diff --git a/library/alloc/src/lib.rs b/library/alloc/src/lib.rs
index e43b6ac40391d..f435f503fc160 100644
--- a/library/alloc/src/lib.rs
+++ b/library/alloc/src/lib.rs
@@ -144,7 +144,6 @@
 #![feature(ptr_metadata)]
 #![feature(ptr_sub_ptr)]
 #![feature(receiver_trait)]
-#![feature(saturating_int_impl)]
 #![feature(set_ptr_value)]
 #![feature(sized_type_properties)]
 #![feature(slice_from_ptr_range)]
diff --git a/library/core/src/num/mod.rs b/library/core/src/num/mod.rs
index 95dcaf5dd7397..4232319fecb32 100644
--- a/library/core/src/num/mod.rs
+++ b/library/core/src/num/mod.rs
@@ -44,11 +44,10 @@ mod uint_macros; // import uint_impl!
 mod error;
 mod int_log10;
 mod nonzero;
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
 mod saturating;
 mod wrapping;
 
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
+#[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
 pub use saturating::Saturating;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use wrapping::Wrapping;
diff --git a/library/core/src/num/saturating.rs b/library/core/src/num/saturating.rs
index e9f794e7d6211..5757e7498add5 100644
--- a/library/core/src/num/saturating.rs
+++ b/library/core/src/num/saturating.rs
@@ -4,7 +4,7 @@ use crate::fmt;
 use crate::ops::{Add, AddAssign, BitAnd, BitAndAssign, BitOr, BitOrAssign};
 use crate::ops::{BitXor, BitXorAssign, Div, DivAssign};
 use crate::ops::{Mul, MulAssign, Neg, Not, Rem, RemAssign};
-use crate::ops::{Shl, ShlAssign, Shr, ShrAssign, Sub, SubAssign};
+use crate::ops::{Sub, SubAssign};
 
 /// Provides intentionally-saturating arithmetic on `T`.
 ///
@@ -24,7 +24,6 @@ use crate::ops::{Shl, ShlAssign, Shr, ShrAssign, Sub, SubAssign};
 /// # Examples
 ///
 /// ```
-/// #![feature(saturating_int_impl)]
 /// use std::num::Saturating;
 ///
 /// let max = Saturating(u32::MAX);
@@ -32,181 +31,186 @@ use crate::ops::{Shl, ShlAssign, Shr, ShrAssign, Sub, SubAssign};
 ///
 /// assert_eq!(u32::MAX, (max + one).0);
 /// ```
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
+#[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
 #[derive(PartialEq, Eq, PartialOrd, Ord, Clone, Copy, Default, Hash)]
 #[repr(transparent)]
 #[rustc_diagnostic_item = "Saturating"]
-pub struct Saturating<T>(#[unstable(feature = "saturating_int_impl", issue = "87920")] pub T);
+pub struct Saturating<T>(
+    #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] pub T,
+);
 
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
+#[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
 impl<T: fmt::Debug> fmt::Debug for Saturating<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.0.fmt(f)
     }
 }
 
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
+#[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
 impl<T: fmt::Display> fmt::Display for Saturating<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.0.fmt(f)
     }
 }
 
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
+#[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
 impl<T: fmt::Binary> fmt::Binary for Saturating<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.0.fmt(f)
     }
 }
 
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
+#[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
 impl<T: fmt::Octal> fmt::Octal for Saturating<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.0.fmt(f)
     }
 }
 
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
+#[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
 impl<T: fmt::LowerHex> fmt::LowerHex for Saturating<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.0.fmt(f)
     }
 }
 
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
+#[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
 impl<T: fmt::UpperHex> fmt::UpperHex for Saturating<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         self.0.fmt(f)
     }
 }
-#[allow(unused_macros)]
-macro_rules! sh_impl_signed {
-    ($t:ident, $f:ident) => {
-        // FIXME what is the correct implementation here? see discussion https://github.com/rust-lang/rust/pull/87921#discussion_r695870065
-        //
-        // #[unstable(feature = "saturating_int_impl", issue = "87920")]
-        // impl Shl<$f> for Saturating<$t> {
-        //     type Output = Saturating<$t>;
-        //
-        //     #[inline]
-        //     fn shl(self, other: $f) -> Saturating<$t> {
-        //         if other < 0 {
-        //             Saturating(self.0.shr((-other & self::shift_max::$t as $f) as u32))
-        //         } else {
-        //             Saturating(self.0.shl((other & self::shift_max::$t as $f) as u32))
-        //         }
-        //     }
-        // }
-        // forward_ref_binop! { impl Shl, shl for Saturating<$t>, $f,
-        // #[unstable(feature = "saturating_int_impl", issue = "87920")] }
-        //
-        // #[unstable(feature = "saturating_int_impl", issue = "87920")]
-        // impl ShlAssign<$f> for Saturating<$t> {
-        //     #[inline]
-        //     fn shl_assign(&mut self, other: $f) {
-        //         *self = *self << other;
-        //     }
-        // }
-        // forward_ref_op_assign! { impl ShlAssign, shl_assign for Saturating<$t>, $f }
-
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
-        impl Shr<$f> for Saturating<$t> {
-            type Output = Saturating<$t>;
-
-            #[inline]
-            fn shr(self, other: $f) -> Saturating<$t> {
-                if other < 0 {
-                    Saturating(self.0.shl((-other & self::shift_max::$t as $f) as u32))
-                } else {
-                    Saturating(self.0.shr((other & self::shift_max::$t as $f) as u32))
-                }
-            }
-        }
-        forward_ref_binop! { impl Shr, shr for Saturating<$t>, $f,
-        #[unstable(feature = "saturating_int_impl", issue = "87920")] }
-
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
-        impl ShrAssign<$f> for Saturating<$t> {
-            #[inline]
-            fn shr_assign(&mut self, other: $f) {
-                *self = *self >> other;
-            }
-        }
-        forward_ref_op_assign! { impl ShrAssign, shr_assign for Saturating<$t>, $f }
-    };
-}
-
-macro_rules! sh_impl_unsigned {
-    ($t:ident, $f:ident) => {
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
-        impl Shl<$f> for Saturating<$t> {
-            type Output = Saturating<$t>;
-
-            #[inline]
-            fn shl(self, other: $f) -> Saturating<$t> {
-                Saturating(self.0.wrapping_shl(other as u32))
-            }
-        }
-        forward_ref_binop! { impl Shl, shl for Saturating<$t>, $f,
-        #[unstable(feature = "saturating_int_impl", issue = "87920")] }
-
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
-        impl ShlAssign<$f> for Saturating<$t> {
-            #[inline]
-            fn shl_assign(&mut self, other: $f) {
-                *self = *self << other;
-            }
-        }
-        forward_ref_op_assign! { impl ShlAssign, shl_assign for Saturating<$t>, $f }
-
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
-        impl Shr<$f> for Saturating<$t> {
-            type Output = Saturating<$t>;
-
-            #[inline]
-            fn shr(self, other: $f) -> Saturating<$t> {
-                Saturating(self.0.wrapping_shr(other as u32))
-            }
-        }
-        forward_ref_binop! { impl Shr, shr for Saturating<$t>, $f,
-        #[unstable(feature = "saturating_int_impl", issue = "87920")] }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
-        impl ShrAssign<$f> for Saturating<$t> {
-            #[inline]
-            fn shr_assign(&mut self, other: $f) {
-                *self = *self >> other;
-            }
-        }
-        forward_ref_op_assign! { impl ShrAssign, shr_assign for Saturating<$t>, $f }
-    };
-}
-
-// FIXME (#23545): uncomment the remaining impls
-macro_rules! sh_impl_all {
-    ($($t:ident)*) => ($(
-        //sh_impl_unsigned! { $t, u8 }
-        //sh_impl_unsigned! { $t, u16 }
-        //sh_impl_unsigned! { $t, u32 }
-        //sh_impl_unsigned! { $t, u64 }
-        //sh_impl_unsigned! { $t, u128 }
-        sh_impl_unsigned! { $t, usize }
-
-        //sh_impl_signed! { $t, i8 }
-        //sh_impl_signed! { $t, i16 }
-        //sh_impl_signed! { $t, i32 }
-        //sh_impl_signed! { $t, i64 }
-        //sh_impl_signed! { $t, i128 }
-        //sh_impl_signed! { $t, isize }
-    )*)
-}
-
-sh_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
+// FIXME the correct implementation is not clear. Waiting for a real world use case at https://github.com/rust-lang/libs-team/issues/230
+//
+// #[allow(unused_macros)]
+// macro_rules! sh_impl_signed {
+//     ($t:ident, $f:ident) => {
+//         // FIXME what is the correct implementation here? see discussion https://github.com/rust-lang/rust/pull/87921#discussion_r695870065
+//         //
+//         // #[unstable(feature = "saturating_int_impl", issue = "87920")]
+//         // impl Shl<$f> for Saturating<$t> {
+//         //     type Output = Saturating<$t>;
+//         //
+//         //     #[inline]
+//         //     fn shl(self, other: $f) -> Saturating<$t> {
+//         //         if other < 0 {
+//         //             Saturating(self.0.shr((-other & self::shift_max::$t as $f) as u32))
+//         //         } else {
+//         //             Saturating(self.0.shl((other & self::shift_max::$t as $f) as u32))
+//         //         }
+//         //     }
+//         // }
+//         // forward_ref_binop! { impl Shl, shl for Saturating<$t>, $f,
+//         // #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+//         //
+//         // #[unstable(feature = "saturating_int_impl", issue = "87920")]
+//         // impl ShlAssign<$f> for Saturating<$t> {
+//         //     #[inline]
+//         //     fn shl_assign(&mut self, other: $f) {
+//         //         *self = *self << other;
+//         //     }
+//         // }
+//         // forward_ref_op_assign! { impl ShlAssign, shl_assign for Saturating<$t>, $f }
+//
+//         #[unstable(feature = "saturating_int_impl", issue = "87920")]
+//         impl Shr<$f> for Saturating<$t> {
+//             type Output = Saturating<$t>;
+//
+//             #[inline]
+//             fn shr(self, other: $f) -> Saturating<$t> {
+//                 if other < 0 {
+//                     Saturating(self.0.shl((-other & self::shift_max::$t as $f) as u32))
+//                 } else {
+//                     Saturating(self.0.shr((other & self::shift_max::$t as $f) as u32))
+//                 }
+//             }
+//         }
+//         forward_ref_binop! { impl Shr, shr for Saturating<$t>, $f,
+//         #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+//
+//         #[unstable(feature = "saturating_int_impl", issue = "87920")]
+//         impl ShrAssign<$f> for Saturating<$t> {
+//             #[inline]
+//             fn shr_assign(&mut self, other: $f) {
+//                 *self = *self >> other;
+//             }
+//         }
+//         forward_ref_op_assign! { impl ShrAssign, shr_assign for Saturating<$t>, $f }
+//     };
+// }
+//
+// macro_rules! sh_impl_unsigned {
+//     ($t:ident, $f:ident) => {
+//         #[unstable(feature = "saturating_int_impl", issue = "87920")]
+//         impl Shl<$f> for Saturating<$t> {
+//             type Output = Saturating<$t>;
+//
+//             #[inline]
+//             fn shl(self, other: $f) -> Saturating<$t> {
+//                 Saturating(self.0.wrapping_shl(other as u32))
+//             }
+//         }
+//         forward_ref_binop! { impl Shl, shl for Saturating<$t>, $f,
+//         #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+//
+//         #[unstable(feature = "saturating_int_impl", issue = "87920")]
+//         impl ShlAssign<$f> for Saturating<$t> {
+//             #[inline]
+//             fn shl_assign(&mut self, other: $f) {
+//                 *self = *self << other;
+//             }
+//         }
+//         forward_ref_op_assign! { impl ShlAssign, shl_assign for Saturating<$t>, $f }
+//
+//         #[unstable(feature = "saturating_int_impl", issue = "87920")]
+//         impl Shr<$f> for Saturating<$t> {
+//             type Output = Saturating<$t>;
+//
+//             #[inline]
+//             fn shr(self, other: $f) -> Saturating<$t> {
+//                 Saturating(self.0.wrapping_shr(other as u32))
+//             }
+//         }
+//         forward_ref_binop! { impl Shr, shr for Saturating<$t>, $f,
+//         #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+//
+//         #[unstable(feature = "saturating_int_impl", issue = "87920")]
+//         impl ShrAssign<$f> for Saturating<$t> {
+//             #[inline]
+//             fn shr_assign(&mut self, other: $f) {
+//                 *self = *self >> other;
+//             }
+//         }
+//         forward_ref_op_assign! { impl ShrAssign, shr_assign for Saturating<$t>, $f }
+//     };
+// }
+//
+// // FIXME (#23545): uncomment the remaining impls
+// macro_rules! sh_impl_all {
+//     ($($t:ident)*) => ($(
+//         //sh_impl_unsigned! { $t, u8 }
+//         //sh_impl_unsigned! { $t, u16 }
+//         //sh_impl_unsigned! { $t, u32 }
+//         //sh_impl_unsigned! { $t, u64 }
+//         //sh_impl_unsigned! { $t, u128 }
+//         sh_impl_unsigned! { $t, usize }
+//
+//         //sh_impl_signed! { $t, i8 }
+//         //sh_impl_signed! { $t, i16 }
+//         //sh_impl_signed! { $t, i32 }
+//         //sh_impl_signed! { $t, i64 }
+//         //sh_impl_signed! { $t, i128 }
+//         //sh_impl_signed! { $t, isize }
+//     )*)
+// }
+//
+// sh_impl_all! { u8 u16 u32 u64 u128 usize i8 i16 i32 i64 i128 isize }
 
 // FIXME(30524): impl Op<T> for Saturating<T>, impl OpAssign<T> for Saturating<T>
 macro_rules! saturating_impl {
     ($($t:ty)*) => ($(
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl Add for Saturating<$t> {
             type Output = Saturating<$t>;
 
@@ -216,9 +220,9 @@ macro_rules! saturating_impl {
             }
         }
         forward_ref_binop! { impl Add, add for Saturating<$t>, Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl AddAssign for Saturating<$t> {
             #[inline]
             fn add_assign(&mut self, other: Saturating<$t>) {
@@ -227,7 +231,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl AddAssign, add_assign for Saturating<$t>, Saturating<$t> }
 
-        #[unstable(feature = "saturating_int_assign_impl", issue = "92354")]
+        #[stable(feature = "saturating_int_assign_impl", since = "CURRENT_RUSTC_VERSION")]
         impl AddAssign<$t> for Saturating<$t> {
             #[inline]
             fn add_assign(&mut self, other: $t) {
@@ -236,7 +240,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl AddAssign, add_assign for Saturating<$t>, $t }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl Sub for Saturating<$t> {
             type Output = Saturating<$t>;
 
@@ -246,9 +250,9 @@ macro_rules! saturating_impl {
             }
         }
         forward_ref_binop! { impl Sub, sub for Saturating<$t>, Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl SubAssign for Saturating<$t> {
             #[inline]
             fn sub_assign(&mut self, other: Saturating<$t>) {
@@ -257,7 +261,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl SubAssign, sub_assign for Saturating<$t>, Saturating<$t> }
 
-        #[unstable(feature = "saturating_int_assign_impl", issue = "92354")]
+        #[stable(feature = "saturating_int_assign_impl", since = "CURRENT_RUSTC_VERSION")]
         impl SubAssign<$t> for Saturating<$t> {
             #[inline]
             fn sub_assign(&mut self, other: $t) {
@@ -266,7 +270,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl SubAssign, sub_assign for Saturating<$t>, $t }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl Mul for Saturating<$t> {
             type Output = Saturating<$t>;
 
@@ -276,9 +280,9 @@ macro_rules! saturating_impl {
             }
         }
         forward_ref_binop! { impl Mul, mul for Saturating<$t>, Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl MulAssign for Saturating<$t> {
             #[inline]
             fn mul_assign(&mut self, other: Saturating<$t>) {
@@ -287,7 +291,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl MulAssign, mul_assign for Saturating<$t>, Saturating<$t> }
 
-        #[unstable(feature = "saturating_int_assign_impl", issue = "92354")]
+        #[stable(feature = "saturating_int_assign_impl", since = "CURRENT_RUSTC_VERSION")]
         impl MulAssign<$t> for Saturating<$t> {
             #[inline]
             fn mul_assign(&mut self, other: $t) {
@@ -301,7 +305,6 @@ macro_rules! saturating_impl {
         /// Basic usage:
         ///
         /// ```
-        /// #![feature(saturating_int_impl)]
         /// use std::num::Saturating;
         ///
         #[doc = concat!("assert_eq!(Saturating(2", stringify!($t), "), Saturating(5", stringify!($t), ") / Saturating(2));")]
@@ -310,12 +313,11 @@ macro_rules! saturating_impl {
         /// ```
         ///
         /// ```should_panic
-        /// #![feature(saturating_int_impl)]
         /// use std::num::Saturating;
         ///
         #[doc = concat!("let _ = Saturating(0", stringify!($t), ") / Saturating(0);")]
         /// ```
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl Div for Saturating<$t> {
             type Output = Saturating<$t>;
 
@@ -325,10 +327,10 @@ macro_rules! saturating_impl {
             }
         }
         forward_ref_binop! { impl Div, div for Saturating<$t>, Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
 
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl DivAssign for Saturating<$t> {
             #[inline]
             fn div_assign(&mut self, other: Saturating<$t>) {
@@ -337,7 +339,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl DivAssign, div_assign for Saturating<$t>, Saturating<$t> }
 
-        #[unstable(feature = "saturating_int_assign_impl", issue = "92354")]
+        #[stable(feature = "saturating_int_assign_impl", since = "CURRENT_RUSTC_VERSION")]
         impl DivAssign<$t> for Saturating<$t> {
             #[inline]
             fn div_assign(&mut self, other: $t) {
@@ -346,7 +348,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl DivAssign, div_assign for Saturating<$t>, $t }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl Rem for Saturating<$t> {
             type Output = Saturating<$t>;
 
@@ -356,9 +358,9 @@ macro_rules! saturating_impl {
             }
         }
         forward_ref_binop! { impl Rem, rem for Saturating<$t>, Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl RemAssign for Saturating<$t> {
             #[inline]
             fn rem_assign(&mut self, other: Saturating<$t>) {
@@ -367,7 +369,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl RemAssign, rem_assign for Saturating<$t>, Saturating<$t> }
 
-        #[unstable(feature = "saturating_int_assign_impl", issue = "92354")]
+        #[stable(feature = "saturating_int_assign_impl", since = "CURRENT_RUSTC_VERSION")]
         impl RemAssign<$t> for Saturating<$t> {
             #[inline]
             fn rem_assign(&mut self, other: $t) {
@@ -376,7 +378,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl RemAssign, rem_assign for Saturating<$t>, $t }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl Not for Saturating<$t> {
             type Output = Saturating<$t>;
 
@@ -386,9 +388,9 @@ macro_rules! saturating_impl {
             }
         }
         forward_ref_unop! { impl Not, not for Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl BitXor for Saturating<$t> {
             type Output = Saturating<$t>;
 
@@ -398,9 +400,9 @@ macro_rules! saturating_impl {
             }
         }
         forward_ref_binop! { impl BitXor, bitxor for Saturating<$t>, Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl BitXorAssign for Saturating<$t> {
             #[inline]
             fn bitxor_assign(&mut self, other: Saturating<$t>) {
@@ -409,7 +411,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl BitXorAssign, bitxor_assign for Saturating<$t>, Saturating<$t> }
 
-        #[unstable(feature = "saturating_int_assign_impl", issue = "92354")]
+        #[stable(feature = "saturating_int_assign_impl", since = "CURRENT_RUSTC_VERSION")]
         impl BitXorAssign<$t> for Saturating<$t> {
             #[inline]
             fn bitxor_assign(&mut self, other: $t) {
@@ -418,7 +420,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl BitXorAssign, bitxor_assign for Saturating<$t>, $t }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl BitOr for Saturating<$t> {
             type Output = Saturating<$t>;
 
@@ -428,9 +430,9 @@ macro_rules! saturating_impl {
             }
         }
         forward_ref_binop! { impl BitOr, bitor for Saturating<$t>, Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl BitOrAssign for Saturating<$t> {
             #[inline]
             fn bitor_assign(&mut self, other: Saturating<$t>) {
@@ -439,7 +441,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl BitOrAssign, bitor_assign for Saturating<$t>, Saturating<$t> }
 
-        #[unstable(feature = "saturating_int_assign_impl", issue = "92354")]
+        #[stable(feature = "saturating_int_assign_impl", since = "CURRENT_RUSTC_VERSION")]
         impl BitOrAssign<$t> for Saturating<$t> {
             #[inline]
             fn bitor_assign(&mut self, other: $t) {
@@ -448,7 +450,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl BitOrAssign, bitor_assign for Saturating<$t>, $t }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl BitAnd for Saturating<$t> {
             type Output = Saturating<$t>;
 
@@ -458,9 +460,9 @@ macro_rules! saturating_impl {
             }
         }
         forward_ref_binop! { impl BitAnd, bitand for Saturating<$t>, Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl BitAndAssign for Saturating<$t> {
             #[inline]
             fn bitand_assign(&mut self, other: Saturating<$t>) {
@@ -469,7 +471,7 @@ macro_rules! saturating_impl {
         }
         forward_ref_op_assign! { impl BitAndAssign, bitand_assign for Saturating<$t>, Saturating<$t> }
 
-        #[unstable(feature = "saturating_int_assign_impl", issue = "92354")]
+        #[stable(feature = "saturating_int_assign_impl", since = "CURRENT_RUSTC_VERSION")]
         impl BitAndAssign<$t> for Saturating<$t> {
             #[inline]
             fn bitand_assign(&mut self, other: $t) {
@@ -493,12 +495,11 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert_eq!(<Saturating<", stringify!($t), ">>::MIN, Saturating(", stringify!($t), "::MIN));")]
             /// ```
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const MIN: Self = Self(<$t>::MIN);
 
             /// Returns the largest value that can be represented by this integer type.
@@ -508,12 +509,11 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert_eq!(<Saturating<", stringify!($t), ">>::MAX, Saturating(", stringify!($t), "::MAX));")]
             /// ```
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const MAX: Self = Self(<$t>::MAX);
 
             /// Returns the size of this integer type in bits.
@@ -523,12 +523,11 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert_eq!(<Saturating<", stringify!($t), ">>::BITS, ", stringify!($t), "::BITS);")]
             /// ```
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const BITS: u32 = <$t>::BITS;
 
             /// Returns the number of ones in the binary representation of `self`.
@@ -538,7 +537,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("let n = Saturating(0b01001100", stringify!($t), ");")]
@@ -550,7 +548,8 @@ macro_rules! saturating_int_impl {
             #[doc(alias = "popcnt")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn count_ones(self) -> u32 {
                 self.0.count_ones()
             }
@@ -562,7 +561,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert_eq!(Saturating(!0", stringify!($t), ").count_zeros(), 0);")]
@@ -570,7 +568,8 @@ macro_rules! saturating_int_impl {
             #[inline]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn count_zeros(self) -> u32 {
                 self.0.count_zeros()
             }
@@ -582,7 +581,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("let n = Saturating(0b0101000", stringify!($t), ");")]
@@ -592,7 +590,8 @@ macro_rules! saturating_int_impl {
             #[inline]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn trailing_zeros(self) -> u32 {
                 self.0.trailing_zeros()
             }
@@ -609,7 +608,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             /// let n: Saturating<i64> = Saturating(0x0123456789ABCDEF);
@@ -620,7 +618,8 @@ macro_rules! saturating_int_impl {
             #[inline]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn rotate_left(self, n: u32) -> Self {
                 Saturating(self.0.rotate_left(n))
             }
@@ -637,7 +636,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             /// let n: Saturating<i64> = Saturating(0x0123456789ABCDEF);
@@ -648,7 +646,8 @@ macro_rules! saturating_int_impl {
             #[inline]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn rotate_right(self, n: u32) -> Self {
                 Saturating(self.0.rotate_right(n))
             }
@@ -660,7 +659,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             /// let n: Saturating<i16> = Saturating(0b0000000_01010101);
@@ -674,7 +672,8 @@ macro_rules! saturating_int_impl {
             #[inline]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn swap_bytes(self) -> Self {
                 Saturating(self.0.swap_bytes())
             }
@@ -689,7 +688,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             /// let n = Saturating(0b0000000_01010101i16);
@@ -701,8 +699,8 @@ macro_rules! saturating_int_impl {
             /// assert_eq!(m, Saturating(-22016));
             /// ```
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
-            #[rustc_const_unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
             pub const fn reverse_bits(self) -> Self {
@@ -719,7 +717,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("let n = Saturating(0x1A", stringify!($t), ");")]
@@ -732,7 +729,8 @@ macro_rules! saturating_int_impl {
             /// ```
             #[inline]
             #[must_use]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn from_be(x: Self) -> Self {
                 Saturating(<$t>::from_be(x.0))
             }
@@ -747,7 +745,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("let n = Saturating(0x1A", stringify!($t), ");")]
@@ -760,7 +757,8 @@ macro_rules! saturating_int_impl {
             /// ```
             #[inline]
             #[must_use]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn from_le(x: Self) -> Self {
                 Saturating(<$t>::from_le(x.0))
             }
@@ -775,7 +773,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("let n = Saturating(0x1A", stringify!($t), ");")]
@@ -787,7 +784,8 @@ macro_rules! saturating_int_impl {
             /// }
             /// ```
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
             pub const fn to_be(self) -> Self {
@@ -804,7 +802,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("let n = Saturating(0x1A", stringify!($t), ");")]
@@ -816,7 +813,8 @@ macro_rules! saturating_int_impl {
             /// }
             /// ```
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
             pub const fn to_le(self) -> Self {
@@ -830,7 +828,6 @@ macro_rules! saturating_int_impl {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert_eq!(Saturating(3", stringify!($t), ").pow(4), Saturating(81));")]
@@ -839,17 +836,17 @@ macro_rules! saturating_int_impl {
             /// Results that are too large are saturated:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             /// assert_eq!(Saturating(3i8).pow(5), Saturating(127));
             /// assert_eq!(Saturating(3i8).pow(6), Saturating(127));
             /// ```
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
-            pub fn pow(self, exp: u32) -> Self {
+            pub const fn pow(self, exp: u32) -> Self {
                 Saturating(self.0.saturating_pow(exp))
             }
         }
@@ -868,7 +865,6 @@ macro_rules! saturating_int_impl_signed {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("let n = Saturating(", stringify!($t), "::MAX >> 2);")]
@@ -876,7 +872,8 @@ macro_rules! saturating_int_impl_signed {
             /// assert_eq!(n.leading_zeros(), 3);
             /// ```
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
             pub const fn leading_zeros(self) -> u32 {
@@ -891,7 +888,6 @@ macro_rules! saturating_int_impl_signed {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert_eq!(Saturating(100", stringify!($t), ").abs(), Saturating(100));")]
@@ -901,10 +897,11 @@ macro_rules! saturating_int_impl_signed {
             #[doc = concat!("assert_eq!(Saturating(", stringify!($t), "::MIN).abs(), Saturating(", stringify!($t), "::MAX));")]
             /// ```
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
-            pub fn abs(self) -> Saturating<$t> {
+            pub const fn abs(self) -> Saturating<$t> {
                 Saturating(self.0.saturating_abs())
             }
 
@@ -919,7 +916,6 @@ macro_rules! saturating_int_impl_signed {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert_eq!(Saturating(10", stringify!($t), ").signum(), Saturating(1));")]
@@ -927,10 +923,11 @@ macro_rules! saturating_int_impl_signed {
             #[doc = concat!("assert_eq!(Saturating(-10", stringify!($t), ").signum(), Saturating(-1));")]
             /// ```
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
-            pub fn signum(self) -> Saturating<$t> {
+            pub const fn signum(self) -> Saturating<$t> {
                 Saturating(self.0.signum())
             }
 
@@ -942,7 +939,6 @@ macro_rules! saturating_int_impl_signed {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert!(Saturating(10", stringify!($t), ").is_positive());")]
@@ -950,7 +946,8 @@ macro_rules! saturating_int_impl_signed {
             /// ```
             #[must_use]
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn is_positive(self) -> bool {
                 self.0.is_positive()
             }
@@ -963,7 +960,6 @@ macro_rules! saturating_int_impl_signed {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert!(Saturating(-10", stringify!($t), ").is_negative());")]
@@ -971,13 +967,14 @@ macro_rules! saturating_int_impl_signed {
             /// ```
             #[must_use]
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             pub const fn is_negative(self) -> bool {
                 self.0.is_negative()
             }
         }
 
-        #[unstable(feature = "saturating_int_impl", issue = "87920")]
+        #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
         impl Neg for Saturating<$t> {
             type Output = Self;
             #[inline]
@@ -986,7 +983,7 @@ macro_rules! saturating_int_impl_signed {
             }
         }
         forward_ref_unop! { impl Neg, neg for Saturating<$t>,
-                #[unstable(feature = "saturating_int_impl", issue = "87920")] }
+                #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")] }
     )*)
 }
 
@@ -1002,7 +999,6 @@ macro_rules! saturating_int_impl_unsigned {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("let n = Saturating(", stringify!($t), "::MAX >> 2);")]
@@ -1010,7 +1006,8 @@ macro_rules! saturating_int_impl_unsigned {
             /// assert_eq!(n.leading_zeros(), 2);
             /// ```
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
             #[must_use = "this returns the result of the operation, \
                           without modifying the original"]
             pub const fn leading_zeros(self) -> u32 {
@@ -1024,7 +1021,6 @@ macro_rules! saturating_int_impl_unsigned {
             /// Basic usage:
             ///
             /// ```
-            /// #![feature(saturating_int_impl)]
             /// use std::num::Saturating;
             ///
             #[doc = concat!("assert!(Saturating(16", stringify!($t), ").is_power_of_two());")]
@@ -1032,8 +1028,9 @@ macro_rules! saturating_int_impl_unsigned {
             /// ```
             #[must_use]
             #[inline]
-            #[unstable(feature = "saturating_int_impl", issue = "87920")]
-            pub fn is_power_of_two(self) -> bool {
+            #[rustc_const_stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            #[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
+            pub const fn is_power_of_two(self) -> bool {
                 self.0.is_power_of_two()
             }
 
diff --git a/library/std/src/lib.rs b/library/std/src/lib.rs
index 048e8921d17e3..22ccfc0dbe9c8 100644
--- a/library/std/src/lib.rs
+++ b/library/std/src/lib.rs
@@ -375,7 +375,6 @@
 #![feature(get_many_mut)]
 #![feature(lazy_cell)]
 #![feature(log_syntax)]
-#![feature(saturating_int_impl)]
 #![feature(stdsimd)]
 #![feature(test)]
 #![feature(trace_macros)]
diff --git a/library/std/src/num.rs b/library/std/src/num.rs
index 46064bd283770..9e021b23fec30 100644
--- a/library/std/src/num.rs
+++ b/library/std/src/num.rs
@@ -12,7 +12,7 @@ mod tests;
 #[cfg(test)]
 mod benches;
 
-#[unstable(feature = "saturating_int_impl", issue = "87920")]
+#[stable(feature = "saturating_int_impl", since = "CURRENT_RUSTC_VERSION")]
 pub use core::num::Saturating;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::num::Wrapping;
diff --git a/src/tools/clippy/tests/ui/arithmetic_side_effects.rs b/src/tools/clippy/tests/ui/arithmetic_side_effects.rs
index def30f5903d74..b454c29aef4db 100644
--- a/src/tools/clippy/tests/ui/arithmetic_side_effects.rs
+++ b/src/tools/clippy/tests/ui/arithmetic_side_effects.rs
@@ -10,7 +10,7 @@
     arithmetic_overflow,
     unconditional_panic
 )]
-#![feature(const_mut_refs, inline_const, saturating_int_impl)]
+#![feature(const_mut_refs, inline_const)]
 #![warn(clippy::arithmetic_side_effects)]
 
 extern crate proc_macro_derive;