get rid of a whole bunch of unnecessary rustc_const_unstable attributes

library/core/src/array/iter.rs

@@ -136,7 +136,6 @@ impl<T, const N: usize> IntoIter<T, N> {
     /// assert_eq!(r.collect::<Vec<_>>(), vec![10, 11, 12, 13, 14, 15]);
     /// ```
     #[unstable(feature = "array_into_iter_constructors", issue = "91583")]
-    #[rustc_const_unstable(feature = "const_array_into_iter_constructors", issue = "91583")]
     pub const unsafe fn new_unchecked(
         buffer: [MaybeUninit<T>; N],
         initialized: Range<usize>,
@@ -199,7 +198,6 @@ impl<T, const N: usize> IntoIter<T, N> {
     /// assert_eq!(get_bytes(false).collect::<Vec<_>>(), vec![]);
     /// ```
     #[unstable(feature = "array_into_iter_constructors", issue = "91583")]
-    #[rustc_const_unstable(feature = "const_array_into_iter_constructors", issue = "91583")]
     pub const fn empty() -> Self {
         let buffer = [const { MaybeUninit::uninit() }; N];
         let initialized = 0..0;

library/core/src/char/methods.rs

@@ -1515,7 +1515,6 @@ impl char {
     /// ```
     #[must_use]
     #[unstable(feature = "is_ascii_octdigit", issue = "101288")]
-    #[rustc_const_unstable(feature = "is_ascii_octdigit", issue = "101288")]
     #[inline]
     pub const fn is_ascii_octdigit(&self) -> bool {
         matches!(*self, '0'..='7')

library/core/src/lib.rs

@@ -115,8 +115,6 @@
 #![feature(const_align_offset)]
 #![feature(const_alloc_layout)]
 #![feature(const_arguments_as_str)]
-#![feature(const_array_into_iter_constructors)]
-#![feature(const_bigint_helper_methods)]
 #![feature(const_black_box)]
 #![feature(const_char_encode_utf16)]
 #![feature(const_eval_select)]
@@ -125,7 +123,6 @@
 #![feature(const_hash)]
 #![feature(const_heap)]
 #![feature(const_nonnull_new)]
-#![feature(const_num_midpoint)]
 #![feature(const_option_ext)]
 #![feature(const_pin_2)]
 #![feature(const_pointer_is_aligned)]
@@ -135,7 +132,6 @@
 #![feature(const_size_of_val)]
 #![feature(const_size_of_val_raw)]
 #![feature(const_sockaddr_setters)]
-#![feature(const_strict_overflow_ops)]
 #![feature(const_swap)]
 #![feature(const_try)]
 #![feature(const_type_id)]
@@ -167,7 +163,6 @@
 #![feature(unchecked_neg)]
 #![feature(unchecked_shifts)]
 #![feature(utf16_extra)]
-#![feature(utf16_extra_const)]
 #![feature(variant_count)]
 // tidy-alphabetical-end
 //

library/core/src/mem/maybe_uninit.rs

@@ -338,7 +338,6 @@ impl<T> MaybeUninit<T> {
     /// let data = read(&mut buf);
     /// ```
     #[unstable(feature = "maybe_uninit_uninit_array", issue = "96097")]
-    #[rustc_const_unstable(feature = "const_maybe_uninit_uninit_array", issue = "96097")]
     #[must_use]
     #[inline(always)]
     pub const fn uninit_array<const N: usize>() -> [Self; N] {
@@ -946,7 +945,6 @@ impl<T> MaybeUninit<T> {
     /// assert_eq!(array, [0, 1, 2]);
     /// ```
     #[unstable(feature = "maybe_uninit_array_assume_init", issue = "96097")]
-    #[rustc_const_unstable(feature = "const_maybe_uninit_array_assume_init", issue = "96097")]
     #[inline(always)]
     #[track_caller]
     pub const unsafe fn array_assume_init<const N: usize>(array: [Self; N]) -> [T; N] {
@@ -973,7 +971,6 @@ impl<T> MaybeUninit<T> {
     ///
     /// [`assume_init_ref`]: MaybeUninit::assume_init_ref
     #[unstable(feature = "maybe_uninit_slice", issue = "63569")]
-    #[rustc_const_unstable(feature = "maybe_uninit_slice", issue = "63569")]
     #[inline(always)]
     pub const unsafe fn slice_assume_init_ref(slice: &[Self]) -> &[T] {
         // SAFETY: casting `slice` to a `*const [T]` is safe since the caller guarantees that
@@ -995,7 +992,6 @@ impl<T> MaybeUninit<T> {
     ///
     /// [`assume_init_mut`]: MaybeUninit::assume_init_mut
     #[unstable(feature = "maybe_uninit_slice", issue = "63569")]
-    #[rustc_const_unstable(feature = "maybe_uninit_slice", issue = "63569")]
     #[inline(always)]
     pub const unsafe fn slice_assume_init_mut(slice: &mut [Self]) -> &mut [T] {
         // SAFETY: similar to safety notes for `slice_get_ref`, but we have a
@@ -1005,15 +1001,13 @@ impl<T> MaybeUninit<T> {
 
     /// Gets a pointer to the first element of the array.
     #[unstable(feature = "maybe_uninit_slice", issue = "63569")]
-    #[rustc_const_unstable(feature = "maybe_uninit_slice", issue = "63569")]
     #[inline(always)]
     pub const fn slice_as_ptr(this: &[MaybeUninit<T>]) -> *const T {
         this.as_ptr() as *const T
     }
 
     /// Gets a mutable pointer to the first element of the array.
     #[unstable(feature = "maybe_uninit_slice", issue = "63569")]
-    #[rustc_const_unstable(feature = "maybe_uninit_slice", issue = "63569")]
     #[inline(always)]
     pub const fn slice_as_mut_ptr(this: &mut [MaybeUninit<T>]) -> *mut T {
         this.as_mut_ptr() as *mut T

library/core/src/net/ip_addr.rs

@@ -373,7 +373,6 @@ impl IpAddr {
     /// assert_eq!(IpAddr::V6(Ipv6Addr::new(0x2001, 0x2, 0, 0, 0, 0, 0, 0)).is_benchmarking(), true);
     /// ```
     #[unstable(feature = "ip", issue = "27709")]
-    #[rustc_const_unstable(feature = "const_ipv4", issue = "76205")]
     #[must_use]
     #[inline]
     pub const fn is_benchmarking(&self) -> bool {

library/core/src/num/f32.rs

@@ -748,7 +748,6 @@ impl f32 {
     /// [`MAX`]: Self::MAX
     #[inline]
     #[unstable(feature = "float_next_up_down", issue = "91399")]
-    #[rustc_const_unstable(feature = "float_next_up_down", issue = "91399")]
     pub const fn next_up(self) -> Self {
         // Some targets violate Rust's assumption of IEEE semantics, e.g. by flushing
         // denormals to zero. This is in general unsound and unsupported, but here
@@ -797,7 +796,6 @@ impl f32 {
     /// [`MAX`]: Self::MAX
     #[inline]
     #[unstable(feature = "float_next_up_down", issue = "91399")]
-    #[rustc_const_unstable(feature = "float_next_up_down", issue = "91399")]
     pub const fn next_down(self) -> Self {
         // Some targets violate Rust's assumption of IEEE semantics, e.g. by flushing
         // denormals to zero. This is in general unsound and unsupported, but here

library/core/src/num/f64.rs

@@ -765,7 +765,6 @@ impl f64 {
     /// [`MAX`]: Self::MAX
     #[inline]
     #[unstable(feature = "float_next_up_down", issue = "91399")]
-    #[rustc_const_unstable(feature = "float_next_up_down", issue = "91399")]
     pub const fn next_up(self) -> Self {
         // Some targets violate Rust's assumption of IEEE semantics, e.g. by flushing
         // denormals to zero. This is in general unsound and unsupported, but here
@@ -814,7 +813,6 @@ impl f64 {
     /// [`MAX`]: Self::MAX
     #[inline]
     #[unstable(feature = "float_next_up_down", issue = "91399")]
-    #[rustc_const_unstable(feature = "float_next_up_down", issue = "91399")]
     pub const fn next_down(self) -> Self {
         // Some targets violate Rust's assumption of IEEE semantics, e.g. by flushing
         // denormals to zero. This is in general unsound and unsupported, but here

library/core/src/num/int_macros.rs

@@ -477,7 +477,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = (", stringify!($SelfT), "::MAX - 2).strict_add(3);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -573,7 +572,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = (", stringify!($SelfT), "::MAX - 2).strict_add_unsigned(3);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -629,7 +627,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = (", stringify!($SelfT), "::MIN + 2).strict_sub(3);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -725,7 +722,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = (", stringify!($SelfT), "::MIN + 2).strict_sub_unsigned(3);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -781,7 +777,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = ", stringify!($SelfT), "::MAX.strict_mul(2);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -895,7 +890,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = (1", stringify!($SelfT), ").strict_div(0);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -969,7 +963,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = (1", stringify!($SelfT), ").strict_div_euclid(0);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -1042,7 +1035,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = ", stringify!($SelfT), "::MIN.strict_rem(-1);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -1115,7 +1107,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = ", stringify!($SelfT), "::MIN.strict_rem_euclid(-1);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -1203,7 +1194,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = ", stringify!($SelfT), "::MIN.strict_neg();")]
         ///
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -1266,7 +1256,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = 0x1", stringify!($SelfT), ".strict_shl(129);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -1325,7 +1314,6 @@ macro_rules! int_impl {
         #[doc = concat!("assert_eq!(0x1", stringify!($SelfT), ".unbounded_shl(129), 0);")]
         /// ```
         #[unstable(feature = "unbounded_shifts", issue = "129375")]
-        #[rustc_const_unstable(feature = "const_unbounded_shifts", issue = "129375")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -1391,7 +1379,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = 0x10", stringify!($SelfT), ".strict_shr(128);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -1452,7 +1439,6 @@ macro_rules! int_impl {
         #[doc = concat!("assert_eq!(", stringify!($SelfT), "::MIN.unbounded_shr(129), -1);")]
         /// ```
         #[unstable(feature = "unbounded_shifts", issue = "129375")]
-        #[rustc_const_unstable(feature = "const_unbounded_shifts", issue = "129375")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -1519,7 +1505,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = ", stringify!($SelfT), "::MIN.strict_abs();")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -1594,7 +1579,6 @@ macro_rules! int_impl {
         #[doc = concat!("let _ = ", stringify!($SelfT), "::MAX.strict_pow(2);")]
         /// ```
         #[unstable(feature = "strict_overflow_ops", issue = "118260")]
-        #[rustc_const_unstable(feature = "const_strict_overflow_ops", issue = "118260")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -2368,7 +2352,6 @@ macro_rules! int_impl {
         /// assert_eq!((sum1, sum0), (6, 8));
         /// ```
         #[unstable(feature = "bigint_helper_methods", issue = "85532")]
-        #[rustc_const_unstable(feature = "const_bigint_helper_methods", issue = "85532")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -2476,7 +2459,6 @@ macro_rules! int_impl {
         #[doc = concat!("assert_eq!((diff1, diff0), (10, ", stringify!($UnsignedT), "::MAX));")]
         /// ```
         #[unstable(feature = "bigint_helper_methods", issue = "85532")]
-        #[rustc_const_unstable(feature = "const_bigint_helper_methods", issue = "85532")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]

library/core/src/num/mod.rs

@@ -114,7 +114,6 @@ macro_rules! midpoint_impl {
         #[doc = concat!("assert_eq!(1", stringify!($SelfT), ".midpoint(4), 2);")]
         /// ```
         #[unstable(feature = "num_midpoint", issue = "110840")]
-        #[rustc_const_unstable(feature = "const_num_midpoint", issue = "110840")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -142,7 +141,6 @@ macro_rules! midpoint_impl {
         #[doc = concat!("assert_eq!(0", stringify!($SelfT), ".midpoint(7), 3);")]
         /// ```
         #[unstable(feature = "num_midpoint", issue = "110840")]
-        #[rustc_const_unstable(feature = "const_num_midpoint", issue = "110840")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -170,7 +168,6 @@ macro_rules! midpoint_impl {
         #[doc = concat!("assert_eq!(1", stringify!($SelfT), ".midpoint(4), 2);")]
         /// ```
         #[unstable(feature = "num_midpoint", issue = "110840")]
-        #[rustc_const_unstable(feature = "const_num_midpoint", issue = "110840")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -196,7 +193,6 @@ macro_rules! midpoint_impl {
         #[doc = concat!("assert_eq!(0", stringify!($SelfT), ".midpoint(7), 3);")]
         /// ```
         #[unstable(feature = "num_midpoint", issue = "110840")]
-        #[rustc_const_unstable(feature = "const_num_midpoint", issue = "110840")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -229,7 +225,6 @@ macro_rules! widening_impl {
         /// assert_eq!(1_000_000_000u32.widening_mul(10), (1410065408, 2));
         /// ```
         #[unstable(feature = "bigint_helper_methods", issue = "85532")]
-        #[rustc_const_unstable(feature = "const_bigint_helper_methods", issue = "85532")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -320,7 +315,6 @@ macro_rules! widening_impl {
         /// );
         /// ```
         #[unstable(feature = "bigint_helper_methods", issue = "85532")]
-        #[rustc_const_unstable(feature = "bigint_helper_methods", issue = "85532")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]
@@ -915,7 +909,6 @@ impl u8 {
     /// ```
     #[must_use]
     #[unstable(feature = "is_ascii_octdigit", issue = "101288")]
-    #[rustc_const_unstable(feature = "is_ascii_octdigit", issue = "101288")]
     #[inline]
     pub const fn is_ascii_octdigit(&self) -> bool {
         matches!(*self, b'0'..=b'7')
@@ -1195,7 +1188,6 @@ impl u16 {
     /// ```
     #[must_use]
     #[unstable(feature = "utf16_extra", issue = "94919")]
-    #[rustc_const_unstable(feature = "utf16_extra_const", issue = "94919")]
     #[inline]
     pub const fn is_utf16_surrogate(self) -> bool {
         matches!(self, 0xD800..=0xDFFF)

library/core/src/num/nonzero.rs

@@ -1474,7 +1474,6 @@ macro_rules! nonzero_integer_signedness_dependent_methods {
         /// # }
         /// ```
         #[unstable(feature = "num_midpoint", issue = "110840")]
-        #[rustc_const_unstable(feature = "const_num_midpoint", issue = "110840")]
         #[must_use = "this returns the result of the operation, \
                       without modifying the original"]
         #[inline]