package main

import "fmt"

func fibonacci(s1, s2 int) func() int {
   fmt.Println("start with:", s1, s2)
   left := s1
   right := s2
   return func() int {
      nest := left + right
      left = right
      right = nest
      return nest
   }
}
func main() {
   f := fibonacci(0, 1)
   for i := 0; i < 10; i++ {
      fmt.Println(f())
   }
}

 

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