isCanceled t
i1 : n = 0 o1 = 0
i2 : t = schedule(() -> while true do n = n + 1) o2 = <<task, created>> o2 : Task
i3 : sleep 1 o3 = 0
i4 : isCanceled t o4 = false
i5 : sleep 1 o5 = 0
i6 : cancelTask t
i7 : sleep 2 stdio:2:25:(3):[1]: error: interrupted o7 = 0
i8 : isCanceled t o8 = true