diff -r 9ac96b9fa76e -r 8f07f5a9c3de mercurial/worker.py
--- a/mercurial/worker.py	Tue Nov 03 09:56:02 2020 -0800
+++ b/mercurial/worker.py	Sat Nov 07 21:50:28 2020 -0800
@@ -300,7 +300,7 @@
     if status:
         if status < 0:
             os.kill(os.getpid(), -status)
-        sys.exit(status)
+        raise error.WorkerError(status)
     if hasretval:
         yield True, retval