package main
import (
"fmt"
)
type CountFunc func() int
func MakeCounter(starting_at int) CountFunc {
counter := func() int {
starting_at++
return starting_at
}
return counter
}
func main() {
from_ten := MakeCounter(10)
for i := 10; i < 20; i = from_ten() {
fmt.Println(i)
}
}