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- -- example of for with generator functions 
-   
- function generatefib (n) 
-   return coroutine.wrap(function () 
-     local a,b = 1, 1 
-     while a <= n do 
-       coroutine.yield(a) 
-       a, b = b, a+b 
-     end 
-   end) 
- end 
-   
- for i in generatefib(1000) do print(i) end 
-