pub type RowEnter<T, R, TEnter> = TraceEnter<TraceFrontier<TraceAgent<Spine<Rc<OrdKeyBatch<RowLayout<((Row, ()), T, R)>>>, ColumnatedMergeBatcher<Row, (), T, R>, RcBuilder<OrdKeyBuilder<RowLayout<((Row, ()), T, R)>>>>>>, TEnter>;
struct RowEnter<T, R, TEnter> {
trace: TraceFrontier<TraceAgent<Spine<Rc<OrdKeyBatch<RowLayout<((Row, ()), T, R)>>>, ColumnatedMergeBatcher<Row, (), T, R>, RcBuilder<OrdKeyBuilder<RowLayout<((Row, ()), T, R)>>>>>>,
stash1: Antichain<<TraceFrontier<TraceAgent<Spine<Rc<OrdKeyBatch<RowLayout<((Row, ()), T, R)>>>, ColumnatedMergeBatcher<Row, (), T, R>, RcBuilder<OrdKeyBuilder<RowLayout<((Row, ()), T, R)>>>>>> as TraceReader>::Time>,
stash2: Antichain<TEnter>,
}