--- a/hgext3rd/serverminitopic.py	Tue Aug 06 11:17:38 2019 +0200
+++ b/hgext3rd/serverminitopic.py	Tue Aug 06 11:26:29 2019 +0200
@@ -67,7 +67,7 @@
 
     def _init__(self, *args, **kwargs):
         super(revbranchcacheoverlay, self).__init__(*args, **kwargs)
-        if 'branchinfo' in vars(self):
+        if r'branchinfo' in vars(self):
             del self.branchinfo
 
     def branchinfo(self, rev, changelog=None):
@@ -95,7 +95,7 @@
                     class topicawarerbc(revbranchcacheoverlay, cache.__class__):
                         pass
                     cache.__class__ = topicawarerbc
-                    if 'branchinfo' in vars(cache):
+                    if r'branchinfo' in vars(cache):
                         del cache.branchinfo
                     self._revbranchcache = cache
                 return self._revbranchcache