Rollup merge of rust-lang#122291 - lilasta:stabilize_const_location_fields, r=dtolnay

Stabilize `const_caller_location` and `const_location_fields`

Closes rust-lang#102911. Closes rust-lang#76156.

tests: [library/core/tests/panic/location.rs](https://github.com/rust-lang/rust/blob/3521a2f2f317cb978063842485c7d1bc86ec82b6/library/core/tests/panic/location.rs)

API:
```rust
// core::panic::location
impl Location {
    pub const fn caller() -> &'static Location<'static>;
    pub const fn file(&self) -> &str;
    pub const fn line(&self) -> u32;
    pub const fn column(&self) -> u32;
}
```

Author: matthiaskrgr

core/src/intrinsics.rs

@@ -1128,7 +1128,7 @@ extern "rust-intrinsic" {
     /// any safety invariants.
     ///
     /// Consider using [`core::panic::Location::caller`] instead.
-    #[rustc_const_unstable(feature = "const_caller_location", issue = "76156")]
+    #[rustc_const_stable(feature = "const_caller_location", since = "CURRENT_RUSTC_VERSION")]
     #[rustc_safe_intrinsic]
     #[rustc_nounwind]
     pub fn caller_location() -> &'static crate::panic::Location<'static>;

core/src/lib.rs

@@ -125,7 +125,6 @@
 #![feature(const_array_into_iter_constructors)]
 #![feature(const_bigint_helper_methods)]
 #![feature(const_black_box)]
-#![feature(const_caller_location)]
 #![feature(const_cell_into_inner)]
 #![feature(const_char_from_u32_unchecked)]
 #![feature(const_eval_select)]

core/src/panic/location.rs

@@ -81,7 +81,7 @@ impl<'a> Location<'a> {
     /// ```
     #[must_use]
     #[stable(feature = "track_caller", since = "1.46.0")]
-    #[rustc_const_unstable(feature = "const_caller_location", issue = "76156")]
+    #[rustc_const_stable(feature = "const_caller_location", since = "CURRENT_RUSTC_VERSION")]
     #[track_caller]
     #[inline]
     pub const fn caller() -> &'static Location<'static> {
@@ -123,7 +123,7 @@ impl<'a> Location<'a> {
     /// ```
     #[must_use]
     #[stable(feature = "panic_hooks", since = "1.10.0")]
-    #[rustc_const_unstable(feature = "const_location_fields", issue = "102911")]
+    #[rustc_const_stable(feature = "const_location_fields", since = "CURRENT_RUSTC_VERSION")]
     #[inline]
     pub const fn file(&self) -> &str {
         self.file
@@ -148,7 +148,7 @@ impl<'a> Location<'a> {
     /// ```
     #[must_use]
     #[stable(feature = "panic_hooks", since = "1.10.0")]
-    #[rustc_const_unstable(feature = "const_location_fields", issue = "102911")]
+    #[rustc_const_stable(feature = "const_location_fields", since = "CURRENT_RUSTC_VERSION")]
     #[inline]
     pub const fn line(&self) -> u32 {
         self.line
@@ -173,7 +173,7 @@ impl<'a> Location<'a> {
     /// ```
     #[must_use]
     #[stable(feature = "panic_col", since = "1.25.0")]
-    #[rustc_const_unstable(feature = "const_location_fields", issue = "102911")]
+    #[rustc_const_stable(feature = "const_location_fields", since = "CURRENT_RUSTC_VERSION")]
     #[inline]
     pub const fn column(&self) -> u32 {
         self.col

core/tests/lib.rs

@@ -11,7 +11,6 @@
 #![feature(const_align_offset)]
 #![feature(const_align_of_val_raw)]
 #![feature(const_black_box)]
-#![feature(const_caller_location)]
 #![feature(const_cell_into_inner)]
 #![feature(const_hash)]
 #![feature(const_heap)]
@@ -25,7 +24,6 @@
 #![cfg_attr(not(bootstrap), feature(const_three_way_compare))]
 #![feature(const_trait_impl)]
 #![feature(const_likely)]
-#![feature(const_location_fields)]
 #![feature(core_intrinsics)]
 #![feature(core_io_borrowed_buf)]
 #![feature(core_private_bignum)]