Re: 5.2 and 5.1

[Philipp Janda <siffiejoe@...>]

Am 16.04.2013 04:36 schröbte Miles Bader:
> Philipp Janda <siffiejoe@gmx.net> writes:
> >    if _VERSION == "Lua 5.1" then
> >      setfenv( f, env )
> >    end
>
> BTW, it seems much cleaner to just do:
>
>     if setfenv then setfenv (f, env) end

Yes, but (related to another thread) I do

local setfenv = setfenv
if _VERSION == "Lua 5.1" then
  assert( setfenv )
end

at the top of the file anyway, and some people have written 
setfenv[1][2][3] for Lua 5.2 and I feared that one of those functions 
could end up in the global environment, or -- even worse -- that someone 
wrote a completely unrelated function with that name, since the name 
setfenv is fair game now in Lua 5.2.

  [1]: https://github.com/davidm/lua-compat-env
  [2]: 
https://github.com/stevedonovan/Penlight/blob/master/lua/pl/utils.lua
  [3]: http://lua-users.org/lists/lua-l/2010-06/msg00313.html

> -miles

Philipp