Rollup merge of rust-lang#132511 - RalfJung:const_arguments_as_str, r=dtolnay

stabilize const_arguments_as_str

FCP passed in the [tracking issue](rust-lang#103900 (comment)).

Author: workingjubilee

library/core/src/fmt/mod.rs

@@ -438,10 +438,9 @@ impl<'a> Arguments<'a> {
     /// assert_eq!(format_args!("{:?}", std::env::current_dir()).as_str(), None);
     /// ```
     #[stable(feature = "fmt_as_str", since = "1.52.0")]
-    #[rustc_const_unstable(feature = "const_arguments_as_str", issue = "103900")]
+    #[rustc_const_stable(feature = "const_arguments_as_str", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     #[inline]
-    #[cfg_attr(not(bootstrap), rustc_const_stable_indirect)]
     pub const fn as_str(&self) -> Option<&'static str> {
         match (self.pieces, self.args) {
             ([], []) => Some(""),

library/core/src/lib.rs

@@ -114,7 +114,6 @@
 #![feature(const_align_of_val_raw)]
 #![feature(const_align_offset)]
 #![feature(const_alloc_layout)]
-#![feature(const_arguments_as_str)]
 #![feature(const_array_into_iter_constructors)]
 #![feature(const_bigint_helper_methods)]
 #![feature(const_black_box)]

library/core/src/panic/panic_info.rs

@@ -165,10 +165,9 @@ impl<'a> PanicMessage<'a> {
     ///
     /// See [`fmt::Arguments::as_str`] for details.
     #[stable(feature = "panic_info_message", since = "1.81.0")]
-    #[rustc_const_unstable(feature = "const_arguments_as_str", issue = "103900")]
+    #[rustc_const_stable(feature = "const_arguments_as_str", since = "CURRENT_RUSTC_VERSION")]
     #[must_use]
     #[inline]
-    #[cfg_attr(not(bootstrap), rustc_const_stable_indirect)]
     pub const fn as_str(&self) -> Option<&'static str> {
         self.message.as_str()
     }