Method log_error

kuma-client/src/util.rs:45–50

(self, target: &str, cb: F)

    }

    fn log_error(self, target: &str, cb: F) -> Self {
        return self.map_err(|e| {
            error!(target: target, "{}", cb(&e).as_ref());
            e
        });
    }

    fn print_error(self, cb: F) -> Self {
        return self.map_err(|e| {