ConcHashMap<K, V, H>::new() returns ConcHashMap<K, V, RandomState> instead of ConcHashMap<K, V, H>

[hniksic]

While experimenting with a non-default hasher and ConcHashMap, I found that the new method doesn't include the hasher in its type signature. As a result, code like the following:

type MyMap = ConcHashMap<(u64, u64), u8>;
...
let x: MyMap = MyMap::new();

doesn't compile because MyMap::new returns a type different than MyMap. This doesn't look intentional and is probably fixed simply by changing the return type of new from ConcHashMap<K, V> to ConcHashMap<K, V, H>.

An easy workaround is to import the Default trait and use MyMap::default() instead of MyMap::new().