Start a new SourceTOut, TMat from the given TaskTResult. The stream will consist of one element when the TaskTResult is completed with a successful value, which may happen before or after materializing the IFlowTOut, TMat. The stream terminates with a failure if the task is completed with a failure.

public static Source<T, NotUsed> FromTask<T>(
	Task<T> task
)

static member FromTask : 
        task : Task<'T> -> Source<'T, NotUsed>