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  1. -- make global variables readonly
  2.  
  3. local f=function (t,i) error("cannot redefine global variable `"..i.."'",2) end
  4. local g={}
  5. local G=getfenv()
  6. setmetatable(g,{__index=G,__newindex=f})
  7. setfenv(1,g)
  8.  
  9. -- an example
  10. rawset(g,"x",3)
  11. x=2
  12. y=1     -- cannot redefine `y'
  13.