Rollup merge of #143383 - fee1-dead-contrib:push-mstmlwuskxyy, r=dtolnay

stabilize `const_array_each_ref`

cc #133289, needs FCP.

Author: jhpratt

library/core/src/array/mod.rs

@@ -621,11 +621,11 @@ impl<T, const N: usize> [T; N] {
     /// assert_eq!(strings.len(), 3);
     /// ```
     #[stable(feature = "array_methods", since = "1.77.0")]
-    #[rustc_const_unstable(feature = "const_array_each_ref", issue = "133289")]
+    #[rustc_const_stable(feature = "const_array_each_ref", since = "CURRENT_RUSTC_VERSION")]
     pub const fn each_ref(&self) -> [&T; N] {
         let mut buf = [null::<T>(); N];
 
-        // FIXME(const-hack): We would like to simply use iterators for this (as in the original implementation), but this is not allowed in constant expressions.
+        // FIXME(const_trait_impl): We would like to simply use iterators for this (as in the original implementation), but this is not allowed in constant expressions.
         let mut i = 0;
         while i < N {
             buf[i] = &raw const self[i];
@@ -652,11 +652,11 @@ impl<T, const N: usize> [T; N] {
     /// assert_eq!(floats, [0.0, 2.7, -1.0]);
     /// ```
     #[stable(feature = "array_methods", since = "1.77.0")]
-    #[rustc_const_unstable(feature = "const_array_each_ref", issue = "133289")]
+    #[rustc_const_stable(feature = "const_array_each_ref", since = "CURRENT_RUSTC_VERSION")]
     pub const fn each_mut(&mut self) -> [&mut T; N] {
         let mut buf = [null_mut::<T>(); N];
 
-        // FIXME(const-hack): We would like to simply use iterators for this (as in the original implementation), but this is not allowed in constant expressions.
+        // FIXME(const_trait_impl): We would like to simply use iterators for this (as in the original implementation), but this is not allowed in constant expressions.
         let mut i = 0;
         while i < N {
             buf[i] = &raw mut self[i];