ref-stable-lru 0.2.2

An LRU Cache implementation with compile-time reference stability
Documentation 
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use ref_stable_lru::LruCache;
use std::num::NonZeroUsize;

fn main() {
    let mut cache: LruCache<&'static str, String> = LruCache::new(NonZeroUsize::new(3).unwrap());

    let _out = cache.scope(|mut handle, mut perm| {
        handle.put("a", "b".to_string(), &mut perm);
        handle.put("b", "c".to_string(), &mut perm);

        let x = handle.get(&"a", &perm).unwrap().as_str();
        let y = handle.get(&"b", &perm).unwrap().as_str();
        let z = handle.get(&"c", &perm).unwrap().as_str();

        // Should fail here since `x`, `y` and `z` have already borrowed `handle`.
        handle.put("c", "d".to_string(), &mut perm);

        [x, y, z].join(" ")
    });
}