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Sender: Mailing list for the LaTeX3 project <[log in to unmask]>
Date: Sun, 29 Jan 2012 08:35:03 -0500
Reply-To: Mailing list for the LaTeX3 project <[log in to unmask]>
Subject: Re: Unexpandability inside \csname
MIME-Version: 1.0
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From: Bruno Le Floch <[log in to unmask]>
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>> Perhaps you meant
>>
>>   \csname\ifnum 3>2\fi\endcsname
>>
>> which indeeds does \csname\relax\endcsname, an error.
>
> We should be fine here in expl3, I think, as internally we have
> something like
>
>   \csname\ifnum\numexpr3\relax>\numexpr2\relax\fi\endcsname
>
> in this scenario, and that is fine.

Precisely. If there were stray "implicit \relax", then they would
appear in x-expansion as well.

Bruno

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