Re: The purpose of LUA_ENVIRONINDEX pseudo index

["lists@..." <lists@...>]

> It depends whether you apply lua_setfenv to a Lua function or a C  
> function.  It has completely different meanings.
>
> applied to a Lua function it changes where that Lua function finds  
> global variables;
>
> applied to a C function it changes its LUA_ENVIRONINDEX table.  As  
> if lua_replace(L, LUA_ENVIRONINDEX) was called.  This has, of  
> course, got nothing to do with global variables (or environment in  
> the usual sense of the world).

OK - now I get why I was getting so confused from the example at

http://lua-users.org/lists/lua-l/2005-04/msg00213.html

There is a distinction between the environment of a function (what is  
using LUA_ENVIRONINDEX in the example), and the environment of a  
userdata (what is using lua_getfenv/lua_setfenv in the example).  The  
function environment is set when the library is loaded (from Lua  
using require "queue"), but the userdata enviroment is set in  
queue_new().  Nice.