Modul:No globals

---

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local mt = getmetatable(_G) or {}
function mt.__index (t, k)
	if k ~= 'arg' then
		error('Pokušao sam čitati nil globalne ' .. tostring(k), 2)
	end
	return nil
end
function mt.__newindex(t, k, v)
	if k ~= 'arg' then
		error('Pokušao sam upisati u globalnu ' .. tostring(k), 2)
	end
	rawset(t, k, v)
end
setmetatable(_G, mt)