Re: [Enigma-devel] Port of r99 to Lua 5.1

[Tacvek]

----- Original Message ----- 
From: "Daniel Heck" <address@hidden>
To: <address@hidden>
Sent: Friday, March 31, 2006 2:07 PM
Subject: Re: [Enigma-devel] Port of r99 to Lua 5.1

> > The main challenge is to update all the scripts that use %upvalues, and
> > anyhting
> > else that does not happen to work with lua5.
>
> Maybe I'm mistaken, but I thought upvalues were abandoned in favor of
> full lexical scoping in Lua 5.  In this case, wouldn't the problem be
> solved by simply %variable with variable everywhere?

Well There are a few problems.
If there is any code that depends on "%upvalue" refering to the value as it 
was when the fnction was defined rather than the current value, then a 
slight workaround is needed.

The workaround needed is described in: 
http://lua-users.org/lists/lua-l/2005-11/msg00314.html

Also there is the case of things like:
> Local y
> ...
> y=%y

If this is used anywhere a different workaround would be nessisary.

The other incompatabilites mentioned in the "Incompatibilities with Previous 
Versions" sections of the 5.0 and 5.1 manuals
also apply.