diff -r defabf63e969 -r 8ff1ecfadcd1 mercurial/keepalive.py
--- a/mercurial/keepalive.py	Tue Oct 08 15:15:37 2019 -0700
+++ b/mercurial/keepalive.py	Tue Oct 08 15:06:18 2019 -0700
@@ -296,7 +296,7 @@
             # a DIFFERENT exception
             if DEBUG:
                 DEBUG.error(
-                    b"unexpected exception - closing " b"connection to %s (%d)",
+                    b"unexpected exception - closing connection to %s (%d)",
                     host,
                     id(h),
                 )