From 89da2979a5d05ec50f4a221a2faa0dcbbd26fa73 Mon Sep 17 00:00:00 2001
From: Barrett <contact@barretts.club>
Date: Tue, 8 Oct 2024 17:05:10 -0500
Subject: [PATCH] diagnostics: lists should use the Oxford comma

we encountered this in https://github.com/rust-lang/rust/pull/131038

kinda felt like an unspoken rule so here's a more concrete
clarification.
---
 src/diagnostics.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/diagnostics.md b/src/diagnostics.md
index 5b6d1323f..ddcaa8f33 100644
--- a/src/diagnostics.md
+++ b/src/diagnostics.md
@@ -156,6 +156,8 @@ use an error-level lint instead of a fixed error.
   compiler messages are an important learning tool.
 - When talking about the compiler, call it `the compiler`, not `Rust` or
   `rustc`.
+- Use the [Oxford comma](https://en.wikipedia.org/wiki/Serial_comma) when
+  writing lists of items.
 
 ### Lint naming