Minetest: globalchecker

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local mt = getmetatable(_G)
if not mt then
    mt = { }
    setmetatable(_G, mt)
end

function mt:__newindex(key, value)
    local i = debug.getinfo(2)
    print(("[globalchecker] new global %s at %s:%d"):format(key, i.source, i.currentline))
    rawset(self, key, value)
end

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