global declarations?

[Adriano <ferreira@...>]

I've read the following text on LuaFiveFeatures at www.lua-users.org wiki:

> - declaration of globals: we introduced global declarations:
> global a,b,c
> global a,b,c in T
> global in T        -- change the default
> So, "global in nil" forces declarations for every variable;
> "global in {}" puts all undeclared variables into a private table;
> "global sin, cos in math" allows the unqualified use of the
> names "sin" and "cos".

Apparently this has not gone into Lua 5.0. The interpreter
complains as "global"  was not a keyword (which is not according
to the reference manual). Have these features been postponed?
Is there some workaround in the current Lua version for these 
functionalities?

Regards, Adriano.

--
Adriano