AtBeginDocument:
> 
> \AtBeginDocument{
>  \@ifundefined{if_num:w}{\MH_let:NwN \if_num:w =\ifnum}{}
>  \@ifundefined{if_dim:w}{\MH_let:NwN \if_dim:w =\ifdim}{}
>  \@ifundefined{if_case:w}{\MH_let:NwN \if_case:w =\ifcase}{}
>  \@ifundefined{or:}{\MH_let:NwN \or:=\or}{}
> }
> 
> (lines 93 onward).
> 
> Philipp, can you test this works in the "real world": if so something can go to CTAN today.

Yes, this seems to work fine.  Thanks.