--- a/hgext3rd/evolve/__init__.py	Wed Jan 10 15:57:43 2018 +0530
+++ b/hgext3rd/evolve/__init__.py	Wed Jan 10 15:59:35 2018 +0530
@@ -257,7 +257,6 @@
 import sys
 import re
 import collections
-import errno
 import struct
 
 try:
@@ -2484,70 +2483,6 @@
     util.unlinkpath(repo.vfs.join('evolvestate'), ignoremissing=True)
     return ret
 
-def _evolvestatewrite(repo, state):
-    # [version]
-    # [type][length][content]
-    #
-    # `version` is a 4 bytes integer (handled at higher level)
-    # `type` is a single character, `length` is a 4 byte integer, and
-    # `content` is an arbitrary byte sequence of length `length`.
-    f = repo.vfs('evolvestate', 'w')
-    try:
-        f.write(_pack('>I', evolvestateversion))
-        current = state['current']
-        key = 'C' # as in 'current'
-        format = '>sI%is' % len(current)
-        f.write(_pack(format, key, len(current), current))
-    finally:
-        f.close()
-
-def _evolvestateread(repo):
-    try:
-        f = repo.vfs('evolvestate')
-    except IOError as err:
-        if err.errno != errno.ENOENT:
-            raise
-        return None
-    try:
-        versionblob = f.read(4)
-        if len(versionblob) < 4:
-            repo.ui.debug('ignoring corrupted evolvestate (file contains %i bits)'
-                          % len(versionblob))
-            return None
-        version = _unpack('>I', versionblob)[0]
-        if version != evolvestateversion:
-            msg = _('unknown evolvestate version %i') % version
-            raise error.Abort(msg, hint=_('upgrade your evolve'))
-        records = []
-        data = f.read()
-        off = 0
-        end = len(data)
-        while off < end:
-            rtype = data[off]
-            off += 1
-            length = _unpack('>I', data[off:(off + 4)])[0]
-            off += 4
-            record = data[off:(off + length)]
-            off += length
-            if rtype == 't':
-                rtype, record = record[0], record[1:]
-            records.append((rtype, record))
-        state = {}
-        for rtype, rdata in records:
-            if rtype == 'C':
-                state['current'] = rdata
-            elif rtype.lower():
-                repo.ui.debug('ignore evolve state record type %s' % rtype)
-            else:
-                raise error.Abort(_('unknown evolvestate field type %r')
-                                  % rtype, hint=_('upgrade your evolve'))
-        return state
-    finally:
-        f.close()
-
-def _evolvestatedelete(repo):
-    util.unlinkpath(repo.vfs.join('evolvestate'), ignoremissing=True)
-
 def _evolvemerge(repo, orig, dest, pctx, keepbranch):
     """Used by the evolve function to merge dest on top of pctx.
     return the same tuple as merge.graft"""