2 files changed, 19 insertions, 1 deletions
diff --git a/library/core/tests/iter/range.rs b/library/core/tests/iter/range.rs
index 0a77ecddb84..5b87d6c1fa0 100644
--- a/library/core/tests/iter/range.rs
+++ b/library/core/tests/iter/range.rs
@@ -1,5 +1,6 @@
-use core::num::NonZeroUsize;
 use super::*;
+use core::ascii::Char as AsciiChar;
+use core::num::NonZeroUsize;
 
 #[test]
 fn test_range() {
@@ -40,6 +41,21 @@ fn test_char_range() {
 }
 
 #[test]
+fn test_ascii_char_range() {
+    let from = AsciiChar::Null;
+    let to = AsciiChar::Delete;
+    assert!((from..=to).eq((from as u8..=to as u8).filter_map(AsciiChar::from_u8)));
+    assert!((from..=to).rev().eq((from as u8..=to as u8).filter_map(AsciiChar::from_u8).rev()));
+
+    assert_eq!((AsciiChar::CapitalA..=AsciiChar::CapitalZ).count(), 26);
+    assert_eq!((AsciiChar::CapitalA..=AsciiChar::CapitalZ).size_hint(), (26, Some(26)));
+    assert_eq!((AsciiChar::SmallA..=AsciiChar::SmallZ).count(), 26);
+    assert_eq!((AsciiChar::SmallA..=AsciiChar::SmallZ).size_hint(), (26, Some(26)));
+    assert_eq!((AsciiChar::Digit0..=AsciiChar::Digit9).count(), 10);
+    assert_eq!((AsciiChar::Digit0..=AsciiChar::Digit9).size_hint(), (10, Some(10)));
+}
+
+#[test]
 fn test_range_exhaustion() {
     let mut r = 10..10;
     assert!(r.is_empty());
diff --git a/library/core/tests/lib.rs b/library/core/tests/lib.rs
index d849561bb21..aac9250aa4f 100644
--- a/library/core/tests/lib.rs
+++ b/library/core/tests/lib.rs
@@ -2,6 +2,8 @@
 #![feature(array_chunks)]
 #![feature(array_methods)]
 #![feature(array_windows)]
+#![feature(ascii_char)]
+#![feature(ascii_char_variants)]
 #![feature(bigint_helper_methods)]
 #![feature(cell_update)]
 #![feature(const_align_offset)]