--- a/mercurial/templatekw.py	Sat Jun 17 13:23:55 2017 +0900
+++ b/mercurial/templatekw.py	Sat Jun 17 13:34:18 2017 +0900
@@ -570,7 +570,7 @@
 
     return _hybrid(None, predecessors,
                    lambda x: {'ctx': repo[x], 'revcache': {}},
-                   lambda d: short(scmutil.binnode(d['ctx'])))
+                   lambda d: _formatrevnode(d['ctx']))
 
 @templatekeyword('p1rev')
 def showp1rev(repo, ctx, templ, **args):