diff --git a/library/core/src/num/int_macros.rs b/library/core/src/num/int_macros.rs
index 6a403542dd23..37562da3cd6b 100644
--- a/library/core/src/num/int_macros.rs
+++ b/library/core/src/num/int_macros.rs
@@ -173,14 +173,13 @@ pub const fn trailing_ones(self) -> u32 {
         /// # Examples
         ///
         /// ```
-        /// #![feature(isolate_most_least_significant_one)]
-        ///
         #[doc = concat!("let n: ", stringify!($SelfT), " = 0b_01100100;")]
         ///
         /// assert_eq!(n.isolate_highest_one(), 0b_01000000);
         #[doc = concat!("assert_eq!(0_", stringify!($SelfT), ".isolate_highest_one(), 0);")]
         /// ```
-        #[unstable(feature = "isolate_most_least_significant_one", issue = "136909")]
+        #[stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
+        #[rustc_const_stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
@@ -194,14 +193,13 @@ pub const fn isolate_highest_one(self) -> Self {
         /// # Examples
         ///
         /// ```
-        /// #![feature(isolate_most_least_significant_one)]
-        ///
         #[doc = concat!("let n: ", stringify!($SelfT), " = 0b_01100100;")]
         ///
         /// assert_eq!(n.isolate_lowest_one(), 0b_00000100);
         #[doc = concat!("assert_eq!(0_", stringify!($SelfT), ".isolate_lowest_one(), 0);")]
         /// ```
-        #[unstable(feature = "isolate_most_least_significant_one", issue = "136909")]
+        #[stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
+        #[rustc_const_stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
diff --git a/library/core/src/num/nonzero.rs b/library/core/src/num/nonzero.rs
index c270b947d4fd..e2c552e78d6b 100644
--- a/library/core/src/num/nonzero.rs
+++ b/library/core/src/num/nonzero.rs
@@ -650,8 +650,6 @@ pub const fn trailing_zeros(self) -> u32 {
             /// # Example
             ///
             /// ```
-            /// #![feature(isolate_most_least_significant_one)]
-            ///
             /// # use core::num::NonZero;
             /// # fn main() { test().unwrap(); }
             /// # fn test() -> Option<()> {
@@ -662,7 +660,8 @@ pub const fn trailing_zeros(self) -> u32 {
             /// # Some(())
             /// # }
             /// ```
-            #[unstable(feature = "isolate_most_least_significant_one", issue = "136909")]
+            #[stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
+            #[rustc_const_stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                         without modifying the original"]
             #[inline(always)]
@@ -683,8 +682,6 @@ pub const fn isolate_highest_one(self) -> Self {
             /// # Example
             ///
             /// ```
-            /// #![feature(isolate_most_least_significant_one)]
-            ///
             /// # use core::num::NonZero;
             /// # fn main() { test().unwrap(); }
             /// # fn test() -> Option<()> {
@@ -695,7 +692,8 @@ pub const fn isolate_highest_one(self) -> Self {
             /// # Some(())
             /// # }
             /// ```
-            #[unstable(feature = "isolate_most_least_significant_one", issue = "136909")]
+            #[stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
+            #[rustc_const_stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                         without modifying the original"]
             #[inline(always)]
diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs
index c35deee920e4..fd43ca742aef 100644
--- a/library/core/src/num/uint_macros.rs
+++ b/library/core/src/num/uint_macros.rs
@@ -253,14 +253,13 @@ pub const fn bit_width(self) -> u32 {
         /// # Examples
         ///
         /// ```
-        /// #![feature(isolate_most_least_significant_one)]
-        ///
         #[doc = concat!("let n: ", stringify!($SelfT), " = 0b_01100100;")]
         ///
         /// assert_eq!(n.isolate_highest_one(), 0b_01000000);
         #[doc = concat!("assert_eq!(0_", stringify!($SelfT), ".isolate_highest_one(), 0);")]
         /// ```
-        #[unstable(feature = "isolate_most_least_significant_one", issue = "136909")]
+        #[stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
+        #[rustc_const_stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
@@ -274,14 +273,13 @@ pub const fn isolate_highest_one(self) -> Self {
         /// # Examples
         ///
         /// ```
-        /// #![feature(isolate_most_least_significant_one)]
-        ///
         #[doc = concat!("let n: ", stringify!($SelfT), " = 0b_01100100;")]
         ///
         /// assert_eq!(n.isolate_lowest_one(), 0b_00000100);
         #[doc = concat!("assert_eq!(0_", stringify!($SelfT), ".isolate_lowest_one(), 0);")]
         /// ```
-        #[unstable(feature = "isolate_most_least_significant_one", issue = "136909")]
+        #[stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
+        #[rustc_const_stable(feature = "isolate_most_least_significant_one", since = "CURRENT_RUSTC_VERSION")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
diff --git a/library/coretests/tests/lib.rs b/library/coretests/tests/lib.rs
index 129d2c013cd2..c709b6c432e5 100644
--- a/library/coretests/tests/lib.rs
+++ b/library/coretests/tests/lib.rs
@@ -70,7 +70,6 @@
 #![feature(int_roundings)]
 #![feature(ip)]
 #![feature(is_ascii_octdigit)]
-#![feature(isolate_most_least_significant_one)]
 #![feature(iter_advance_by)]
 #![feature(iter_array_chunks)]
 #![feature(iter_collect_into)]