Modulus:No globals

Documentation for this module may be created at Modulus:No globals/doc

local mt = getmetatable(_G) or {}
function mt.__index (t, k)
	if k ~= 'arg' then
		error('Attempt to read empty global variable ' .. tostring(k), 2)
	end
	return nil
end
function mt.__newindex(t, k, v)
	if k ~= 'arg' then
		error('Attempt to read empty global variable ' .. tostring(k), 2)
	end
	rawset(t, k, v)
end
setmetatable(_G, mt)