library/alloc/tests/lib.rs

   1 #![feature(allocator_api)]
   2 #![feature(box_syntax)]
   3 #![feature(btree_drain_filter)]
   4 #![feature(drain_filter)]
   5 #![feature(exact_size_is_empty)]
   6 #![feature(map_first_last)]
   7 #![feature(new_uninit)]
   8 #![feature(pattern)]
   9 #![feature(trusted_len)]
  10 #![feature(try_reserve)]
  11 #![feature(unboxed_closures)]
  12 #![feature(associated_type_bounds)]
  13 #![feature(binary_heap_into_iter_sorted)]
  14 #![feature(binary_heap_drain_sorted)]
  15 #![feature(split_inclusive)]
  16 #![feature(binary_heap_retain)]
  17
  18 use std::collections::hash_map::DefaultHasher;
  19 use std::hash::{Hash, Hasher};
  20
  21 mod arc;
  22 mod binary_heap;
  23 mod borrow;
  24 mod boxed;
  25 mod btree;
  26 mod cow_str;
  27 mod fmt;
  28 mod heap;
  29 mod linked_list;
  30 mod rc;
  31 mod slice;
  32 mod str;
  33 mod string;
  34 mod vec;
  35 mod vec_deque;
  36
  37 fn hash<T: Hash>(t: &T) -> u64 {
  38     let mut s = DefaultHasher::new();
  39     t.hash(&mut s);
  40     s.finish()
  41 }
  42
  43 // FIXME: Instantiated functions with i128 in the signature is not supported in Emscripten.
  44 // See https://github.com/kripken/emscripten-fastcomp/issues/169
  45 #[cfg(not(target_os = "emscripten"))]
  46 #[test]
  47 fn test_boxed_hasher() {
  48     let ordinary_hash = hash(&5u32);
  49
  50     let mut hasher_1 = Box::new(DefaultHasher::new());
  51     5u32.hash(&mut hasher_1);
  52     assert_eq!(ordinary_hash, hasher_1.finish());
  53
  54     let mut hasher_2 = Box::new(DefaultHasher::new()) as Box<dyn Hasher>;
  55     5u32.hash(&mut hasher_2);
  56     assert_eq!(ordinary_hash, hasher_2.finish());
  57 }