fn test_for_match() {
    mut a := 2
    mut b := 0
    for {
        match a {
            2 {
                println('a == 2')
                a = 0
                continue
            }
            0 {
                println('a == 0')
                a = 5
                b++
                break
            }
            else {
                println('unexpected branch')
                break
            }
        }
    }
    assert a == 5
    assert b == 1
}

fn test_for_select() {
    ch1 := chan int{}
    ch2 := chan f64{}
    spawn do_send(ch1, ch2)
    mut a := 0
    mut b := 0
    for select {
        x := <-ch1 {
            a += x
        }
        y := <-ch2 {
            a += int(y)
        }
    } {
        // count number of receive events
        b++
        println('${b}. event')
    }
    assert a == 10
    assert b == 3
}

fn do_send(ch1 chan int, ch2 chan f64) {
    ch1 <- 3
    ch2 <- 5.0
    ch2.close()
    ch1 <- 2
    ch1.close()
}