import time

fn fibonacci(c chan int, quit chan int) {
    println('fibonacci')
    mut x, mut y := 0, 1

    for {
        select {
            c <- x {
                println('send')
                x, y = y, x + y
            }
            _ = <-quit {
                println('quit')
                return
            }
            2 * time.second {
                println('timeout')
                return
            }
        }
    }
}

fn main() {
    ch := chan int{}
    quit := chan int{}

    spawn fn [ch, quit] () {
        for _ in 0 .. 5 {
            println('pop')
            println(<-ch)
        }
        println('quit')
        quit <- 0
    }()

    fibonacci(ch, quit)
}