Rollup merge of rust-lang#93658 - cchiw:issue-77443-fix, r=joshtriplett

Stabilize `#[cfg(panic = "...")]`

[Stabilization PR](https://rustc-dev-guide.rust-lang.org/stabilization_guide.html#stabilization-pr) for rust-lang#77443

compiler/rustc_feature/src/accepted.rs

@@ -70,6 +70,8 @@ declare_features! (
     (accepted, cfg_attr_multi, "1.33.0", Some(54881), None),
     /// Allows the use of `#[cfg(doctest)]`, set when rustdoc is collecting doctests.
     (accepted, cfg_doctest, "1.40.0", Some(62210), None),
+    /// Enables `#[cfg(panic = "...")]` config key.
+    (accepted, cfg_panic, "1.60.0", Some(77443), None),
     /// Allows `cfg(target_feature = "...")`.
     (accepted, cfg_target_feature, "1.27.0", Some(29717), None),
     /// Allows `cfg(target_vendor = "...")`.

compiler/rustc_feature/src/active.rs

@@ -306,8 +306,6 @@ declare_features! (
     (active, c_variadic, "1.34.0", Some(44930), None),
     /// Allows capturing disjoint fields in a closure/generator (RFC 2229).
     (incomplete, capture_disjoint_fields, "1.49.0", Some(53488), None),
-    /// Enables `#[cfg(panic = "...")]` config key.
-    (active, cfg_panic, "1.49.0", Some(77443), None),
     /// Allows the use of `#[cfg(sanitize = "option")]`; set when -Zsanitizer is used.
     (active, cfg_sanitize, "1.41.0", Some(39699), None),
     /// Allows `cfg(target_abi = "...")`.

compiler/rustc_feature/src/builtin_attrs.rs

@@ -34,7 +34,6 @@ const GATED_CFGS: &[GatedCfg] = &[
     (sym::target_has_atomic_load_store, sym::cfg_target_has_atomic, cfg_fn!(cfg_target_has_atomic)),
     (sym::sanitize, sym::cfg_sanitize, cfg_fn!(cfg_sanitize)),
     (sym::version, sym::cfg_version, cfg_fn!(cfg_version)),
-    (sym::panic, sym::cfg_panic, cfg_fn!(cfg_panic)),
 ];
 
 /// Find a gated cfg determined by the `pred`icate which is given the cfg's name.

library/core/tests/lib.rs

@@ -6,7 +6,7 @@
 #![feature(bool_to_option)]
 #![feature(box_syntax)]
 #![feature(cell_update)]
-#![feature(cfg_panic)]
+#![cfg_attr(bootstrap, feature(cfg_panic))]
 #![cfg_attr(bootstrap, feature(cfg_target_has_atomic))]
 #![feature(const_assume)]
 #![feature(const_black_box)]

src/test/ui/cfg/cfg-panic-abort.rs

@@ -1,7 +1,7 @@
 // build-pass
 // compile-flags: -C panic=abort
 // no-prefer-dynamic
-#![feature(cfg_panic)]
+
 
 #[cfg(panic = "unwind")]
 pub fn bad() -> i32 { }

src/test/ui/cfg/cfg-panic.rs

@@ -4,7 +4,7 @@
 // ignore-emscripten no panic_unwind implementation
 // ignore-wasm32     no panic_unwind implementation
 // ignore-wasm64     no panic_unwind implementation
-#![feature(cfg_panic)]
+
 
 #[cfg(panic = "abort")]
 pub fn bad() -> i32 { }

src/test/ui/fmt/format-args-capture.rs

@@ -1,5 +1,4 @@
 // run-pass
-#![feature(cfg_panic)]
 
 fn main() {
     named_argument_takes_precedence_to_captured();

src/test/ui/issues/issue-68696-catch-during-unwind.rs

@@ -4,7 +4,6 @@
 // entering the catch_unwind.
 //
 // run-pass
-#![feature(cfg_panic)]
 
 use std::panic::catch_unwind;