1*21d3294cSantirez-- make global variables readonly 2*21d3294cSantirez 3*21d3294cSantirezlocal f=function (t,i) error("cannot redefine global variable `"..i.."'",2) end 4*21d3294cSantirezlocal g={} 5*21d3294cSantirezlocal G=getfenv() 6*21d3294cSantirezsetmetatable(g,{__index=G,__newindex=f}) 7*21d3294cSantirezsetfenv(1,g) 8*21d3294cSantirez 9*21d3294cSantirez-- an example 10*21d3294cSantirezrawset(g,"x",3) 11*21d3294cSantirezx=2 12*21d3294cSantirezy=1 -- cannot redefine `y' 13