--- a/hgext3rd/evolve/compat.py	Thu Apr 19 16:51:53 2018 +0200
+++ b/hgext3rd/evolve/compat.py	Thu Apr 19 16:08:01 2018 +0200
@@ -11,7 +11,6 @@
 from mercurial import (
     copies,
     context,
-    hg,
     mdiff,
     obsolete,
     obsutil,
@@ -39,45 +38,6 @@
 
 eh = exthelper.exthelper()
 
-if not util.safehasattr(hg, '_copycache'):
-    # exact copy of relevantmarkers as in Mercurial-176d1a0ce385
-    # this fixes relevant markers computation for version < hg-4.3
-    @eh.wrapfunction(obsolete.obsstore, 'relevantmarkers')
-    def relevantmarkers(orig, self, nodes):
-        """return a set of all obsolescence markers relevant to a set of nodes.
-
-        "relevant" to a set of nodes mean:
-
-        - marker that use this changeset as successor
-        - prune marker of direct children on this changeset
-        - recursive application of the two rules on precursors of these markers
-
-        It is a set so you cannot rely on order.
-
-        Backport of mercurial changeset 176d1a0ce385 for version < 4.3
-        """
-
-        pendingnodes = set(nodes)
-        seenmarkers = set()
-        seennodes = set(pendingnodes)
-        precursorsmarkers = self.predecessors
-        succsmarkers = self.successors
-        children = self.children
-        while pendingnodes:
-            direct = set()
-            for current in pendingnodes:
-                direct.update(precursorsmarkers.get(current, ()))
-                pruned = [m for m in children.get(current, ()) if not m[1]]
-                direct.update(pruned)
-                pruned = [m for m in succsmarkers.get(current, ()) if not m[1]]
-                direct.update(pruned)
-            direct -= seenmarkers
-            pendingnodes = set([m[0] for m in direct])
-            seenmarkers |= direct
-            pendingnodes -= seennodes
-            seennodes |= pendingnodes
-        return seenmarkers
-
 # successors set move from mercurial.obsolete to mercurial.obsutil in 4.3
 def successorssets(*args, **kwargs):
     func = getattr(obsutil, 'successorssets', None)