[Fontinst] eTeX and fontinst -- incompatible?

Walter Schmidt w.a.schmidt at gmx.net
Tue Dec 9 01:20:32 CET 2003

Please, let me forward a message from Heiko Oberdiek
<oberdiek at uni-freiburg.de>, who has probably found out
what is wrong here.   


==================BEGIN FORWARDED MESSAGE==================
>From: Heiko Oberdiek <oberdiek at uni-freiburg.de>
>Subject: Re: [VTeX] eTeX fails on fontinst
>Message-ID: <20031208235040.GA1278 at linux>

It is an error in fontinst.sty's e-TeX support code:

line 24 of the .mtx file contains:
This executes \ifisint{rawscale}, it checks

  \ifisint #1\then ->\if_defined i-#1\then 

  \if_defined #1\then ->\ifcsname #1\endcsname 
  {\ifcsname: (level 5) entered on line 24}

This evaluates to true, because \i-rawscale was assigned
previously by \unsetint{rawscale}, it executes:

\ifcsname also evaluates to true, if the command name has the
meaning of relax. 

In the TeX case, without e-TeX extensions, \if_defined is
defined as (\let\x_relax=\relax):

     \expandafter\ifx \csname#1\endcsname\x_relax

Here the test evaluates to false, if the command name exists,
but has the meaning of \relax.

Yours sincerely
  Heiko <oberdiek at uni-freiburg.de>

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