--- a/mercurial/hgweb/request.py	Tue Oct 08 15:15:37 2019 -0700
+++ b/mercurial/hgweb/request.py	Tue Oct 08 15:06:18 2019 -0700
@@ -516,7 +516,7 @@
 
             if self._bodygen is not None or self._bodywillwrite:
                 raise error.ProgrammingError(
-                    b"must use setbodybytes('') with " b"304 responses"
+                    b"must use setbodybytes('') with 304 responses"
                 )
 
         # Various HTTP clients (notably httplib) won't read the HTTP response