Method union

regex/regex-syntax/src/hir/interval.rs:353–360

Union the given overlapping range into this range. If the two ranges aren't contiguous, then this returns `None`.

(&self, other: &Self)

    ///
    /// If the two ranges aren't contiguous, then this returns `None`.
    fn union(&self, other: &Self) -> Option<Self> {
        if !self.is_contiguous(other) {
            return None;
        }
        let lower = cmp::min(self.lower(), other.lower());
        let upper = cmp::max(self.upper(), other.upper());
        Some(Self::create(lower, upper))
    }

    /// Intersect this range with the given range and return the result.
    ///