`a.b.c.onFailure{ x => y }` seen in: https://github.com/akka/akka/blob/d01487778652d92bfe1edbf1eb7c53b4de04a2b0/akka-remote-tests/src/multi-jvm/scala/akka/remote/artery/aeron/AeronStreamConcistencySpec.scala#L123-L141
