Hello,

I am intrigued by the mechanisms in which errors/exceptions in the Future 
wrapped by Source.fromFutureSource are handled or if they can even be 
handled. Also, the type signature of the method is: 

def fromFutureSource[T, M](future: Future[Graph[SourceShape[T], M]]): Source[T, 
Future[M]]

I don't understand the return type: Source[T, Future[M]]. Can anyone 
explain why is the Future here? What is the use of the second type 
parameter of Source[T, M]? Which is usually NotUsed?

Thank you!!

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