Rollup merge of rust-lang#132153 - bjoernager:const-char-encode-utf16…

…, r=dtolnay

Stabilise `const_char_encode_utf16`.

Closes: rust-lang#130660

This PR stabilises the `const_char_encode_utf16` feature gate (i.e. support for `char::encode_utf16` in constant expressions).

~~Note that the linked tracking issue is as of this writing currently awaiting FCP until 2024-11-02.~~

library/core/src/char/methods.rs

@@ -711,7 +711,7 @@ impl char {
     /// '𝕊'.encode_utf16(&mut b);
     /// ```
     #[stable(feature = "unicode_encode_char", since = "1.15.0")]
-    #[rustc_const_unstable(feature = "const_char_encode_utf16", issue = "130660")]
+    #[rustc_const_stable(feature = "const_char_encode_utf16", since = "CURRENT_RUSTC_VERSION")]
     #[inline]
     pub const fn encode_utf16(self, dst: &mut [u16]) -> &mut [u16] {
         encode_utf16_raw(self as u32, dst)
@@ -1819,7 +1819,10 @@ pub const fn encode_utf8_raw(code: u32, dst: &mut [u8]) -> &mut [u8] {
 /// Panics if the buffer is not large enough.
 /// A buffer of length 2 is large enough to encode any `char`.
 #[unstable(feature = "char_internals", reason = "exposed only for libstd", issue = "none")]
-#[rustc_const_unstable(feature = "const_char_encode_utf16", issue = "130660")]
+#[cfg_attr(
+    bootstrap,
+    rustc_const_stable(feature = "const_char_encode_utf16", since = "CURRENT_RUSTC_VERSION")
+)]
 #[doc(hidden)]
 #[inline]
 pub const fn encode_utf16_raw(mut code: u32, dst: &mut [u16]) -> &mut [u16] {

library/core/src/lib.rs

@@ -114,7 +114,6 @@
 #![feature(const_align_of_val_raw)]
 #![feature(const_alloc_layout)]
 #![feature(const_black_box)]
-#![feature(const_char_encode_utf16)]
 #![feature(const_eval_select)]
 #![feature(const_exact_div)]
 #![feature(const_float_methods)]