From 91fe6f9343a384dd7d598705a4bc4b137845dbea Mon Sep 17 00:00:00 2001
From: joboet <jonasboettiger@icloud.com>
Date: Thu, 11 Apr 2024 18:33:46 +0200
Subject: core: panic on overflow in `BorrowedCursor`

---
 library/std/src/io/tests.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

(limited to 'library/std/src')

diff --git a/library/std/src/io/tests.rs b/library/std/src/io/tests.rs
index eb5d5988768..090a091b09a 100644
--- a/library/std/src/io/tests.rs
+++ b/library/std/src/io/tests.rs
@@ -209,6 +209,15 @@ fn read_buf_exact() {
     assert_eq!(c.read_buf_exact(buf.unfilled()).unwrap_err().kind(), io::ErrorKind::UnexpectedEof);
 }
 
+#[test]
+#[should_panic]
+fn borrowed_cursor_advance_overflow() {
+    let mut buf = [0; 512];
+    let mut buf = BorrowedBuf::from(&mut buf[..]);
+    buf.unfilled().advance(1);
+    buf.unfilled().advance(usize::MAX);
+}
+
 #[test]
 fn take_eof() {
     struct R;
-- 
cgit 1.4.1-3-g733a5