index: drop support for negative indexes into the index I want index[i] to work for any valid revnum including -1 (as it already does), and I also want len(index) to be the number of revisions in the index (not counting the null revision), so it cannot also support negative revision numbers other than -1 for nullid. I didn't bother removing support for it from revlog v0. Differential Revision: https://phab.mercurial-scm.org/D4019

--- 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