--- a/hgext3rd/evolve/stablerange.py	Wed Mar 22 05:36:45 2017 +0100
+++ b/hgext3rd/evolve/stablerange.py	Wed Mar 22 05:44:39 2017 +0100
@@ -9,7 +9,6 @@
 
 import collections
 import math
-import hashlib
 
 from mercurial import (
     commands,
@@ -24,7 +23,6 @@
 
 from . import (
     exthelper,
-    obsolete,
 )
 
 eh = exthelper.exthelper()
@@ -387,39 +385,6 @@
     def subranges(self):
         return self._repo.stablerange.subranges(self._repo, self)
 
-    @util.propertycache
-    def obshash(self):
-        cache = self._repo.obsstore.rangeobshashcache
-        obshash = cache.get(self)
-        if obshash is not None:
-            return obshash
-        pieces = []
-        nullid = nodemod.nullid
-        if len(self) == 1:
-            tmarkers = self._repo.obsstore.relevantmarkers([self.node])
-            pieces = []
-            for m in tmarkers:
-                mbin = obsolete._fm1encodeonemarker(m)
-                pieces.append(mbin)
-            pieces.sort()
-        else:
-            for subrange in self.subranges():
-                obshash = subrange.obshash
-                if obshash != nullid:
-                    pieces.append(obshash)
-
-        sha = hashlib.sha1()
-        # note: if there is only one subrange with actual data, we'll just
-        # reuse the same hash.
-        if not pieces:
-            obshash = nodemod.nullid
-        elif len(pieces) != 1 or obshash is None:
-            sha = hashlib.sha1()
-            for p in pieces:
-                sha.update(p)
-            obshash = cache[self] = sha.digest()
-        return obshash
-
 @eh.reposetup
 def setupcache(ui, repo):