Hi,

the new Source.queue in Akka Stream 2.0-M1 offers an interesting way to 
imperatively push elements into the stream without loosing backpressure 
information, but how could the complete signal be sent to the source? 

In case of Source.actorRef it is possible by sending a PoisonPill or a 
Success/Failure message to the materialized actor ref, but when 
materializing a SourceQueue the only method that is exposed is offer() to 
push elements into the stream, adding a complete() and/or fail() method 
could solve the issue, or maybe there is some other way that is not yet 
documented (or I missed it).

Regards,
Francesco

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