ref: 0b59aa78052f27a0288180fad73c507e827ee879
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'