Stabilize const_vec_string_slice

This feature was approved for stabilization in
#129041 (comment)
so this change stabilizes it.

Author: Kixunil

library/alloc/src/string.rs

@@ -1059,7 +1059,7 @@ impl String {
     #[inline]
     #[must_use = "`self` will be dropped if the result is not used"]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     pub const fn into_bytes(self) -> Vec<u8> {
         self.vec
     }
@@ -1077,7 +1077,7 @@ impl String {
     #[must_use]
     #[stable(feature = "string_as_str", since = "1.7.0")]
     #[cfg_attr(not(test), rustc_diagnostic_item = "string_as_str")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     pub const fn as_str(&self) -> &str {
         // SAFETY: String contents are stipulated to be valid UTF-8, invalid contents are an error
         // at construction.
@@ -1175,7 +1175,7 @@ impl String {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     pub const fn capacity(&self) -> usize {
         self.vec.capacity()
     }
@@ -1441,7 +1441,7 @@ impl String {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     pub const fn as_bytes(&self) -> &[u8] {
         self.vec.as_slice()
     }
@@ -1817,7 +1817,7 @@ impl String {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     #[rustc_confusables("length", "size")]
     pub const fn len(&self) -> usize {
         self.vec.len()
@@ -1837,7 +1837,7 @@ impl String {
     #[inline]
     #[must_use]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     pub const fn is_empty(&self) -> bool {
         self.len() == 0
     }

library/alloc/src/vec/mod.rs

@@ -1242,7 +1242,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     pub const fn capacity(&self) -> usize {
         self.buf.capacity()
     }
@@ -1557,7 +1557,7 @@ impl<T, A: Allocator> Vec<T, A> {
     #[inline]
     #[stable(feature = "vec_as_slice", since = "1.7.0")]
     #[cfg_attr(not(test), rustc_diagnostic_item = "vec_as_slice")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     pub const fn as_slice(&self) -> &[T] {
         // SAFETY: `slice::from_raw_parts` requires pointee is a contiguous, aligned buffer of size
         // `len` containing properly-initialized `T`s. Data must not be mutated for the returned
@@ -1661,7 +1661,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// [`as_ptr`]: Vec::as_ptr
     /// [`as_non_null`]: Vec::as_non_null
     #[stable(feature = "vec_as_ptr", since = "1.37.0")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     #[rustc_never_returns_null_ptr]
     #[rustc_as_ptr]
     #[inline]
@@ -2675,7 +2675,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// ```
     #[inline]
     #[stable(feature = "rust1", since = "1.0.0")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     #[rustc_confusables("length", "size")]
     pub const fn len(&self) -> usize {
         let len = self.len;
@@ -2701,7 +2701,7 @@ impl<T, A: Allocator> Vec<T, A> {
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     #[cfg_attr(not(test), rustc_diagnostic_item = "vec_is_empty")]
-    #[rustc_const_unstable(feature = "const_vec_string_slice", issue = "129041")]
+    #[rustc_const_stable(feature = "const_vec_string_slice", since = "TBD")]
     pub const fn is_empty(&self) -> bool {
         self.len() == 0
     }