You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: merge.rs
    path of file: ./repos/CYFS/src/component/cyfs-perf/cyfs-perf-base/src
    
    the code of the file until where you have to start completion: use std::collections::{hash_map::Entry, HashMap};


pub trait PerfItemMerge<T> {
    fn merge(&mut self, other: T);
}

// 为HashMap实现一个统一的Merge
impl<T> PerfItemMerge<HashMap<String, T>> for HashMap<String, T>
where
    T: PerfItemMerge<T>,
{
    fn merge(&mut self, oth
    
    fn merge(&mut self, other: HashMap<String, T>) {
        for (key, value) in other {
            match self.entry(key) {
                Entry::Occupied(mut o) => o.get_mut().merge(value),
                Entry::Vacant(v) => {
                    v.insert(value);
                }
            }
        }
    }