cancelTask(Task) -- stop a task

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 : t

o4 = <<task, running>>

o4 : Task

i5 : n

o5 = 647906

i6 : sleep 1

o6 = 0

i7 : t

o7 = <<task, running>>

o7 : Task

i8 : n

o8 = 1316349

i9 : isReady t

o9 = false

i10 : cancelTask t

i11 : sleep 2
stdio:2:25:(3):[1]: error: interrupted

o11 = 0

i12 : t

o12 = <<task, canceled>>

o12 : Task

i13 : n

o13 = 1316567

i14 : sleep 1

o14 = 0

i15 : n

o15 = 1316567

i16 : isReady t

o16 = false