{"ast_node_type":"other","tokens":[{"end":96,"kind":"keyword","start":0,"text":"if"}]}
                if !tcx.is_default_trait(def_id) && !tcx.is_lang_item(def_id, LangItem::Sized) {
                let def_id = trait_predicate.def_id();
                    // Do not add that restriction to the list if it is a positive requirement.