succeed A. It contains non-obsolete changesets only.
In most cases a changeset A has a single successors set containing a single
s (changeset A replaced by A').
+ successor (changeset A replaced by A').
A changeset that is made obsolete with no successors are called "pruned".
Such changesets have no successors sets at all.
A changeset that has been "split" will have a successors set containing
- more than one successor
+ more than one successor.
A changeset that has been rewritten in multiple different ways is called
"divergent". Such changesets have multiple successor sets (each of which