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  1. -- example of for with generator functions
  2.  
  3. function generatefib (n)
  4.   return coroutine.wrap(function ()
  5.     local a,b = 1, 1
  6.     while a <= n do
  7.       coroutine.yield(a)
  8.       a, b = b, a+b
  9.     end
  10.   end)
  11. end
  12.  
  13. for i in generatefib(1000) do print(i) end
  14.