[luatex] Luatex primitive names

[Heiko Oberdiek]

On Wed, Mar 11, 2009 at 01:44:22PM +0100, Javier Múgica wrote:

> >The existence of a command doesn't say anything about its
> > version dependend syntax, semantics and version specific bugs.
> 
> Sorry, I meant why don't they test for the existence or the syntax of
> the command when that is possible (as in the example of \pdfstrcmp).

Yes, your example shows, that care is also necessary for
the version checks (not checking \pdfstrcmp, but \pdftexversion).
Also there may be other engines that provide the same feature as well,
e.g. \pdfsavepos is also supported by XeTeX.

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