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--<pre>Reduces chances of errors by preventing nil global variables from being written to or read
-- Syntax :  require('Module:No globals') on top of module
local mt = getmetatable(_G) or {}
 
function mt.__index (t, k)
	if k ~= 'arg' then
		error('Tried to read nil global ' .. tostring(k), 2)
	end
	return nil
end
 
function mt.__newindex(t, k, v)
	if k ~= 'arg' then
		error('Tried to write global ' .. tostring(k), 2)
	end
	rawset(t, k, v)
end
 
setmetatable(_G, mt)
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