commonAncWithSetClosure(ctx context.Context, c1, c2 *Commit, vr1, vr2 types.ValueReader, ns1, ns2 tree.NodeStore)
: (a hash.Hash, ok bool, err error)
commonAncWithLazyClosure(ctx context.Context, c1, c2 *Commit, vr1, vr2 types.ValueReader, ns1, ns2 tree.NodeStore)
: (a hash.Hash, ok bool, err error)