Rollup merge of rust-lang#115449 - scottmcm:stable-const-is-ascii, r=ChrisDenton

Const-stabilize `is_ascii`

Resolves rust-lang#111090

FCP completed in rust-lang#111090 (comment)

Author: matthiaskrgr

library/core/src/lib.rs

@@ -152,7 +152,6 @@
 #![feature(const_slice_from_raw_parts_mut)]
 #![feature(const_slice_from_ref)]
 #![feature(const_slice_index)]
-#![feature(const_slice_is_ascii)]
 #![feature(const_slice_ptr_len)]
 #![feature(const_slice_split_at_mut)]
 #![feature(const_str_from_utf8_unchecked_mut)]

library/core/src/slice/ascii.rs

@@ -10,7 +10,7 @@ use crate::ops;
 impl [u8] {
     /// Checks if all bytes in this slice are within the ASCII range.
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
-    #[rustc_const_unstable(feature = "const_slice_is_ascii", issue = "111090")]
+    #[rustc_const_stable(feature = "const_slice_is_ascii", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     #[inline]
     pub const fn is_ascii(&self) -> bool {

library/core/src/str/mod.rs

@@ -2322,7 +2322,7 @@ impl str {
     /// assert!(!non_ascii.is_ascii());
     /// ```
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
-    #[rustc_const_unstable(feature = "const_slice_is_ascii", issue = "111090")]
+    #[rustc_const_stable(feature = "const_slice_is_ascii", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     #[inline]
     pub const fn is_ascii(&self) -> bool {