Re: [Proposal?] Environment stacks

["Thiago L." <fakedme@...>]

On 30/11/14 10:06 PM, Luiz Henrique de Figueiredo wrote:
> > what if environments had stacks?
> We already have that. No need for a keyword.
>
> 	x=1
> 	print(x)
> 	do
> 		local _ENV={print=print}
> 		x=2
> 		print(x)
> 		do
> 			local _ENV={print=print}
> 			x=3
> 			print(x)
> 		end
> 		print(x)
> 	end
> 	print(x)
>
> The _ENV mechanism was created exactly to allow this kind of thing
> without resorting to magic.
Issues:

function() return ("").sub end -- Issue number 1: How am I supposed to 
get an environment out of this thing from the string metatable? (seeing 
as there's no _ENV and no way to access the env of the scope that 
created this function)

do
  local type = type
  local _ENV = {print=print, tostring = function(i) if type(i) == 
"string" then return ("%q"):format(i) end return ("%s"):format(i) end}
  print("Issue number 2: Uh oh! This doesn't get serialized!")
end

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