mercurial/lock.py

--- a/mercurial/lock.py	Thu Nov 07 03:59:22 2019 -0800
+++ b/mercurial/lock.py	Thu Nov 07 13:18:19 2019 -0500
@@ -238,7 +238,7 @@
     def __del__(self):
         if self.held:
             warnings.warn(
-                r"use lock.release instead of del lock",
+                "use lock.release instead of del lock",
                 category=DeprecationWarning,
                 stacklevel=2,
             )