-- counter of `top`s until `reset` condition holds
node counting (tick: bool) returns (o: int);
var v: int;
let
  o = v -> (pre o) + v;
  v = if tick then 1 else 0
tel

node main (i: int) returns (o: int);
let
  -- 0 means no `top` and no `reset`
  -- 1 means `top`
  -- 2 means `reset`
  o = reset counting(i = 1) every (i = 2);
tel