diff -r c3bdc27121d1 -r 158b41842fd2 mercurial/commands.py
--- a/mercurial/commands.py	Wed Aug 17 20:40:13 2016 -0700
+++ b/mercurial/commands.py	Wed Aug 17 20:41:05 2016 -0700
@@ -1867,34 +1867,6 @@
     with repo.wlock(False):
         return cmdutil.copy(ui, repo, pats, opts)
 
-@command('debugcomplete',
-    [('o', 'options', None, _('show the command options'))],
-    _('[-o] CMD'),
-    norepo=True)
-def debugcomplete(ui, cmd='', **opts):
-    """returns the completion list associated with the given command"""
-
-    if opts.get('options'):
-        options = []
-        otables = [globalopts]
-        if cmd:
-            aliases, entry = cmdutil.findcmd(cmd, table, False)
-            otables.append(entry[1])
-        for t in otables:
-            for o in t:
-                if "(DEPRECATED)" in o[3]:
-                    continue
-                if o[0]:
-                    options.append('-%s' % o[0])
-                options.append('--%s' % o[1])
-        ui.write("%s\n" % "\n".join(options))
-        return
-
-    cmdlist, unused_allcmds = cmdutil.findpossible(cmd, table)
-    if ui.verbose:
-        cmdlist = [' '.join(c[0]) for c in cmdlist.values()]
-    ui.write("%s\n" % "\n".join(sorted(cmdlist)))
-
 @command('debugdag',
     [('t', 'tags', None, _('use tags as labels')),
     ('b', 'branches', None, _('annotate with branch names')),