ref: e1e358ec2c84ac0e6cecf5b1a91e583d9a1b0860
dir: /lua/test/readonly.lua/
-- 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'