[texhax] Unexisting commands.

[Joseph Wright]

On 14/04/2010 12:33, Paul Isambert wrote:
> Dear all,
>
> I've stumbled on the following problem. Heiko Oberdiek uses
>
> \expandafter\ifx\csname ProvidesPackage\endcsname\relax
>
> in his ifluatex package,

However, this is done in such a way that \ProvidesPackage does not get 
defined. For example, if you try

\input ifluatex.sty
\show\ProvidesPackage
\bye

you will see that \ProvidesPackage remains safely undefined. Can you 
provide a full example showing the problem?
--
Joseph Wright