Remove left over comment

Author: eopb

compiler/rustc_trait_selection/src/traits/object_safety.rs

@@ -840,10 +840,7 @@ fn contains_illegal_self_type_reference<'tcx, T: TypeFoldable<'tcx>>(
             if let Ok(Some(ct)) = AbstractConst::new(self.tcx, uv.shrink()) {
                 const_evaluatable::walk_abstract_const(self.tcx, ct, |node| {
                     match node.root(self.tcx, ct.substs) {
-                        Node::Leaf(leaf) => {
-                            // let leaf = leaf.subst(self.tcx, ct.substs);
-                            self.visit_const(leaf)
-                        }
+                        Node::Leaf(leaf) => self.visit_const(leaf),
                         Node::Cast(_, _, ty) => self.visit_ty(ty),
                         Node::Binop(..) | Node::UnaryOp(..) | Node::FunctionCall(_, _) => {
                             ControlFlow::CONTINUE