diff --git a/src/ast.rs b/src/ast.rs
index d3001fd31e2c6e60bd36b3e28d0279aafc1d7a4a..3d1a1aaaa8cc12d41a4bb3888038de0cfc713145 100644
--- a/src/ast.rs
+++ b/src/ast.rs
@@ -297,8 +297,8 @@ impl Display for Type {
             Never => write!(fmt, "!"),
             Bool => write!(fmt, "bool"),
             I32 => write!(fmt, "i32"),
-            //Ref((is_mut, t)) => write!(fmt, "&{}", t),
-            //RefMut(t) => write!(fmt, "&mut {}", t),
+            Ref(t) => write!(fmt, "&{}", t),
+            Mut(t) => write!(fmt, "mut {}", t),
             _ => unimplemented!(),
         }
     }