On 2010-07-22 09:12:14 +0930, Grzegorz Murzynowski
<nat...@o2.pl> said:
I noted quite unexpectedly that nesting \csname…\endcsname, results in
turning |\ifincsname| false: the example above typesets
\before nested csname: In csname \ after nested csname: Not in csname
Is it a bug or a feature? (I use nested csnames sometimes).
The same behaviour occurs in pdfTeX, so from that respect at least it's
consistent. But it definitely looks like a bug to me.
Perhaps a clarifying example:
\def\a{\ifincsname T \else F \fi}
\expandafter\string\csname
1\a
\expandafter\string\csname2\a\endcsname
3\a
\endcsname
#1 and #2 and "true" but #3 is "false". Clearly the \endcsname has
reset the "am i in a csname" switch rather than popped it back to its
previous value.
I think it would be worth sending this to the pdfTeX mailing list as well.
Cheers,
Will
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