Method insert

regex/src/sparse.rs:46–51

(&mut self, value: usize)

    }

    pub fn insert(&mut self, value: usize) {
        let i = self.len();
        assert!(i < self.capacity());
        self.dense.push(value);
        self.sparse[value] = i;
    }

    pub fn contains(&self, value: usize) -> bool {
        let i = self.sparse[value];