fix tests on patricia-trie
@@ -262,12 +262,12 @@ impl<'a> Index<&'a StorageHandle> for NodeStorage {
/// # Example
/// ```
/// extern crate patricia_trie as trie;
+/// extern crate keccak_hash;
/// extern crate hashdb;
/// extern crate memorydb;
/// extern crate ethcore_bigint as bigint;
-/// extern crate hash;
///
-/// use hash::KECCAK_NULL_RLP;
+/// use keccak_hash::KECCAK_NULL_RLP;
/// use trie::*;
/// use hashdb::*;
/// use memorydb::*;
