obsolete: pass cache argument of successors set explicitly

We plan to add a new argument to successorsets. But first we need to update
all callers to pass cache argument explicitly to avoid arguments confusion.

mercurial/debugcommands.py

@@ -2111,7 +2111,7 b' def debugsuccessorssets(ui, repo, *revs)'
     for rev in scmutil.revrange(repo, revs):
         ctx = repo[rev]
         ui.write('%s\n'% ctx2str(ctx))
-        for succsset in obsutil.successorssets(repo, ctx.node(), cache):
+        for succsset in obsutil.successorssets(repo, ctx.node(), cache=cache):
             if succsset:
                 ui.write('    ')
                 ui.write(node2str(succsset[0]))

mercurial/obsolete.py

@@ -958,7 +958,7 b' def _computedivergentset(repo):'
                 continue # emergency cycle hanging prevention
             seen.add(prec)
             if prec not in newermap:
-                obsutil.successorssets(repo, prec, newermap)
+                obsutil.successorssets(repo, prec, cache=newermap)
             newer = [n for n in newermap[prec] if n]
             if len(newer) > 1:
                 divergent.add(ctx.rev())