function allSettled(entries, label) {
  if (!Array.isArray(entries)) {
    return Promise.reject(new TypeError("Promise.allSettled must be called with an array"), label);
  }

  return new AllSettled(Promise, entries, label).promise;
}
`RSVP.allSettled` is similar to `RSVP.all`, but instead of implementing
  a fail-fast method, it waits until all the promises have returned and
  shows you all the results. This is useful if you want to handle multiple
  promises' failure states together as a set.

  Returns a promise that is fulfilled when all the given promises have been
  settled. The return promise is fulfilled with an array of the states of
  the promises passed into the `promises` array argument.

  Each state object will either indicate fulfillment or rejection, and
  provide the corresponding value or reason. The states will take one of
  the following formats:

  ```javascript
  { state: 'fulfilled', value: value }
    or
  { state: 'rejected', reason: reason }
  ```

  Example:

  ```javascript
  let promise1 = RSVP.Promise.resolve(1);
  let promise2 = RSVP.Promise.reject(new Error('2'));
  let promise3 = RSVP.Promise.reject(new Error('3'));
  let promises = [ promise1, promise2, promise3 ];

  RSVP.allSettled(promises).then(function(array){
    // array == [
    //   { state: 'fulfilled', value: 1 },
    //   { state: 'rejected', reason: Error },
    //   { state: 'rejected', reason: Error }
    // ]
    // Note that for the second item, reason.message will be '2', and for the
    // third item, reason.message will be '3'.
  }, function(error) {
    // Not run. (This block would only be called if allSettled had failed,
    // for instance if passed an incorrect argument type.)
  });
  ```

  @method allSettled
  @public
  @static
  @for rsvp
  @param {Array} entries
  @param {String} [label] - optional string that describes the promise.
  Useful for tooling.
  @return {Promise} promise that is fulfilled with an array of the settled
  states of the constituent promises.