Re: Handling deprecated features..?

[Uli Kusterer <witness.of.teachtext@...>]

On Aug 5, 2005, at 3:14:14, Mike Pall wrote:
> Python has a fairly elaborate scheme with forwards and backwards
> compatibility, deprecation warnings and 'from __future__ import'
> and whatnot. Well, you may ask ... what's wrong with it?
> (...)
> Well, there's a chicken-and-egg problem with this one. The parser
> bails out before you can run the chunk to tell the parser that
> it shouldn't (and a global flag doesn't cut it).

 Doesn't Lua effectively do weak-linking? I.e. couldn't one just  
compare the function name against NIL? An undeclared global in Lua is  
NIL, after all. So, if you're running a pre-compatibility-check  
version of Lua, you have compatmode5_0 being NIL. Otherwise, you can  
call it to actually query the particular feature, can't you?

Cheers,
-- M. Uli Kusterer
http://www.zathras.de