Method searcher

regex/src/exec.rs:1134–1142

reduces constant overhead

(&self)

    /// Get a searcher that isn't Sync.
    #[inline(always)] // reduces constant overhead
    pub fn searcher(&self) -> ExecNoSync {
        let create = || {
            Box::new(RefCell::new(ProgramCacheInner::new(&self.ro)))
        };
        ExecNoSync {
            ro: &self.ro, // a clone is too expensive here! (and not needed)
            cache: self.cache.get_or(create),
        }
    }

    /// Get a searcher that isn't Sync and can match on &str.
    #[inline(always)] // reduces constant overhead