From 4f4a6c641ca024bf35b37bcbd0336ca7801eb70c Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Sat, 26 Oct 2024 09:40:03 +0200
Subject: [PATCH] we can now enable the 'const stable fn must be stable' check

---
 std/src/sys/sync/condvar/no_threads.rs | 2 +-
 std/src/sys/sync/mutex/no_threads.rs   | 2 +-
 std/src/sys/sync/once/no_threads.rs    | 2 +-
 std/src/sys/sync/rwlock/no_threads.rs  | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/std/src/sys/sync/condvar/no_threads.rs b/std/src/sys/sync/condvar/no_threads.rs
index 36b89c5f5bef7..2a67ed766aa0c 100644
--- a/std/src/sys/sync/condvar/no_threads.rs
+++ b/std/src/sys/sync/condvar/no_threads.rs
@@ -5,7 +5,7 @@ pub struct Condvar {}
 
 impl Condvar {
     #[inline]
-    #[rustc_const_stable(feature = "const_locks", since = "1.63.0")]
+    #[cfg_attr(bootstrap, rustc_const_stable(feature = "const_locks", since = "1.63.0"))]
     pub const fn new() -> Condvar {
         Condvar {}
     }
diff --git a/std/src/sys/sync/mutex/no_threads.rs b/std/src/sys/sync/mutex/no_threads.rs
index 4a13c55fb8bec..7b243575e018e 100644
--- a/std/src/sys/sync/mutex/no_threads.rs
+++ b/std/src/sys/sync/mutex/no_threads.rs
@@ -10,7 +10,7 @@ unsafe impl Sync for Mutex {} // no threads on this platform
 
 impl Mutex {
     #[inline]
-    #[rustc_const_stable(feature = "const_locks", since = "1.63.0")]
+    #[cfg_attr(bootstrap, rustc_const_stable(feature = "const_locks", since = "1.63.0"))]
     pub const fn new() -> Mutex {
         Mutex { locked: Cell::new(false) }
     }
diff --git a/std/src/sys/sync/once/no_threads.rs b/std/src/sys/sync/once/no_threads.rs
index cdcffe790f54b..fb1b496510aba 100644
--- a/std/src/sys/sync/once/no_threads.rs
+++ b/std/src/sys/sync/once/no_threads.rs
@@ -35,7 +35,7 @@ unsafe impl Sync for Once {}
 
 impl Once {
     #[inline]
-    #[rustc_const_stable(feature = "const_once_new", since = "1.32.0")]
+    #[cfg_attr(bootstrap, rustc_const_stable(feature = "const_once_new", since = "1.32.0"))]
     pub const fn new() -> Once {
         Once { state: Cell::new(State::Incomplete) }
     }
diff --git a/std/src/sys/sync/rwlock/no_threads.rs b/std/src/sys/sync/rwlock/no_threads.rs
index 789ef9b29e52a..6965e2e2cabe5 100644
--- a/std/src/sys/sync/rwlock/no_threads.rs
+++ b/std/src/sys/sync/rwlock/no_threads.rs
@@ -10,7 +10,7 @@ unsafe impl Sync for RwLock {} // no threads on this platform
 
 impl RwLock {
     #[inline]
-    #[rustc_const_stable(feature = "const_locks", since = "1.63.0")]
+    #[cfg_attr(bootstrap, rustc_const_stable(feature = "const_locks", since = "1.63.0"))]
     pub const fn new() -> RwLock {
         RwLock { mode: Cell::new(0) }
     }