Difference between revisions of "Module:No globals"

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meta>Peteforsyth
m (5 revisions imported from w:Module:No_globals: Attempting, per request from User:Titodutta. I'm not sure if "w" is the right source wiki (only a few options in drop-down menu))
meta>Legoktm
(Fixing content model)
(No difference)

Revision as of 23:31, 29 July 2015

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)