tests/test-issue433.t

import: --no-commit should update .hg/last-message.txt

The patch parser goes through all of that trouble extracting the
commit message from the patch file.  It seems such a waste not to
use it.

http://mercurial.selenic.com/bts/issue433

  $ hg init
  $ echo a > a
  $ hg commit -Ama
  adding a

  $ hg parents -r 0 doesnotexist
  abort: 'doesnotexist' not found in manifest!
  [255]