{"ast_node_type":"other","tokens":[{"end":51,"kind":"keyword","start":0,"text":"///"}]}
    /// then `Err(AlwaysRequiresDrop)` is returned.
    /// those types require drop. If the ADT is known to always need drop
    query adt_drop_tys(def_id: DefId) -> Result<&'tcx ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {