diff -r 47fac1692ede -r 9f70512ae2cf mercurial/lsprof.py
--- a/mercurial/lsprof.py	Sun Nov 10 07:30:14 2019 -0800
+++ b/mercurial/lsprof.py	Fri Nov 08 11:19:20 2019 -0800
@@ -135,9 +135,9 @@
                 mname = _fn2mod[code.co_filename] = k
                 break
         else:
-            mname = _fn2mod[code.co_filename] = r'<%s>' % code.co_filename
+            mname = _fn2mod[code.co_filename] = '<%s>' % code.co_filename
 
-    res = r'%s:%d(%s)' % (mname, code.co_firstlineno, code.co_name)
+    res = '%s:%d(%s)' % (mname, code.co_firstlineno, code.co_name)
 
     if sys.version_info.major >= 3:
         res = res.encode('latin-1')