It seems that the testbot's generation of patch.diff failed, as it somehow managed to incorporate parts of my reply email into the file, corrupting it.

On Wed, Apr 17, 2019 at 4:11 PM Marvin <testbot@winehq.org> wrote:
Hi,

While running your changed tests, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?

Full results can be found at:
https://testbot.winehq.org/JobDetails.pl?Key=51069

Your paranoid android.


=== debian9 (build log) ===

error: corrupt patch at line 141
Task: Patch failed to apply

=== debian9 (build log) ===

error: corrupt patch at line 141
Task: Patch failed to apply