diff --git a/library/core/src/result.rs b/library/core/src/result.rs
index 504a01813ac84..575fd2b42d213 100644
--- a/library/core/src/result.rs
+++ b/library/core/src/result.rs
@@ -1504,14 +1504,14 @@ impl<T, E> Result<&T, E> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(result_copied)]
     /// let val = 12;
     /// let x: Result<&i32, i32> = Ok(&val);
     /// assert_eq!(x, Ok(&12));
     /// let copied = x.copied();
     /// assert_eq!(copied, Ok(12));
     /// ```
-    #[unstable(feature = "result_copied", reason = "newly added", issue = "63168")]
+    #[inline]
+    #[stable(feature = "result_copied", since = "1.59.0")]
     pub fn copied(self) -> Result<T, E>
     where
         T: Copy,
@@ -1525,14 +1525,14 @@ impl<T, E> Result<&T, E> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(result_cloned)]
     /// let val = 12;
     /// let x: Result<&i32, i32> = Ok(&val);
     /// assert_eq!(x, Ok(&12));
     /// let cloned = x.cloned();
     /// assert_eq!(cloned, Ok(12));
     /// ```
-    #[unstable(feature = "result_cloned", reason = "newly added", issue = "63168")]
+    #[inline]
+    #[stable(feature = "result_cloned", since = "1.59.0")]
     pub fn cloned(self) -> Result<T, E>
     where
         T: Clone,
@@ -1548,14 +1548,14 @@ impl<T, E> Result<&mut T, E> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(result_copied)]
     /// let mut val = 12;
     /// let x: Result<&mut i32, i32> = Ok(&mut val);
     /// assert_eq!(x, Ok(&mut 12));
     /// let copied = x.copied();
     /// assert_eq!(copied, Ok(12));
     /// ```
-    #[unstable(feature = "result_copied", reason = "newly added", issue = "63168")]
+    #[inline]
+    #[stable(feature = "result_copied", since = "1.59.0")]
     pub fn copied(self) -> Result<T, E>
     where
         T: Copy,
@@ -1569,14 +1569,14 @@ impl<T, E> Result<&mut T, E> {
     /// # Examples
     ///
     /// ```
-    /// #![feature(result_cloned)]
     /// let mut val = 12;
     /// let x: Result<&mut i32, i32> = Ok(&mut val);
     /// assert_eq!(x, Ok(&mut 12));
     /// let cloned = x.cloned();
     /// assert_eq!(cloned, Ok(12));
     /// ```
-    #[unstable(feature = "result_cloned", reason = "newly added", issue = "63168")]
+    #[inline]
+    #[stable(feature = "result_cloned", since = "1.59.0")]
     pub fn cloned(self) -> Result<T, E>
     where
         T: Clone,