ReactiveX/RxJava — pull request #1711 by mattrjacobs (2014-10-02 00:12:46+00:00)
Title: Demonstrate a regression in a special case exposed by Groovy

In 0.19.2, Observable.mergeDelayError(Observable.error(ex)) emits an OnError
In 0.20.4, Observable.mergeDelayError(Observable.error(ex)) emits nothing