pw: channel: always impl Clone for Sender
derive(Clone) would not impl Clone for Sender<T> where T is not Clone, despite Sender<T> holds only Arc and is safely cloneable.
So just manually impl Clone for Sender.
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derive(Clone) would not impl Clone for Sender<T> where T is not Clone, despite Sender<T> holds only Arc and is safely cloneable.
So just manually impl Clone for Sender.