ref: 3fa0b14620e9c84c1fac5eb6e70b5db93b2bf4af
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'