diff --git a/src/librustc/hir/intravisit.rs b/src/librustc/hir/intravisit.rs
index 2a351d99841f..f2d1678d3369 100644
--- a/src/librustc/hir/intravisit.rs
+++ b/src/librustc/hir/intravisit.rs
@@ -607,9 +607,8 @@ pub fn walk_ty<'v, V: Visitor<'v>>(visitor: &mut V, typ: &'v Ty) {
             }
             visitor.visit_lifetime(lifetime);
         }
-        TyImplTraitExistential(item_id, def_id, ref lifetimes) => {
+        TyImplTraitExistential(_, def_id, ref lifetimes) => {
             visitor.visit_def_mention(Def::Existential(def_id));
-            visitor.visit_nested_item(item_id);
             walk_list!(visitor, visit_lifetime, lifetimes);
         }
         TyTypeof(ref expression) => {