1 files changed, 3 insertions, 5 deletions
diff --git a/src/merkle.rs b/src/merkle.rs
index 69e6c00..7bb2db4 100644
--- a/src/merkle.rs
+++ b/src/merkle.rs
@@ -16,9 +16,7 @@
 //! Merkle Tree implementation using SHA-512 and the Roughtime leaf and node tweak values.
 //!
 
-extern crate ring;
-
-use self::ring::digest;
+use ring::digest;
 use super::{HASH_LENGTH, TREE_LEAF_TWEAK, TREE_NODE_TWEAK};
 
 type Data = Vec<u8>;
@@ -97,7 +95,7 @@ impl MerkleTree {
     }
 
     pub fn reset(&mut self) {
-        for mut level in &mut self.levels {
+        for level in &mut self.levels {
             level.clear();
         }
     }
@@ -152,7 +150,7 @@ pub fn root_from_paths(mut index: usize, data: &[u8], paths: &[u8]) -> Hash {
 
 #[cfg(test)]
 mod test {
-    use merkle::*;
+    use crate::merkle::*;
 
     fn test_paths_with_num(num: usize) {
         let mut merkle = MerkleTree::new();