{"ast_node_type":"variable","tokens":[{"end":84,"kind":"keyword","start":0,"text":"let"}]}
            let empty = (ty_def.is_struct() && ty_def.all_fields().next().is_none())
            let non_exhaustive = ty_def.is_variant_list_non_exhaustive();
                || (ty_def.is_enum() && ty_def.variants().is_empty());