From e652f97c6b71d485473c98bb0e5be1328db9bc45 Mon Sep 17 00:00:00 2001
From: Christian Poveda <christian.poveda@ferrous-systems.com>
Date: Fri, 12 Sep 2025 11:10:45 -0500
Subject: [PATCH] Improve `core::ascii` coverage

---
 library/coretests/tests/ascii.rs | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/library/coretests/tests/ascii.rs b/library/coretests/tests/ascii.rs
index ce09ee507f11f..297aa114e006d 100644
--- a/library/coretests/tests/ascii.rs
+++ b/library/coretests/tests/ascii.rs
@@ -505,3 +505,10 @@ fn test_escape_ascii_iter() {
     let _ = it.advance_back_by(4);
     assert_eq!(it.to_string(), r#"fastpath\xffremainder"#);
 }
+
+#[test]
+fn test_invalid_u8() {
+    for c in 128..=255 {
+        assert_eq!(core::ascii::Char::from_u8(c), None);
+    }
+}