1 #![feature(allocator_api)]
2 #![feature(box_syntax)]
3 #![feature(drain_filter)]
4 #![feature(exact_size_is_empty)]
5 #![feature(option_flattening)]
7 #![feature(repeat_generic_slice)]
8 #![feature(trusted_len)]
9 #![feature(try_reserve)]
10 #![feature(unboxed_closures)]
11 #![deny(rust_2018_idioms)]
13 use std::hash::{Hash, Hasher};
14 use std::collections::hash_map::DefaultHasher;
30 fn hash<T: Hash>(t: &T) -> u64 {
31 let mut s = DefaultHasher::new();
36 // FIXME: Instantiated functions with i128 in the signature is not supported in Emscripten.
37 // See https://github.com/kripken/emscripten-fastcomp/issues/169
38 #[cfg(not(target_os = "emscripten"))]
40 fn test_boxed_hasher() {
41 let ordinary_hash = hash(&5u32);
43 let mut hasher_1 = Box::new(DefaultHasher::new());
44 5u32.hash(&mut hasher_1);
45 assert_eq!(ordinary_hash, hasher_1.finish());
47 let mut hasher_2 = Box::new(DefaultHasher::new()) as Box<dyn Hasher>;
48 5u32.hash(&mut hasher_2);
49 assert_eq!(ordinary_hash, hasher_2.finish());