const {ecall} = import('vm')

let s = ''

fun sleep_append(x) {
    spawn(||{
        ecall(@sleep,x)
        s='\(s):\(x)'
    })
}

sleep_append(500)
sleep_append(100)
sleep_append(200)

ecall(@sleep,600)
if s!=':100:200:500' {
    throw new Error("Expect s to be ':100:200:500',got '\(s)' instead")
}