3 #![allow(unused_imports)]
5 #![allow(non_camel_case_types)]
6 #![allow(non_snake_case)]
7 #![allow(overflowing_literals)]
9 use std::hash::{Hash, SipHasher, Hasher};
10 use std::mem::size_of;
19 // test for hygiene name collisions
20 #[derive(Hash)] struct __H__H;
21 #[derive(Hash)] enum Collision<__H> { __H { __H__H: __H } }
26 fn hash<T: Hash>(t: &T) -> u64 {
27 let mut s = SipHasher::new();
32 struct FakeHasher<'a>(&'a mut Vec<u8>);
33 impl<'a> Hasher for FakeHasher<'a> {
34 fn finish(&self) -> u64 {
38 fn write(&mut self, bytes: &[u8]) {
43 fn fake_hash<A: Hash>(v: &mut Vec<u8>, a: A) {
44 a.hash(&mut FakeHasher(v));
48 let person1 = Person {
50 name: "Janet".to_string(),
53 let person2 = Person {
55 name: "Bob".to_string(),
58 assert_eq!(hash(&person1), hash(&person1));
59 assert!(hash(&person1) != hash(&person2));
64 fake_hash(&mut va, E::A);
65 fake_hash(&mut vb, E::B);
68 // issue #39137: single variant enum hash should not hash discriminant
70 enum SingleVariantEnum {
74 fake_hash(&mut v, SingleVariantEnum::A(17));
75 assert_eq!(vec![17], v);