Borrowing

gistfile1.rs

        let isAbsoluteUri = match req.request_uri {
            AbsolutePath(_) => true,
            _ => false
        };

        if isAbsoluteUri {
            match req.request_uri {
                AbsolutePath(ref mut path) => {
                    *path = path.as_slice().slice_from(self.route.len()).to_string();
                },
                // Absolutely cannot happen because of our previous check.
                _ => fail!()
            } // Previous borrow of req ends here.
            // So we can borrow it again here.
            self.iron.furnace.forge(req, res, Some(alloy));

            // And repair the damage here, for future middleware
            match req.request_uri {
                AbsolutePath(ref mut path) => {
                    *path = self.route.clone().append(path.as_slice());
                },
                // Absolutely cannot happen because of our previous check.
                _ => fail!()
            } // Previous borrow of req ends here.
            Unwind
        } else {
            Continue
        }