1 files changed, 2 insertions, 1 deletions
diff --git a/src/libsyntax/mut_visit.rs b/src/libsyntax/mut_visit.rs
index 2889f8edfc6..02e2c96868d 100644
--- a/src/libsyntax/mut_visit.rs
+++ b/src/libsyntax/mut_visit.rs
@@ -568,8 +568,9 @@ pub fn noop_visit_meta_item<T: MutVisitor>(mi: &mut MetaItem, vis: &mut T) {
     vis.visit_span(span);
 }
 
-pub fn noop_visit_arg<T: MutVisitor>(Arg { id, pat, ty }: &mut Arg, vis: &mut T) {
+pub fn noop_visit_arg<T: MutVisitor>(Arg { attrs, id, pat, ty }: &mut Arg, vis: &mut T) {
     vis.visit_id(id);
+    visit_thin_attrs(attrs, vis);
     vis.visit_pat(pat);
     vis.visit_ty(ty);
 }