import { Observable } from "rxjs/Observable";

declare const o: Observable<number>;

o.concat(Observable.of(1), Observable.of(2));
  ~~~~~~                                        [ban-operators % ("concat")]
o.merge(Observable.of(1), Observable.of(2));
  ~~~~~                                         [ban-operators % ("merge")]

[ban-operators]: RxJS operator is banned: %s