tests/test-gendoc-el.t

rust-dirstate: use EntryState enum instead of literals

This improves code readability quite a bit, while also adding a layer of
safety because we're checking the state byte against the enum.

Differential Revision: https://phab.mercurial-scm.org/D6629

#require docutils gettext

  $ $TESTDIR/check-gendoc el
  checking for parse errors