diff -r 407ec7f3ff02 -r b81ad5b78a81 mercurial/templater.py
--- a/mercurial/templater.py	Tue Nov 07 13:48:33 2017 -0800
+++ b/mercurial/templater.py	Thu Oct 19 12:35:47 2017 +0200
@@ -1005,17 +1005,18 @@
                 "obsmakers")
         raise error.ParseError(msg)
 
-@templatefunc('obsfateverb(successors)')
+@templatefunc('obsfateverb(successors, markers)')
 def obsfateverb(context, mapping, args):
     """Compute obsfate related information based on successors (EXPERIMENTAL)"""
-    if len(args) != 1:
+    if len(args) != 2:
         # i18n: "obsfateverb" is a keyword
-        raise error.ParseError(_("obsfateverb expects one arguments"))
+        raise error.ParseError(_("obsfateverb expects two arguments"))
 
     successors = evalfuncarg(context, mapping, args[0])
+    markers = evalfuncarg(context, mapping, args[1])
 
     try:
-        return obsutil.successorsetverb(successors)
+        return obsutil.obsfateverb(successors, markers)
     except TypeError:
         # i18n: "obsfateverb" is a keyword
         errmsg = _("obsfateverb first argument should be countable")