Module:No globals: Difference between revisions

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m Changed protection settings for "Module:No globals" ([Edit=Allow only bureaucrats] (indefinite) [Move=Allow only stewards] (indefinite) [Delete=Allow only stewards] (indefinite) [Protect=Allow only stewards] (indefinite))
m 1 revision imported: may be useful
 
(No difference)

Latest revision as of 19:05, 6 October 2024

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

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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