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impl Chan {
    // ...
    pub fn flags<'a>(&'a mut self, flags: &str) -> &'a Self {
        let mut f: fn(&mut Self, Flag) -> &Self = Self::set_flag;

        for ch in flags.chars() {
            let mut flag = Flag::Unknown;
            match ch {
                '+' => f = Self::set_flag,
                '-' => f = Self::unset_flag,
                'o' => flag = Flag::NeedsOp,
                'h' => flag = Flag::NeedsHop,
                'v' => flag = Flag::NeedsVoice,
            }

            f(self, flag);
        }

        self
    }
    // ...
}