Fix clippy ast utils

Co-authored-by: Michael Goulet <michael@errs.io>

Author: mu001999

src/tools/clippy/clippy_utils/src/ast_utils/mod.rs

@@ -813,7 +813,9 @@ pub fn eq_use_tree_kind(l: &UseTreeKind, r: &UseTreeKind) -> bool {
 pub fn eq_defaultness(l: Defaultness, r: Defaultness) -> bool {
     matches!(
         (l, r),
-        (Defaultness::Final, Defaultness::Final) | (Defaultness::Default(_), Defaultness::Default(_))
+        (Defaultness::Implicit, Defaultness::Implicit)
+        | (Defaultness::Default(_), Defaultness::Default(_))
+        | (Defaultness::Final(_), Defaultness::Final(_))
     )
 }