diff -r 09537caa87f9 -r 40bf3d7ecc42 mercurial/error.py
--- a/mercurial/error.py	Mon Nov 04 16:04:09 2019 +0100
+++ b/mercurial/error.py	Mon Nov 04 16:13:01 2019 +0100
@@ -111,6 +111,9 @@
 
     __bytes__ = _tobytes
 
+    def __str__(self):
+        return pycompat.sysstr(self.__bytes__())
+
 
 class HookLoadError(Abort):
     """raised when loading a hook fails, aborting an operation