--- a/mercurial/bundle2.py	Thu Oct 18 17:54:07 2018 -0400
+++ b/mercurial/bundle2.py	Thu Nov 17 15:51:33 2016 -0800
@@ -839,7 +839,7 @@
             params = self._readexact(paramssize)
             self._processallparams(params)
             yield params
-            assert self._compengine.bundletype == 'UN'
+            assert self._compengine.bundletype()[1] == 'UN'
         # From there, payload might need to be decompressed
         self._fp = self._compengine.decompressorreader(self._fp)
         emptycount = 0