Method set_range

regex/src/compile.rs:1016–1022

(&mut self, start: u8, end: u8)

    }

    fn set_range(&mut self, start: u8, end: u8) {
        debug_assert!(start <= end);
        if start > 0 {
            self.0[start as usize - 1] = true;
        }
        self.0[end as usize] = true;
    }

    fn set_word_boundary(&mut self) {
        // We need to mark all ranges of bytes whose pairs result in