diff -r dc3fe251de72 -r 6ada8a274b9c mercurial/manifest.py
--- a/mercurial/manifest.py	Sun Oct 27 20:16:59 2019 +0100
+++ b/mercurial/manifest.py	Tue Oct 29 10:41:30 2019 +0100
@@ -867,12 +867,15 @@
         return not self._dirs or all(m._isempty() for m in self._dirs.values())
 
     def __repr__(self):
-        return b'<treemanifest dir=%s, node=%s, loaded=%s, dirty=%s at 0x%x>' % (
-            self._dir,
-            hex(self._node),
-            bool(self._loadfunc is _noop),
-            self._dirty,
-            id(self),
+        return (
+            b'<treemanifest dir=%s, node=%s, loaded=%s, dirty=%s at 0x%x>'
+            % (
+                self._dir,
+                hex(self._node),
+                bool(self._loadfunc is _noop),
+                self._dirty,
+                id(self),
+            )
         )
 
     def dir(self):