#![allow(dead_code, deprecated, unused_variables, unused_mut)]
use std::borrow::Borrow;
use std::hash::Hash;
pub struct HashMap<K, V> {
    marker: ::std::marker::PhantomData<(K, V)>,
}
impl<K, V> HashMap<K, V> {
    pub fn insert(&self, key: K, value: V) -> Option<V>
    where
        K: Hash + Eq,
    {
        unimplemented!()
    }
    pub fn get<Q>(&self, k: &Q) -> Option<&V>
    where
        K: Borrow<Q>,
        Q: Hash + Eq + ?Sized,
    {
        unimplemented!()
    }
}
fn main() {}