Rollup merge of rust-lang#149087 - nxsaken:unchecked_neg_shifts_stabilize, r=Amanieu

Stabilize `unchecked_neg` and `unchecked_shifts`

Features: `unchecked_neg`, `unchecked_shifts`
Tracking issue: rust-lang#85122

r? `@Amanieu`

Author: Zalathar

core/src/lib.rs

@@ -126,8 +126,6 @@
 #![feature(str_split_inclusive_remainder)]
 #![feature(str_split_remainder)]
 #![feature(ub_checks)]
-#![feature(unchecked_neg)]
-#![feature(unchecked_shifts)]
 #![feature(unsafe_pinned)]
 #![feature(utf16_extra)]
 #![feature(variant_count)]

core/src/num/int_macros.rs

@@ -1275,11 +1275,8 @@ macro_rules! int_impl {
         /// i.e. when [`checked_neg`] would return `None`.
         ///
         #[doc = concat!("[`checked_neg`]: ", stringify!($SelfT), "::checked_neg")]
-        #[unstable(
-            feature = "unchecked_neg",
-            reason = "niche optimization path",
-            issue = "85122",
-        )]
+        #[stable(feature = "unchecked_neg", since = "CURRENT_RUSTC_VERSION")]
+        #[rustc_const_stable(feature = "unchecked_neg", since = "CURRENT_RUSTC_VERSION")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
@@ -1395,11 +1392,8 @@ macro_rules! int_impl {
         /// i.e. when [`checked_shl`] would return `None`.
         ///
         #[doc = concat!("[`checked_shl`]: ", stringify!($SelfT), "::checked_shl")]
-        #[unstable(
-            feature = "unchecked_shifts",
-            reason = "niche optimization path",
-            issue = "85122",
-        )]
+        #[stable(feature = "unchecked_shifts", since = "CURRENT_RUSTC_VERSION")]
+        #[rustc_const_stable(feature = "unchecked_shifts", since = "CURRENT_RUSTC_VERSION")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
@@ -1570,11 +1564,8 @@ macro_rules! int_impl {
         /// i.e. when [`checked_shr`] would return `None`.
         ///
         #[doc = concat!("[`checked_shr`]: ", stringify!($SelfT), "::checked_shr")]
-        #[unstable(
-            feature = "unchecked_shifts",
-            reason = "niche optimization path",
-            issue = "85122",
-        )]
+        #[stable(feature = "unchecked_shifts", since = "CURRENT_RUSTC_VERSION")]
+        #[rustc_const_stable(feature = "unchecked_shifts", since = "CURRENT_RUSTC_VERSION")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]

core/src/num/uint_macros.rs

@@ -1851,11 +1851,8 @@ macro_rules! uint_impl {
         /// i.e. when [`checked_shl`] would return `None`.
         ///
         #[doc = concat!("[`checked_shl`]: ", stringify!($SelfT), "::checked_shl")]
-        #[unstable(
-            feature = "unchecked_shifts",
-            reason = "niche optimization path",
-            issue = "85122",
-        )]
+        #[stable(feature = "unchecked_shifts", since = "CURRENT_RUSTC_VERSION")]
+        #[rustc_const_stable(feature = "unchecked_shifts", since = "CURRENT_RUSTC_VERSION")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]
@@ -2023,11 +2020,8 @@ macro_rules! uint_impl {
         /// i.e. when [`checked_shr`] would return `None`.
         ///
         #[doc = concat!("[`checked_shr`]: ", stringify!($SelfT), "::checked_shr")]
-        #[unstable(
-            feature = "unchecked_shifts",
-            reason = "niche optimization path",
-            issue = "85122",
-        )]
+        #[stable(feature = "unchecked_shifts", since = "CURRENT_RUSTC_VERSION")]
+        #[rustc_const_stable(feature = "unchecked_shifts", since = "CURRENT_RUSTC_VERSION")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline(always)]