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readonly.lua
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-- make global variables readonly local f=function (t,i) error("cannot redefine global variable `"..i.."'",2) end local g={} local G=getfenv() setmetatable(g,{__index=G,__newindex=f}) setfenv(1,g) -- an example rawset(g,"x",3) x=2 y=1 -- cannot redefine `y'