Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From b7f2e9e933710e3339b710e24e37c6f0b3befa34 Mon Sep 17 00:00:00 2001
|From: Matthias Schoth <mschoth@gmail.com>
|Date: Fri, 24 Jul 2020 23:55:31 +0200
|Subject: [PATCH] visualbell
|
|---
| x.c | 11 ++++++++++-
| 1 file changed, 10 insertions(+), 1 deletion(-)
|
|diff --git a/x.c b/x.c
|index 210f184..bcf61f1 100644
|--- a/x.c
|+++ b/x.c
--------------------------
Patching file x.c using Plan A...
Hunk #1 succeeded at 253.
Hunk #2 succeeded at 1714.
Hunk #3 succeeded at 1961.
Hmm...  Ignoring the trailing garbage.
done