Re: Forward declarations in modules

[Nick Gammon <nick@...>]

On 07/09/2006, at 1:19 PM, Mark Edgar wrote:

> the local statement creates a new local

This code is interesting:

-------
local a = 10

function f ()
  print (a)
end -- f

local a = 20

function g ()
  print (a)
end -- g

local a = 30

f ()  --> 10
g ()  --> 20
--------


It seems that there are actually 3 copies of "a" here, with different  
values. By the time I call f and g the most recent a is 30, however  
they seem to be "bound" to the local declarations earlier up.

How does Lua distinguish each "a" from each other? Judging by the  
earlier error message it makes them upvalues of the functions as it  
hits the function declarations.

- Nick