From eee01dd21138c376b1f64e49f7f76b9f6121c5ec Mon Sep 17 00:00:00 2001
From: Vincent Whitchurch <vincent.whitchurch@datadoghq.com>
Date: Thu, 26 Mar 2026 09:38:27 +0000
Subject: [PATCH] Add `IoSplit` diagnostic item for `std::io::Split`

Similar to the existing `IoLines` item.  It will be used in Clippy to
detect uses of `Split` leading to infinite loops similar to the existing
lint for `Lines`.
---
 library/std/src/io/mod.rs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/library/std/src/io/mod.rs b/library/std/src/io/mod.rs
index 623c34c6d2910..cba578cd3a6fa 100644
--- a/library/std/src/io/mod.rs
+++ b/library/std/src/io/mod.rs
@@ -3348,6 +3348,7 @@ impl SizeHint for &[u8] {
 /// [`split`]: BufRead::split
 #[stable(feature = "rust1", since = "1.0.0")]
 #[derive(Debug)]
+#[cfg_attr(not(test), rustc_diagnostic_item = "IoSplit")]
 pub struct Split<B> {
     buf: B,
     delim: u8,