pub trait Fn4HandlerExt<Fut>
where Fut: Future<Output = Result<Vec<u8>, Error>>,
{ // Required method fn into_handler(self) -> Fn4Handler<Fut>; }

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impl<F, Fut> Fn4HandlerExt<Fut> for F
where Fut: Future<Output = Result<Vec<u8>, Error>>, F: FnMut(&str, &str, &[u8], bool) -> Fut + 'static,