--- a/mercurial/extensions.py	Sat Jul 15 14:16:54 2017 +0200
+++ b/mercurial/extensions.py	Sat Jul 15 14:17:35 2017 +0200
@@ -32,6 +32,7 @@
 _builtin = {
     'hbisect',
     'bookmarks',
+    'color',
     'parentrevspec',
     'progress',
     'interhg',