Deterministic default hasher
Annoyed by your rust hashtables behaving differently each execution, and making reproducing bugs a matter of luck? Worry no more, simply use the deterministic default hasher, which is nothing else than a special constructor for the default hasher that always chooses the same seed, instead of using a random one.
Example
use DeterministicDefaultHasher;
let map = new;
The third argument defaults to DefaultHasher.
Using DeterministicDefaultHasher instead makes the hash map deterministic.