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: hash.rs
    path of file: ./repos/legion/src/internals
    
    the code of the file until where you have to start completion: use std::hash::Hasher;

/// A hasher optimized for hashing component type IDs.
#[derive(Default)]
pub struct ComponentTypeIdHasher(u64);

impl Hasher for ComponentTypeIdHasher {
    #[inline]
    fn finish(&self) -> u64 {
        self.0
    }

    #[inline]
    fn write_u64(&mut self, seed: u64) {
        // This must only be used to hash one val
    
fn hasher() {
    fn verify<T: 'static + ?Sized>() {
        use core::{any::TypeId, hash::Hash};

        let mut hasher = ComponentTypeIdHasher::default();
        let type_id = TypeId::of::<T>();
        type_id.hash(&mut hasher);
        assert_eq!(hasher.finish(), unsafe {
            core::mem::transmute::<TypeId, u64>(type_id)
        });
    }

    verify::<usize>();
    verify::<()>();
    verify::<str>();
    verify::<&'static str>();
    verify::<[u8; 20]>();
}