[luatex] Luatex primitive names

[Heiko Oberdiek]

On Wed, Mar 11, 2009 at 01:16:27PM +0100, Javier Múgica wrote:

> But I don't understand why package writters insist on testing for the
> version instead of testing for the existence of the command they want
> to use.

* With next LuaTeX, the command (except \directlua) is still there,
  but its name is unknown. Therefore the test for the existence fails.
* The existence of a command doesn't say anything about its
  version dependend syntax, semantics and version specific bugs.

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