Forwarding elements of an AsyncSequence into another AsyncStream

Using Swift
1

oftentimes, i find myself trying to “wrap” an AsyncSequence (usually, an AsyncStream) with another AsyncStream that i want to inject some additional events into. the outer stream should never outlive the inner stream.

var c:AsyncThrowingStream<Event, any Error>.Continuation? = nil
let s:AsyncThrowingStream<Event, any Error> = .init { c = $0 }
guard
let c:AsyncThrowingStream<Event, any Error>.Continuation
else
{
    fatalError("unreachable")
}

i end up writing something like:

async
let _:Void =
{
    do
    {
        for try await message:Message in $1
        {
            c.yield(.message(message))
        }
        $0.finish()
    }
    catch let error
    {
        $0.finish(throwing: error)
    }
} (c, messagesInbound)

but i could not find any examples of this pattern in the swift-async-algorithms package. is this a good idea, and if not, what should i be doing instead?