diff --git a/mercurial/thirdparty/attr/_make.py b/mercurial/thirdparty/attr/_make.py
--- a/mercurial/thirdparty/attr/_make.py
+++ b/mercurial/thirdparty/attr/_make.py
@@ -56,7 +56,7 @@
 def attr(default=NOTHING, validator=None,
          repr=True, cmp=True, hash=None, init=True,
          convert=None, metadata={}):
-    """
+    r"""
     Create a new attribute on a class.
 
     ..  warning::
diff --git a/mercurial/thirdparty/attr/filters.py b/mercurial/thirdparty/attr/filters.py
--- a/mercurial/thirdparty/attr/filters.py
+++ b/mercurial/thirdparty/attr/filters.py
@@ -19,7 +19,7 @@
 
 
 def include(*what):
-    """
+    r"""
     Whitelist *what*.
 
     :param what: What to whitelist.
@@ -36,7 +36,7 @@
 
 
 def exclude(*what):
-    """
+    r"""
     Blacklist *what*.
 
     :param what: What to blacklist.