Function rustc_ty_utils::needs_drop::adt_drop_tys_helper

fn adt_drop_tys_helper<'tcx>(
    tcx: TyCtxt<'tcx>, 
    def_id: DefId, 
    adt_has_dtor: impl Fn(&AdtDef) -> Option<DtorType>
) -> Result<&List<Ty<'tcx>>, AlwaysRequiresDrop>