Observable set works from other computed

[luwes]

This is currently not working

  var banana = o();
  var count = 0;
  S(() => {
    count++;
    return banana() + ' shake';
  });
  t.equal(count, 1);

  var carrot = o();
  S(() => {
    console.log('banana false');
    banana(false);

    carrot() + ' soup';

    console.log('banana true');
    banana(true);
  });

  carrot('carrot');
  t.equal(count, 5);