Move various ui const tests to `library`

Move:
 - `src\test\ui\consts\const-nonzero.rs` to `library\core`
 - `src\test\ui\consts\ascii.rs` to `library\core`
 - `src\test\ui\consts\cow-is-borrowed` to `library\alloc`

Part of #76268

1 files changed, 11 insertions, 0 deletions

diff --git a/library/core/tests/ascii.rs b/library/core/tests/ascii.rs
index 0b975083947..3244bbc2d67 100644
--- a/library/core/tests/ascii.rs
+++ b/library/core/tests/ascii.rs
@@ -397,3 +397,14 @@ fn test_is_ascii_align_size_thoroughly() {
         }
     }
 }
+
+#[test]
+fn ascii_const() {
+    // test that the `is_ascii` methods of `char` and `u8` are usable in a const context
+
+    const CHAR_IS_ASCII: bool = 'a'.is_ascii();
+    assert!(CHAR_IS_ASCII);
+
+    const BYTE_IS_ASCII: bool = 97u8.is_ascii();
+    assert!(BYTE_IS_ASCII);
+}