--- a/mercurial/util.py	Thu Mar 22 21:56:20 2018 +0900
+++ b/mercurial/util.py	Thu Mar 22 22:39:43 2018 +0900
@@ -4079,8 +4079,6 @@
 parsedate = _deprecatedfunc(dateutil.parsedate, '4.6')
 matchdate = _deprecatedfunc(dateutil.matchdate, '4.6')
 
-def _deprecatedfunc(func, version):  # TODO
-    return func
 escapedata = _deprecatedfunc(stringutil.escapedata, '4.6')
 binary = _deprecatedfunc(stringutil.binary, '4.6')
 stringmatcher = _deprecatedfunc(stringutil.stringmatcher, '4.6')