tests/test-gendoc-zh_TW.t

rust: Keep lazily-initialized Changelog and Manifest log on the Repo object

That way if one of them is accessed multiple times it won’t be reopened
from the filesystem.

Differential Revision: https://phab.mercurial-scm.org/D11406

#require docutils gettext

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