--- a/hgext3rd/evolve/__init__.py	Fri Aug 11 09:32:23 2017 +0200
+++ b/hgext3rd/evolve/__init__.py	Fri Aug 11 10:41:11 2017 +0200
@@ -504,7 +504,7 @@
     """Precursor of a changeset"""
     cs = set()
     nm = repo.changelog.nodemap
-    markerbysubj = repo.obsstore.precursors
+    markerbysubj = repo.obsstore.predecessors
     node = repo.changelog.node
     for r in s:
         for p in markerbysubj.get(node(r), ()):
@@ -519,7 +519,7 @@
     node = repo.changelog.node
     toproceed = [node(r) for r in s]
     seen = set()
-    allsubjects = repo.obsstore.precursors
+    allsubjects = repo.obsstore.predecessors
     while toproceed:
         nc = toproceed.pop()
         for mark in allsubjects.get(nc, ()):

--- a/hgext3rd/evolve/compat.py	Fri Aug 11 09:32:23 2017 +0200
+++ b/hgext3rd/evolve/compat.py	Fri Aug 11 10:41:11 2017 +0200
@@ -47,7 +47,7 @@
         pendingnodes = set(nodes)
         seenmarkers = set()
         seennodes = set(pendingnodes)
-        precursorsmarkers = self.precursors
+        precursorsmarkers = self.predecessors
         succsmarkers = self.successors
         children = self.children
         while pendingnodes:
@@ -141,3 +141,11 @@
         return instabilities
 
     context.basectx.instabilities = instabilities
+
+# XXX: Better detection of property cache
+if 'predecessors' not in dir(obsolete.obsstore):
+    @property
+    def predecessors(self):
+        return self.precursors
+
+    obsolete.obsstore.predecessors = predecessors

--- a/hgext3rd/evolve/hack/drophack.py	Fri Aug 11 09:32:23 2017 +0200
+++ b/hgext3rd/evolve/hack/drophack.py	Fri Aug 11 10:41:11 2017 +0200
@@ -50,7 +50,7 @@
     seennodes = set(nodes)
     seenmarkers = set()
     pendingnodes = set(nodes)
-    precursorsmarkers = obsstore.precursors
+    precursorsmarkers = obsstore.predecessors
     while pendingnodes:
         current = pendingnodes.pop()
         new = set()

--- a/hgext3rd/evolve/obshistory.py	Fri Aug 11 09:32:23 2017 +0200
+++ b/hgext3rd/evolve/obshistory.py	Fri Aug 11 10:41:11 2017 +0200
@@ -301,7 +301,7 @@
     - The dictionnary of each node successors, values are a set
     - The dictionnary of each node precursors, values are a list
     """
-    precursors = repo.obsstore.precursors
+    precursors = repo.obsstore.predecessors
     successors = repo.obsstore.successors
     nodec = repo.changelog.node
 
@@ -358,7 +358,7 @@
 def _debugobshistoryrevs(fm, repo, revs, opts):
     """ Display the obsolescence history for revset
     """
-    precursors = repo.obsstore.precursors
+    precursors = repo.obsstore.predecessors
     successors = repo.obsstore.successors
     nodec = repo.changelog.node
     unfi = repo.unfiltered()

--- a/hgext3rd/evolve/templatekw.py	Fri Aug 11 09:32:23 2017 +0200
+++ b/hgext3rd/evolve/templatekw.py	Fri Aug 11 10:41:11 2017 +0200
@@ -51,7 +51,7 @@
     """ Yield the list of next precursors pointing on visible changectx nodes
     """
 
-    precursors = repo.obsstore.precursors
+    precursors = repo.obsstore.predecessors
     stack = [nodeid]
 
     while stack: