Function query_feed 

pub(crate) fn query_feed<'tcx, Cache>(
    tcx: TyCtxt<'tcx>,
    dep_kind: DepKind,
    query_vtable: &QueryVTable<'tcx, Cache>,
    cache: &Cache,
    key: Cache::Key,
    value: Cache::Value,
)
where
    Cache: QueryCache,
    Cache::Key: DepNodeKey<TyCtxt<'tcx>>,

Common implementation of query feeding, used by define_feedable!.