diff -r 4279ec5ff3a7 -r 53e07f12a3e6 hgext/evolve.py
--- a/hgext/evolve.py	Fri Apr 10 23:48:23 2015 -0400
+++ b/hgext/evolve.py	Sat Apr 11 00:10:10 2015 -0400
@@ -2515,10 +2515,10 @@
     undecided = set(probeset)
     _takefullsample = setdiscovery._takefullsample
     if remote.capable('_evoext_obshash_1'):
-        remotehash = remote.evoext_obshash1
+        getremotehash = remote.evoext_obshash1
         localhash = _obsrelsethashtreefm1(local)
     else:
-        remotehash = remote.evoext_obshash
+        getremotehash = remote.evoext_obshash
         localhash = _obsrelsethashtreefm0(local)
 
     while undecided:
@@ -2534,7 +2534,7 @@
                  % (roundtrips, len(undecided), len(sample)))
         # indices between sample and externalized version must match
         sample = list(sample)
-        remotehash = remotehash(dag.externalizeall(sample))
+        remotehash = getremotehash(dag.externalizeall(sample))
 
         yesno = [localhash[ix][1] == remotehash[si]
                  for si, ix in enumerate(sample)]