diff -r 68e3d6e83ca5 -r 66c02a2e8e2f hgext/evolve.py
--- a/hgext/evolve.py	Wed Feb 19 18:14:20 2014 -0800
+++ b/hgext/evolve.py	Thu Feb 13 18:09:54 2014 -0800
@@ -301,6 +301,31 @@
 reposetup = eh.final_reposetup
 
 #####################################################################
+### experimental behavior                                         ###
+#####################################################################
+
+@eh.wrapfunction(mercurial.obsolete, 'createmarkers')
+def _createmarkers(orig, repo, relations, *args, **kwargs):
+    """register parent information at prune time"""
+    # every time this test is run, a kitten is slain.
+    # Change it as soon as possible
+    if '[,{metadata}]' in orig.__doc__:
+        for idx, rel in enumerate(relations):
+            prec = rel[0]
+            sucs = rel[1]
+            if not sucs:
+                meta = {}
+                if 2 < len(rel):
+                    meta.update(rel[2])
+                for i, p in enumerate(prec.parents(), 1):
+                    meta['p%i' % i] = p.hex()
+                relations[idx] = (prec, sucs, meta)
+    return orig(repo, relations, *args, **kwargs)
+
+def createmarkers(*args, **kwargs):
+    return obsolete.createmarkers(*args, **kwargs)
+
+#####################################################################
 ### Critical fix                                                  ###
 #####################################################################
 
@@ -337,8 +362,6 @@
 # - function to travel throught the obsolescence graph
 # - function to find useful changeset to stabilize
 
-createmarkers = obsolete.createmarkers
-
 
 ### Useful alias