mercurial/pure/parsers.py

--- a/mercurial/pure/parsers.py	Fri Jul 20 09:53:54 2018 -0700
+++ b/mercurial/pure/parsers.py	Fri Jul 20 10:02:05 2018 -0700
@@ -48,8 +48,6 @@
     def _fix_index(self, i):
         if not isinstance(i, int):
             raise TypeError("expecting int indexes")
-        if i < 0:
-            i = len(self) + i
         if i < 0 or i >= len(self):
             raise IndexError
         return i