Re: [ANN] Lua 5.2.0 (work4) now available

[Roberto Ierusalimschy <roberto@...>]

> On Sat, Aug 7, 2010 at 9:50 AM, Petri Häkkinen <petrih3@gmail.com> wrote:
> > On 7.8.2010, at 6.10, Mark Hamburg <mark@grubmah.com> wrote:
> >> This hardly seems particularly bizarre and it doesn't rely on tricks with
> >> environment to change global assignments into exported values.
> >>
> > Indeed. Honestly this should become the recommended practice or the new
> > 'policy', if you will. It's as explicit and simple as it gets.
> 
> Yes, much easier to explain to a newcomer.  _We_ may get module() but
> it's a subtle sideways beast, with pitfalls as pointed out by David M.
>  (We also tend to forget our initial puzzlement with module())
> 
> Also, it is invariant with respect to the 5.1 -> 5.2 transformation ;)

Just recently I rewrote the 're' module in LPEG to be invariant with
respect to the 5.1->5.2 transformation. I used a slightly different
technique. I declared everything local and only in the end I exported
what I wanted:

   local function foo1 ...
   local function foo2 ...
   local function foo3 ...
   ...
   return {
     foo1 = foo1,
     foo3 = foo3,
   }

-- Roberto