How to use the @effectful/es.yldStarMB function in @effectful/es

function v_2(v_v, loop) {
  var a, b;
  b = loop.step();
  a = loop = b;
  if (!a.done) return v_3(v_v, loop);else {
    return G.yldStarMB(z, v_4);
  }
}

function v_2(j, loop) {
  var a, b;
  b = loop.step();
  a = loop = b;
  if (!a.done) return v_3(j, loop);else {
    return G.yldStarMB(z, v_4);
  }
}

function ag3_11(i, j, loop) {
  var a;
  a = eff(2, j);
  return G.yldStarMB(a, ag3_12, loop);
}

function ag3_11(a, ag3_v, _ag3_v, loop) {
  var b;
  ag3_v.i = a;
  b = eff(2, _ag3_v.j);
  return G.yldStarMB(b, ag3_12, ag3_v, _ag3_v, loop);
}

function f_3() {
  var a;
  a = eff(3);
  return G.yldStarMB(a, f_4);
}

function f_3() {
  var a;
  a = eff(3);
  return G.yldStarMB(a, f_4);
}

function e_2() {
  return G.yldStarMB(x, e_3);
}

function e_2() {
  return G.yldStarMB(x, e_3);
}