1681         if rustrevlog is not None:

  1681         if rustrevlog is not None and self._nodemap_file is not None:

  1682             if self._nodemap_file is not None:

  1682             # we would like to use the rust_index in all case, especially

  1683                 use_rust_index = True

  1683             # because it is necessary for AncestorsIterator and LazyAncestors

  1684             else:

  1684             # since the 6.7 cycle.

  1685                 # Using the CIndex is not longer possible, as the

  1685             #

  1686                 # `AncestorsIterator` and `LazyAncestors` classes now require

  1686             # However, the performance impact of inconditionnaly building the

  1687                 # a Rust index for instantiation.

  1687             # nodemap is currently a problem for non-persistent nodemap

  1688                 use_rust_index = True

  1688             # repository.

  1689             use_rust_index = True