kash 0.7.1

Function and method cache and memoization
Documentation 
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#![allow(
    clippy::arithmetic_side_effects,
    unused_mut,
    clippy::needless_lifetimes,
    clippy::needless_pass_by_value,
    clippy::unwrap_used,
    clippy::ref_option
)]
use kash::kash;
use std::thread::sleep;
use std::time::{Duration, Instant};

#[kash(size = "50")]
fn slow_fn(n: u32) -> String {
    if n == 0 {
        return "done".to_string();
    }
    sleep(Duration::new(1, 0));
    slow_fn(n - 1)
}

#[kash(size = "50")]
#[must_use]
pub fn slow_fn_with_mut_self(mut n: u32) -> String {
    if n == 0 {
        return "done".to_string();
    }
    sleep(Duration::new(1, 0));
    slow_fn_with_mut_self(n - 1)
}

#[kash(size = "50")]
#[must_use]
pub fn slow_fn_with_lifetime<'a>(n: &'a i32) -> String {
    if *n == 0 {
        return "done".to_string();
    }
    sleep(Duration::new(1, 0));
    slow_fn_with_lifetime(&(n - 1))
}

#[kash(key(ty = "String", expr = r#"{ format!("{}", n.to_string()) }"#))]
fn slow_fn_generic<T>(n: T) -> String
where
    T: ToString,
{
    sleep(Duration::new(1, 0));
    n.to_string()
}

#[kash(key(ty = "String", expr = r#"{ format!("{}", n.to_string()) }"#))]
fn slow_fn_ref_generic<T>(n: &T) -> String
where
    T: ToString,
{
    sleep(Duration::new(1, 0));
    n.to_string()
}

#[kash(key(
    ty = "String",
    expr = r#"{ format!("{}", n.clone().unwrap().to_string()) }"#
))]
fn slow_fn_ref_option_generic<T>(n: &Option<T>) -> String
where
    T: ToString + Clone,
{
    sleep(Duration::new(1, 0));
    n.clone().unwrap().to_string()
}

pub fn main() {
    println!("[kash] Initial run...");
    let now = Instant::now();
    let _ = slow_fn(10);
    println!("[kash] Elapsed: {}\n", now.elapsed().as_secs());

    println!("[kash] Kash run...");
    let now = Instant::now();
    let _ = slow_fn(10);
    println!("[kash] Elapsed: {}\n", now.elapsed().as_secs());

    // Inspect the cache
    // {
    //     println!("[kash] ** Cache info **");
    //     let cache = SLOW_FN.clone();
    //     assert_eq!(cache.cache_hits().unwrap(), 1);
    //     println!("[kash] hits=1 -> {:?}", cache.cache_hits().unwrap() == 1);
    //     assert_eq!(cache.cache_misses().unwrap(), 11);
    //     println!(
    //         "[kash] misses=11 -> {:?}",
    //         cache.cache_misses().unwrap() == 11
    //     );
    //     // make sure the cache-lock is dropped
    // }

    println!("done!");
}