874     successors sets. It is meant to reuse the computation of a previous call to

   874     successors sets. It is meant to reuse the computation of a previous call to

   875     `successorssets` when multiple calls are made at the same time. The cache

   875     `successorssets` when multiple calls are made at the same time. The cache

   876     dictionary is updated in place. The caller is responsible for its life

   876     dictionary is updated in place. The caller is responsible for its life

   877     span. Code that makes multiple calls to `successorssets` *must* use this

   877     span. Code that makes multiple calls to `successorssets` *must* use this

   878     cache mechanism or suffer terrible performance.

   878     cache mechanism or suffer terrible performance.

   880     """

   879     """

   881 

   880 

   882     succmarkers = repo.obsstore.successors

   881     succmarkers = repo.obsstore.successors

   883 

   882 

   884     # Stack of nodes we search successors sets for

   883     # Stack of nodes we search successors sets for