Listened to compiler

src/hufftree/canonical.rs

@@ -4,7 +4,6 @@ use bit_vec::BitVec;
 
 #[derive(Debug)]
 pub struct CanonicalHufftree {
-    base_tree: Hufftree,
     characters_and_codes: BiMap<char, BitVec>,
 }
 
@@ -76,7 +75,6 @@ impl CanonicalHufftree {
         }
 
         CanonicalHufftree {
-            base_tree,
             characters_and_codes: output_characters_and_codes,
         }
     }