pub trait VecLike<D>: AsRef<[<D as SnapshotVecDelegate>::Value]> + AsMut<[<D as SnapshotVecDelegate>::Value]> + Rollback<UndoLog<D>>where
    D: SnapshotVecDelegate,
{ fn push(&mut self, item: <D as SnapshotVecDelegate>::Value); fn len(&self) -> usize; fn reserve(&mut self, size: usize); }

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