From d92c600dc7b063e217d8f860e78d2c6e809f4d7e Mon Sep 17 00:00:00 2001
From: Andrew Wock <ajwock@gmail.com>
Date: Tue, 5 Mar 2024 14:40:31 -0500
Subject: [PATCH] Extra test

---
 library/core/tests/mem.rs | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/library/core/tests/mem.rs b/library/core/tests/mem.rs
index e1c342f0f3e89..cf7b3856e54bb 100644
--- a/library/core/tests/mem.rs
+++ b/library/core/tests/mem.rs
@@ -451,6 +451,26 @@ fn uninit_fill_from_partial() {
     assert_eq!(remainder.len(), 16);
 }
 
+#[test]
+fn uninit_over_fill() {
+    let mut dst = [MaybeUninit::new(255); 64];
+    let src = [0; 72];
+
+    let (initted, remainder) = MaybeUninit::fill_from(&mut dst, src.into_iter());
+    assert_eq!(initted, &src[0..64]);
+    assert_eq!(remainder.len(), 0);
+}
+
+#[test]
+fn uninit_empty_fill() {
+    let mut dst = [MaybeUninit::new(255); 64];
+    let src = [0; 0];
+
+    let (initted, remainder) = MaybeUninit::fill_from(&mut dst, src.into_iter());
+    assert_eq!(initted, &src[0..0]);
+    assert_eq!(remainder.len(), 64);
+}
+
 #[test]
 #[cfg(panic = "unwind")]
 fn uninit_fill_from_mid_panic() {