--- a/mercurial/repocache.py	Tue Oct 08 15:15:37 2019 -0700
+++ b/mercurial/repocache.py	Tue Oct 08 15:06:18 2019 -0700
@@ -70,7 +70,7 @@
         """
         if self._thread and self._thread.is_alive():
             raise error.ProgrammingError(
-                b'cannot obtain cached repo while ' b'loader is active'
+                b'cannot obtain cached repo while loader is active'
             )
         return self._cache.peek(path, None)