Module:No globals: Difference between revisions

← Older edit

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+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)