diff -r 6da22a068281 -r 64faa55716f4 mercurial/error.py
--- a/mercurial/error.py	Mon Nov 23 11:30:43 2020 -0800
+++ b/mercurial/error.py	Mon Nov 23 11:56:10 2020 -0800
@@ -137,6 +137,10 @@
 
     def __init__(self, status_code):
         self.status_code = status_code
+        # Pass status code to superclass just so it becomes part of __bytes__
+        super(WorkerError, self).__init__(status_code)
+
+    __bytes__ = _tobytes
 
 
 class InterventionRequired(Hint, Exception):