Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|From 754f493ef44d4a0f7b59e8c95e50b911631ac60b Mon Sep 17 00:00:00 2001
|From: ysl2 <www.songli.yu@gmail.com>
|Date: Sun, 29 Oct 2023 15:40:44 +0800
|Subject: [PATCH] Bulk kill: arg.ui == 0 for normal kill current client; arg.ui
| == 1 for kill other clients in current tag (except current focusing client);
| arg.ui == 2 for kill all clients in current tag (include focusing client).
|
|---
| bulkill.c    | 36 ++++++++++++++++++++++++++++++++++++
| config.def.h |  3 +++
| 2 files changed, 39 insertions(+)
| create mode 100644 bulkill.c
|
|diff --git a/bulkill.c b/bulkill.c
|new file mode 100644
|index 0000000..c73958f
|--- /dev/null
|+++ b/bulkill.c
--------------------------
(Creating file bulkill.c...)
Patching file bulkill.c using Plan A...
Empty context always matches.
Hunk #1 succeeded at 1.
Hmm...  The next patch looks like a unified diff to me...
The text leading up to this was:
--------------------------
|diff --git a/config.def.h b/config.def.h
|index 750529d..4d4bcef 100644
|--- a/config.def.h
|+++ b/config.def.h
--------------------------
Patching file config.def.h using Plan A...
Hunk #1 succeeded at 60 (offset -5 lines).
Hunk #2 succeeded at 75 (offset -5 lines).
Hmm...  Ignoring the trailing garbage.
done