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Module:No globals: Difference between revisions

From ProleWiki, the proletarian encyclopedia
(Undid revision 948472525 by [[Special:Contributions/w>DiBabelYurikBot|w>DiBabelYurikBot]] ([[User talk:w>DiBabelYurikBot|talk]]))
 
m (3 revisions imported from commons:Module:No_globals: Introducing this template for use by me and other CU's)
Line 1: Line 1:
-- dummy comment
local mt = getmetatable(_G) or {}
local mt = getmetatable(_G) or {}
function mt.__index (t, k)
function mt.__index (t, k)

Revision as of 10:42, 21 May 2020

-- dummy comment
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)