diff --git a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs b/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
index f522e272ecf..0441e3a1693 100644
--- a/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
+++ b/compiler/rustc_trait_selection/src/traits/error_reporting/mod.rs
@@ -1088,6 +1088,13 @@ fn suggest_unsized_bound_if_applicable(
         obligation: &PredicateObligation<'tcx>,
     );
 
+    fn maybe_suggest_unsized_generics(
+        &self,
+        err: &mut DiagnosticBuilder<'tcx>,
+        span: Span,
+        node: Node<'hir>,
+    );
+
     fn is_recursive_obligation(
         &self,
         obligated_types: &mut Vec<&ty::TyS<'tcx>>,
@@ -1774,6 +1781,15 @@ fn suggest_unsized_bound_if_applicable(
             (Some(node), true) => node,
             _ => return,
         };
+        self.maybe_suggest_unsized_generics(err, span, node);
+    }
+
+    fn maybe_suggest_unsized_generics(
+        &self,
+        err: &mut DiagnosticBuilder<'tcx>,
+        span: Span,
+        node: Node<'hir>,
+    ) {
         let generics = match node.generics() {
             Some(generics) => generics,
             None => return,
@@ -1792,7 +1808,7 @@ fn suggest_unsized_bound_if_applicable(
             {
                 continue;
             }
-            debug!("suggest_unsized_bound_if_applicable: param={:?}", param);
+            debug!("maybe_suggest_unsized_generics: param={:?}", param);
             match node {
                 hir::Node::Item(
                     item