Fix Subscription cancelation when never awaiting
#1349
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`StreamExt::forward` will keep polling a ready `Stream` in a loop. If the `Stream` is always ready, the `poll` method of `Forward` effectively blocks (see rust-lang/futures-rs#2552). The fix consists in manually implementing a simpler version of `Forward`.
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Fix `Subscription` cancelation when never awaiting
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StreamExt::forwardwill keep polling a readyStreamin a loop. If theStreamis always ready, thepollmethod ofForwardeffectively blocks (see rust-lang/futures-rs#2552).The fix consists in manually implementing a simpler version of
Forward.Fixes #1348.