2 files changed, 2 insertions, 0 deletions
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 9334c833bb6..63ee6c521d7 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -347,6 +347,7 @@
 #![feature(stdsimd)]
 #![feature(test)]
 #![feature(trace_macros)]
+#![feature(get_many_mut)]
 //
 // Only used in tests/benchmarks:
 //
diff --git a/library/std/src/sys_common/once/generic.rs b/library/std/src/sys_common/once/generic.rs
index acf5f247164..d953a674592 100644
--- a/library/std/src/sys_common/once/generic.rs
+++ b/library/std/src/sys_common/once/generic.rs
@@ -107,6 +107,7 @@ struct WaiterQueue<'a> {
 
 impl Once {
     #[inline]
+    #[rustc_const_stable(feature = "const_once_new", since = "1.32.0")]
     pub const fn new() -> Once {
         Once { state_and_queue: AtomicPtr::new(ptr::invalid_mut(INCOMPLETE)) }
     }