{"ast_node_type":"variable","tokens":[{"end":88,"kind":"keyword","start":0,"text":"let"}]}
                let parent_index = def_key.parent.expect("no parent for a constructor");
            if def_key.disambiguated_data.data == DefPathData::Ctor {
                self.def_key(parent_index).disambiguated_data.data.get_opt_name()