What does "__consuming" do in Swift? : <p>There are functions prepended with <code>__consuming</code> in <a href="https://github.com/apple/swift/blob/master/stdlib/public/core/Sequence.swift" rel="noreferrer">Sequence.swift</a> (most likely other places too, but I haven't really looked around). I know it's some type of declaration modifier but I'm not sure what it does.</p>
