--- a/hgext3rd/topic/__init__.py	Fri Sep 01 17:37:47 2017 +0200
+++ b/hgext3rd/topic/__init__.py	Fri Sep 01 17:53:14 2017 +0200
@@ -310,7 +310,7 @@
 
 @command('topics', [
         ('', 'clear', False, 'clear active topic if any'),
-        ('r', 'rev', '', 'revset of existing revisions', _('REV')),
+        ('r', 'rev', [], 'revset of existing revisions', _('REV')),
         ('l', 'list', False, 'show the stack of changeset in the topic'),
         ('', 'age', False, 'show when you last touched the topics'),
         ('', 'current', None, 'display the current topic only'),
@@ -354,6 +354,10 @@
     if clear and topic:
         raise error.Abort(_("cannot use --clear when setting a topic"))
 
+    touchedrevs = set()
+    if rev:
+        touchedrevs = scmutil.revrange(repo, rev)
+
     if topic:
         topic = topic.strip()
         if not topic:
@@ -370,7 +374,7 @@
             raise error.Abort(_('no active topic to list'))
         return stack.showstack(ui, repo, topic=topic, opts=opts)
 
-    if rev:
+    if touchedrevs:
         if not obsolete.isenabled(repo, obsolete.createmarkersopt):
             raise error.Abort(_('must have obsolete enabled to change topics'))
         if clear:
@@ -379,14 +383,14 @@
             topic = repo.currenttopic
         elif not topic:
             raise error.Abort('changing topic requires a topic name or --clear')
-        if any(not c.mutable() for c in repo.set('%r and public()', rev)):
+        if repo.revs('%ld and public()', touchedrevs):
             raise error.Abort("can't change topic of a public change")
         wl = l = txn = None
         try:
             wl = repo.wlock()
             l = repo.lock()
             txn = repo.transaction('rewrite-topics')
-            rewrote = _changetopics(ui, repo, rev, topic)
+            rewrote = _changetopics(ui, repo, touchedrevs, topic)
             txn.close()
             ui.status('changed topic on %d changes\n' % rewrote)
         finally:
@@ -446,7 +450,7 @@
         if repo.vfs.exists('topic'):
             repo.vfs.unlink('topic')
 
-def _changetopics(ui, repo, revset, newtopic):
+def _changetopics(ui, repo, revs, newtopic):
     """ Changes topic to newtopic of all the revisions in the revset and return
     the count of revisions whose topic has been changed.
     """
@@ -454,7 +458,9 @@
     p1 = None
     p2 = None
     successors = {}
-    for c in repo.set('%r', revset):
+    for r in revs:
+        c = repo[r]
+
         def filectxfn(repo, ctx, path):
             try:
                 return c[path]