diff -r f1f8b655da32 -r fb0de0bcd297 mercurial/cmdutil.py
--- a/mercurial/cmdutil.py	Fri May 11 00:53:29 2018 -0400
+++ b/mercurial/cmdutil.py	Thu May 10 21:53:48 2018 -0400
@@ -37,7 +37,6 @@
     patch,
     pathutil,
     pycompat,
-    registrar,
     revlog,
     rewriteutil,
     scmutil,
@@ -3151,12 +3150,6 @@
         if f in copied:
             repo.dirstate.copy(copied[f], f)
 
-class command(registrar.command):
-    """deprecated: used registrar.command instead"""
-    def _doregister(self, func, name, *args, **kwargs):
-        func._deprecatedregistrar = True  # flag for deprecwarn in extensions.py
-        return super(command, self)._doregister(func, name, *args, **kwargs)
-
 # a list of (ui, repo, otherpeer, opts, missing) functions called by
 # commands.outgoing.  "missing" is "missing" of the result of
 # "findcommonoutgoing()"