const dt: real = 0.1;

node integrator(first: real; v: real; dt: real) returns (probe i: real)
let
  i = (first -> pre i) + (dt * v);
tel

node test(i: int) returns (a, b, c: int; exit: bool)
var
  probe cos, probe cosprime: real;
let
  cosprime = integrator(1.0, 0. -> pre (-cos), dt);
  cos = integrator(0., cosprime, dt);
  a = int(cos * 1000.);
  b = int(cosprime * 1000.);
  c = int(-cos * 1000.);
  exit = (i > 1000);
tel