User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0)
            Gecko/20100101 Thunderbird/31.7.0
MIME-Version: 1.0
References: <ofgd78x7j1kn.dlg@nililand.de>           
            <557AAB6A.2060109@morningstar2.co.uk>           
            <4x0uuwrujdy7$.dlg@nililand.de> <557B20F7.80503@morningstar2.co.uk>
            <1jaqm8itcvdpc$.dlg@nililand.de>
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: 7bit
Message-ID:  <557D3B52.5010807@morningstar2.co.uk>
Date:         Sun, 14 Jun 2015 09:29:06 +0100
Reply-To: Mailing list for the LaTeX3 project
              <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
Sender: Mailing list for the LaTeX3 project <LATEX-L@LISTSERV.UNI-HEIDELBERG.DE>
From: Joseph Wright <joseph.wright@MORNINGSTAR2.CO.UK>
Subject: Re: Error with \keys_if_choice_exist if the value is hidden in a macro
To: LATEX-L@LISTSERV.UNI-HEIDELBERG.DE
In-Reply-To:  <1jaqm8itcvdpc$.dlg@nililand.de>
Precedence: list
Envelope-To: <rainer.schoepf@GMX.NET>
Status: R

On 12/06/2015 21:49, Ulrike Fischer wrote:
> Am Fri, 12 Jun 2015 19:12:07 +0100 schrieb Joseph Wright:
> 
>> On 12/06/2015 11:58, Ulrike Fischer wrote:
> 
>>> That's a relieve. I was really very bewildered ;-)
>>
>> Glad I could help: is a release urgent?
> 
> No.  
>>
>>> Btw: I came across the problem because I was looking for a way to
>>> get 
>>>
>>>  \keys_set:nn { test } {type=\testvalue}
>>>
>>> working, if \testvalue expands to a known choice. Is there some good
>>> way to do it? 
>>>
>>> \exp_args:Nnx\keys_set:nn { test } {type=\testvalue}
>>>  
>>> works but could lead to problems if more keys are in the list. 
>>
>> Like other keyval systems, l3keys does no expansion of the key or value
>> when parsing: that's by-design.
> 
> I know ;-). But sometimes it would be useful to be able to set a
> choice or a boolean key through a tl or bool variable and not
> explicitly. 
> 
> Btw: This doesn't work either
> 
> \documentclass{article}
> \usepackage{expl3}
> \begin{document}
> \ExplSyntaxOn
> 
> \def\testvalueA{A}
> 
> \keys_define:nn {test}
>  {
>   type    .choices:nn = { A , B , \testvalueA }
>    {
>     blub
>    },
>  }
> 
> \keys_set:nn { test } {type=\testvalueA}
> 
> \ExplSyntaxOff
> %Error
> \end{document}
>  
> 

Problem identified: will also be fixed in an update (I'll send later today).
--
Joseph Wright