--- a/mercurial/policy.py	Thu Nov 07 03:59:22 2019 -0800
+++ b/mercurial/policy.py	Thu Nov 07 13:18:19 2019 -0500
@@ -154,4 +154,4 @@
     except AttributeError:
         if _isrustpermissive():
             return default
-        raise ImportError(r"Cannot import name %s" % member)
+        raise ImportError("Cannot import name %s" % member)