new Promise(resolve => resolve())
  .then(() => {
    return new Promise((undefined, reject) => {
      reject(new Promise((resolve) => {
        resolve('success!');
      }));
    });
  })
  // the function passed to this then is never called
  .then((result) => {
    console.log(result);
  })
  .catch((error) => {
    // error is actually a promise!
    error.then((result) => {
      // logs success!
      console.log(result);
    });
  });