package main

import "fmt"

func fib(ch chan<- int) {
    x, y := 0, 1
    
    // infinite loop
    for { 
        ch <- x
        x, y = y, x+y
    }
}

func main() {
    ch := make(chan int)
    go fib(ch)    
    for i := 0; i < 10; i++ {
        fmt.Println(<-ch)
    }    
}