I'm using a very recent build from git: 0a49f158f15. I see diff-mode
being broken in 2 ways.

I'm attaching a diff file, produced by C-x v D in a project using
subversion (then cut down and de-contented).

Breakage 1:

  1. emacs -Q /tmp/tst.patch
  2. M-k

I would expect this to kill the first hunk. Instead emacs barfs:
Args out of range: something something


Breakage 2:

  1. emacs -Q /tmp/tst.patch
  2. M-g g 13 RET     move point to the start of the 2nd hunk
  3. M-k              I would expect this to kill the hunk at point (2nd
                      hunk). I would then expect the point to remain at
                      the 2nd hunk
  4. M-k              Same as before. Should kill 2nd hunk
  5. M-k              Same as before. Should kill 2nd hunk

Instead, M-k #2 kills the 2nd hunk and then moves the point to the 1st
hunk. So that subsequent M-k #3 kills the 1st hunk.