D7322: index: add a `has_node` method (API)

[martinvonz (Martin von Zweigbergk)]

martinvonz added a comment.


  I think this needs to update the version number in `mercurial/cext/parsers.c` and in `mercurial/policy.py`. That will make hg fall back to pure code if it doesn't find the right version of the C code, making updating across this commit easier.

REPOSITORY
  rHG Mercurial

CHANGES SINCE LAST ACTION
  https://phab.mercurial-scm.org/D7322/new/

REVISION DETAIL
  https://phab.mercurial-scm.org/D7322

To: marmoute, indygreg, #hg-reviewers
Cc: martinvonz, mercurial-devel