diff -r 661025fd3e1c -r 89610c586fa2 mercurial/templatekw.py
--- a/mercurial/templatekw.py	Sun Jun 18 23:05:54 2017 -0400
+++ b/mercurial/templatekw.py	Sat Jun 17 13:18:03 2017 +0900
@@ -568,8 +568,8 @@
     predecessors = sorted(obsutil.closestpredecessors(repo, ctx.node()))
     predecessors = map(hex, predecessors)
 
-    return _hybrid(None, predecessors, lambda x: {'predecessor': x},
-                   lambda d: d['predecessor'][:12])
+    return _hybrid(None, predecessors, lambda x: {'node': x},
+                   lambda d: d['node'][:12])
 
 @templatekeyword('p1rev')
 def showp1rev(repo, ctx, templ, **args):