mercurial/extensions.py

--- a/mercurial/extensions.py	Sat Jul 15 20:31:52 2017 +0200
+++ b/mercurial/extensions.py	Sat Jul 15 14:16:54 2017 +0200
@@ -29,8 +29,15 @@
 _disabledextensions = {}
 _aftercallbacks = {}
 _order = []
-_builtin = {'hbisect', 'bookmarks', 'parentrevspec', 'progress', 'interhg',
-            'inotify', 'hgcia'}
+_builtin = {
+    'hbisect',
+    'bookmarks',
+    'parentrevspec',
+    'progress',
+    'interhg',
+    'inotify',
+    'hgcia'
+}
 
 def extensions(ui=None):
     if ui: