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On Mon, 11 Jan 2010 17:08:06 +0200, Luiz Henrique de Figueiredo <> wrote:

But I'm feeling 98% sure "in nil do ... end" never will become valid Lua.

It is valid in 5.2 and it forces (at runtime) that the block does not
contain any references to global variables.

   Lua 5.2.0 (work1)  Copyright (C) 1994-2008, PUC-Rio
   > in nil do a=1 end
   stdin:1: attempt to index local '(environment)' (a nil value)

I was wrong, thanks for correcting.
It almost allows non-tables as the environment! Just tried:

local a = newproxy(true)
local print = print
getmetatable(a).__index = function (v, x) print(x) return "ret" end
in a do
  (function () print(key2) end) ();

Which outputs:

./src/lua: testen.lua:6: environment is not a table: cannot create closure

Kind of sad :(
Userdata works as environment in the 'in .. do .. end', which is great new feature,
but still doesn't work in closures...