diff --git a/src/disktree/iter.rs b/src/disktree/iter.rs
index d66ccd5..91966e3 100644
--- a/src/disktree/iter.rs
+++ b/src/disktree/iter.rs
@@ -169,7 +169,7 @@ impl<'a> Iterator for Iter<'a> {
     }
 }
 
-impl<'a> DtSeek for Iter<'a> {
+impl DtSeek for Iter<'_> {
     fn pos(&mut self) -> std::io::Result<Dp> {
         self.disktree_csr.pos()
     }
diff --git a/src/disktree/mod.rs b/src/disktree/mod.rs
index 65d0d4b..dfbc683 100644
--- a/src/disktree/mod.rs
+++ b/src/disktree/mod.rs
@@ -153,7 +153,7 @@ mod tests {
 
         // Assert neither hashmap nor disktree contain reserved cells.
         for cell in test_cells {
-            assert!(monaco_hashmap.get(&cell).is_none());
+            assert!(!monaco_hashmap.contains_key(&cell));
             assert!(!monaco_disktree.contains(cell).unwrap());
         }