Commit 89eed1ab authored by Miguel Ojeda's avatar Miguel Ojeda
Browse files

rust: upgrade to Rust 1.71.1 

This is the second upgrade to the Rust toolchain, from 1.68.2 to 1.71.1
(i.e. the latest).

See the upgrade policy [1] and the comments on the first upgrade in
commit 3ed03f4d ("rust: upgrade to Rust 1.68.2").

# Unstable features

No unstable features (that we use) were stabilized.

Therefore, the only unstable feature allowed to be used outside
the `kernel` crate is still `new_uninit`, though other code to be
upstreamed may increase the list.

Please see [2] for details.

# Required changes

For the upgrade, this patch requires the following changes:

  - Removal of the `__rust_*` allocator functions, together with
    the addition of the `__rust_no_alloc_shim_is_unstable` static.
    See [3] for details.

  - Some more compiler builtins added due to `<f{32,64}>::midpoint()`
    that got added in Rust 1.71 [4].

# `alloc` upgrade and reviewing

The vast majority of changes are due to our `alloc` fork being upgraded
at once.

There are two kinds of changes to be aware of: the ones coming from
upstream, which we should follow as closely as possible, and the updates
needed in our added fallible APIs to keep them matching the newer
infallible APIs coming from upstream.

Instead of taking a look at the diff of this patch, an alternative
approach is reviewing a diff of the changes between upstream `alloc` and
the kernel's. This allows to easily inspect the kernel additions only,
especially to check if the fallible methods we already have still match
the infallible ones in the new version coming from upstream.

Another approach is reviewing the changes introduced in the additions in
the kernel fork between the two versions. This is useful to spot
potentially unintended changes to our additions.

To apply these approaches, one may follow steps similar to the following
to generate a pair of patches that show the differences between upstream
Rust and the kernel (for the subset of `alloc` we use) before and after
applying this patch:

    # Get the difference with respect to the old version.
    git -C rust checkout $(linux/scripts/min-tool-version.sh rustc)
    git -C linux ls-tree -r --name-only HEAD -- rust/alloc |
        cut -d/ -f3- |
        grep -Fv README.md |
        xargs -IPATH cp rust/library/alloc/src/PATH linux/rust/alloc/PATH
    git -C linux diff --patch-with-stat --summary -R > old.patch
    git -C linux restore rust/alloc

    # Apply this patch.
    git -C linux am rust-upgrade.patch

    # Get the difference with respect to the new version.
    git -C rust checkout $(linux/scripts/min-tool-version.sh rustc)
    git -C linux ls-tree -r --name-only HEAD -- rust/alloc |
        cut -d/ -f3- |
        grep -Fv README.md |
        xargs -IPATH cp rust/library/alloc/src/PATH linux/rust/alloc/PATH
    git -C linux diff --patch-with-stat --summary -R > new.patch
    git -C linux restore rust/alloc

Now one may check the `new.patch` to take a look at the additions (first
approach) or at the difference between those two patches (second
approach). For the latter, a side-by-side tool is recommended.

Link: https://rust-for-linux.com/rust-version-policy [1]
Link: https://github.com/Rust-for-Linux/linux/issues/2 [2]
Link: https://github.com/rust-lang/rust/pull/86844 [3]
Link: https://github.com/rust-lang/rust/pull/92048 [4]
Closes: https://github.com/Rust-for-Linux/linux/issues/68


Reviewed-by: default avatarMartin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: default avatarTrevor Gross <tmgross@umich.edu>
Link: https://lore.kernel.org/r/20230729220317.416771-1-ojeda@kernel.org


Signed-off-by: default avatarMiguel Ojeda <ojeda@kernel.org>
parent 41bdc6de

Documentation/process/changes.rst

+1 −1
Original line number Diff line number Diff line
@@ -31,7 +31,7 @@ you probably needn't concern yourself with pcmciautils. 
====================== ===============  ========================================

GNU C                  5.1              gcc --version

Clang/LLVM (optional)  11.0.0           clang --version

Rust (optional)        1.68.2           rustc --version

Rust (optional)        1.71.1           rustc --version

bindgen (optional)     0.56.0           bindgen --version

GNU make               3.82             make --version

bash                   4.2              bash --version

rust/Makefile

+2 −2
Original line number Diff line number Diff line
@@ -379,8 +379,8 @@ rust-analyzer: 
		$(if $(KBUILD_EXTMOD),$(extmod_prefix),$(objtree))/rust-project.json



redirect-intrinsics = \

	__eqsf2 __gesf2 __lesf2 __nesf2 __unordsf2 \

	__unorddf2 \

	__addsf3 __eqsf2 __gesf2 __lesf2 __ltsf2 __mulsf3 __nesf2 __unordsf2 \

	__adddf3 __ledf2 __ltdf2 __muldf3 __unorddf2 \

	__muloti4 __multi3 \

	__udivmodti4 __udivti3 __umodti3

rust/alloc/alloc.rs

+12 −8
Original line number Diff line number Diff line
@@ -16,8 +16,6 @@ use core::ptr::{self, NonNull}; 
#[doc(inline)]

pub use core::alloc::*;



use core::marker::Destruct;



#[cfg(test)]

mod tests;
@@ -41,6 +39,9 @@ extern "Rust" { 
    #[rustc_allocator_zeroed]

    #[rustc_nounwind]

    fn __rust_alloc_zeroed(size: usize, align: usize) -> *mut u8;



    #[cfg(not(bootstrap))]

    static __rust_no_alloc_shim_is_unstable: u8;

}



/// The global memory allocator.
@@ -94,7 +95,14 @@ pub use std::alloc::Global; 
#[must_use = "losing the pointer will leak memory"]

#[inline]

pub unsafe fn alloc(layout: Layout) -> *mut u8 {

    unsafe { __rust_alloc(layout.size(), layout.align()) }

    unsafe {

        // Make sure we don't accidentally allow omitting the allocator shim in

        // stable code until it is actually stabilized.

        #[cfg(not(bootstrap))]

        core::ptr::read_volatile(&__rust_no_alloc_shim_is_unstable);



        __rust_alloc(layout.size(), layout.align())

    }

}



/// Deallocate memory with the global allocator.
@@ -333,16 +341,12 @@ unsafe fn exchange_malloc(size: usize, align: usize) -> *mut u8 { 


#[cfg_attr(not(test), lang = "box_free")]

#[inline]

#[rustc_const_unstable(feature = "const_box", issue = "92521")]

// This signature has to be the same as `Box`, otherwise an ICE will happen.

// When an additional parameter to `Box` is added (like `A: Allocator`), this has to be added here as

// well.

// For example if `Box` is changed to  `struct Box<T: ?Sized, A: Allocator>(Unique<T>, A)`,

// this function has to be changed to `fn box_free<T: ?Sized, A: Allocator>(Unique<T>, A)` as well.

pub(crate) const unsafe fn box_free<T: ?Sized, A: ~const Allocator + ~const Destruct>(

    ptr: Unique<T>,

    alloc: A,

) {

pub(crate) unsafe fn box_free<T: ?Sized, A: Allocator>(ptr: Unique<T>, alloc: A) {

    unsafe {

        let size = size_of_val(ptr.as_ref());

        let align = min_align_of_val(ptr.as_ref());

rust/alloc/boxed.rs

+64 −67
Original line number Diff line number Diff line
@@ -152,16 +152,13 @@ use core::any::Any; 
use core::async_iter::AsyncIterator;

use core::borrow;

use core::cmp::Ordering;

use core::convert::{From, TryFrom};

use core::error::Error;

use core::fmt;

use core::future::Future;

use core::hash::{Hash, Hasher};

#[cfg(not(no_global_oom_handling))]

use core::iter::FromIterator;

use core::iter::{FusedIterator, Iterator};

use core::iter::FusedIterator;

use core::marker::Tuple;

use core::marker::{Destruct, Unpin, Unsize};

use core::marker::Unsize;

use core::mem;

use core::ops::{

    CoerceUnsized, Deref, DerefMut, DispatchFromDyn, Generator, GeneratorState, Receiver,
@@ -218,6 +215,7 @@ impl<T> Box<T> { 
    #[inline(always)]

    #[stable(feature = "rust1", since = "1.0.0")]

    #[must_use]

    #[rustc_diagnostic_item = "box_new"]

    pub fn new(x: T) -> Self {

        #[rustc_box]

        Box::new(x)
@@ -287,9 +285,7 @@ impl<T> Box<T> { 
    #[must_use]

    #[inline(always)]

    pub fn pin(x: T) -> Pin<Box<T>> {

        (#[rustc_box]

        Box::new(x))

        .into()

        Box::new(x).into()

    }



    /// Allocates memory on the heap then places `x` into it,
@@ -381,12 +377,11 @@ impl<T, A: Allocator> Box<T, A> { 
    /// ```

    #[cfg(not(no_global_oom_handling))]

    #[unstable(feature = "allocator_api", issue = "32838")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[must_use]

    #[inline]

    pub const fn new_in(x: T, alloc: A) -> Self

    pub fn new_in(x: T, alloc: A) -> Self

    where

        A: ~const Allocator + ~const Destruct,

        A: Allocator,

    {

        let mut boxed = Self::new_uninit_in(alloc);

        unsafe {
@@ -411,12 +406,10 @@ impl<T, A: Allocator> Box<T, A> { 
    /// # Ok::<(), std::alloc::AllocError>(())

    /// ```

    #[unstable(feature = "allocator_api", issue = "32838")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[inline]

    pub const fn try_new_in(x: T, alloc: A) -> Result<Self, AllocError>

    pub fn try_new_in(x: T, alloc: A) -> Result<Self, AllocError>

    where

        T: ~const Destruct,

        A: ~const Allocator + ~const Destruct,

        A: Allocator,

    {

        let mut boxed = Self::try_new_uninit_in(alloc)?;

        unsafe {
@@ -446,13 +439,12 @@ impl<T, A: Allocator> Box<T, A> { 
    /// assert_eq!(*five, 5)

    /// ```

    #[unstable(feature = "allocator_api", issue = "32838")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[cfg(not(no_global_oom_handling))]

    #[must_use]

    // #[unstable(feature = "new_uninit", issue = "63291")]

    pub const fn new_uninit_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>

    pub fn new_uninit_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>

    where

        A: ~const Allocator + ~const Destruct,

        A: Allocator,

    {

        let layout = Layout::new::<mem::MaybeUninit<T>>();

        // NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable.
@@ -487,10 +479,9 @@ impl<T, A: Allocator> Box<T, A> { 
    /// ```

    #[unstable(feature = "allocator_api", issue = "32838")]

    // #[unstable(feature = "new_uninit", issue = "63291")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    pub const fn try_new_uninit_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>

    pub fn try_new_uninit_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>

    where

        A: ~const Allocator + ~const Destruct,

        A: Allocator,

    {

        let layout = Layout::new::<mem::MaybeUninit<T>>();

        let ptr = alloc.allocate(layout)?.cast();
@@ -518,13 +509,12 @@ impl<T, A: Allocator> Box<T, A> { 
    ///

    /// [zeroed]: mem::MaybeUninit::zeroed

    #[unstable(feature = "allocator_api", issue = "32838")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[cfg(not(no_global_oom_handling))]

    // #[unstable(feature = "new_uninit", issue = "63291")]

    #[must_use]

    pub const fn new_zeroed_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>

    pub fn new_zeroed_in(alloc: A) -> Box<mem::MaybeUninit<T>, A>

    where

        A: ~const Allocator + ~const Destruct,

        A: Allocator,

    {

        let layout = Layout::new::<mem::MaybeUninit<T>>();

        // NOTE: Prefer match over unwrap_or_else since closure sometimes not inlineable.
@@ -559,10 +549,9 @@ impl<T, A: Allocator> Box<T, A> { 
    /// [zeroed]: mem::MaybeUninit::zeroed

    #[unstable(feature = "allocator_api", issue = "32838")]

    // #[unstable(feature = "new_uninit", issue = "63291")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    pub const fn try_new_zeroed_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>

    pub fn try_new_zeroed_in(alloc: A) -> Result<Box<mem::MaybeUninit<T>, A>, AllocError>

    where

        A: ~const Allocator + ~const Destruct,

        A: Allocator,

    {

        let layout = Layout::new::<mem::MaybeUninit<T>>();

        let ptr = alloc.allocate_zeroed(layout)?.cast();
@@ -578,12 +567,11 @@ impl<T, A: Allocator> Box<T, A> { 
    /// construct a (pinned) `Box` in a different way than with [`Box::new_in`].

    #[cfg(not(no_global_oom_handling))]

    #[unstable(feature = "allocator_api", issue = "32838")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[must_use]

    #[inline(always)]

    pub const fn pin_in(x: T, alloc: A) -> Pin<Self>

    pub fn pin_in(x: T, alloc: A) -> Pin<Self>

    where

        A: 'static + ~const Allocator + ~const Destruct,

        A: 'static + Allocator,

    {

        Self::into_pin(Self::new_in(x, alloc))

    }
@@ -592,8 +580,7 @@ impl<T, A: Allocator> Box<T, A> { 
    ///

    /// This conversion does not allocate on the heap and happens in place.

    #[unstable(feature = "box_into_boxed_slice", issue = "71582")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    pub const fn into_boxed_slice(boxed: Self) -> Box<[T], A> {

    pub fn into_boxed_slice(boxed: Self) -> Box<[T], A> {

        let (raw, alloc) = Box::into_raw_with_allocator(boxed);

        unsafe { Box::from_raw_in(raw as *mut [T; 1], alloc) }

    }
@@ -610,12 +597,8 @@ impl<T, A: Allocator> Box<T, A> { 
    /// assert_eq!(Box::into_inner(c), 5);

    /// ```

    #[unstable(feature = "box_into_inner", issue = "80437")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[inline]

    pub const fn into_inner(boxed: Self) -> T

    where

        Self: ~const Destruct,

    {

    pub fn into_inner(boxed: Self) -> T {

        *boxed

    }

}
@@ -829,9 +812,8 @@ impl<T, A: Allocator> Box<mem::MaybeUninit<T>, A> { 
    /// assert_eq!(*five, 5)

    /// ```

    #[unstable(feature = "new_uninit", issue = "63291")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[inline]

    pub const unsafe fn assume_init(self) -> Box<T, A> {

    pub unsafe fn assume_init(self) -> Box<T, A> {

        let (raw, alloc) = Box::into_raw_with_allocator(self);

        unsafe { Box::from_raw_in(raw as *mut T, alloc) }

    }
@@ -864,9 +846,8 @@ impl<T, A: Allocator> Box<mem::MaybeUninit<T>, A> { 
    /// }

    /// ```

    #[unstable(feature = "new_uninit", issue = "63291")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[inline]

    pub const fn write(mut boxed: Self, value: T) -> Box<T, A> {

    pub fn write(mut boxed: Self, value: T) -> Box<T, A> {

        unsafe {

            (*boxed).write(value);

            boxed.assume_init()
@@ -1110,9 +1091,8 @@ impl<T: ?Sized, A: Allocator> Box<T, A> { 
    ///

    /// [memory layout]: self#memory-layout

    #[unstable(feature = "allocator_api", issue = "32838")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[inline]

    pub const fn into_raw_with_allocator(b: Self) -> (*mut T, A) {

    pub fn into_raw_with_allocator(b: Self) -> (*mut T, A) {

        let (leaked, alloc) = Box::into_unique(b);

        (leaked.as_ptr(), alloc)

    }
@@ -1122,10 +1102,9 @@ impl<T: ?Sized, A: Allocator> Box<T, A> { 
        issue = "none",

        reason = "use `Box::leak(b).into()` or `Unique::from(Box::leak(b))` instead"

    )]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[inline]

    #[doc(hidden)]

    pub const fn into_unique(b: Self) -> (Unique<T>, A) {

    pub fn into_unique(b: Self) -> (Unique<T>, A) {

        // Box is recognized as a "unique pointer" by Stacked Borrows, but internally it is a

        // raw pointer for the type system. Turning it directly into a raw pointer would not be

        // recognized as "releasing" the unique pointer to permit aliased raw accesses,
@@ -1183,9 +1162,8 @@ impl<T: ?Sized, A: Allocator> Box<T, A> { 
    /// assert_eq!(*static_ref, [4, 2, 3]);

    /// ```

    #[stable(feature = "box_leak", since = "1.26.0")]

    #[rustc_const_unstable(feature = "const_box", issue = "92521")]

    #[inline]

    pub const fn leak<'a>(b: Self) -> &'a mut T

    pub fn leak<'a>(b: Self) -> &'a mut T

    where

        A: 'a,

    {
@@ -1246,16 +1224,16 @@ unsafe impl<#[may_dangle] T: ?Sized, A: Allocator> Drop for Box<T, A> { 
#[stable(feature = "rust1", since = "1.0.0")]

impl<T: Default> Default for Box<T> {

    /// Creates a `Box<T>`, with the `Default` value for T.

    #[inline]

    fn default() -> Self {

        #[rustc_box]

        Box::new(T::default())

    }

}



#[cfg(not(no_global_oom_handling))]

#[stable(feature = "rust1", since = "1.0.0")]

#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]

impl<T> const Default for Box<[T]> {

impl<T> Default for Box<[T]> {

    #[inline]

    fn default() -> Self {

        let ptr: Unique<[T]> = Unique::<[T; 0]>::dangling();

        Box(ptr, Global)
@@ -1264,8 +1242,8 @@ impl<T> const Default for Box<[T]> { 


#[cfg(not(no_global_oom_handling))]

#[stable(feature = "default_box_extra", since = "1.17.0")]

#[rustc_const_unstable(feature = "const_default_impls", issue = "87864")]

impl const Default for Box<str> {

impl Default for Box<str> {

    #[inline]

    fn default() -> Self {

        // SAFETY: This is the same as `Unique::cast<U>` but with an unsized `U = str`.

        let ptr: Unique<str> = unsafe {
@@ -1461,8 +1439,7 @@ impl<T> From<T> for Box<T> { 
}



#[stable(feature = "pin", since = "1.33.0")]

#[rustc_const_unstable(feature = "const_box", issue = "92521")]

impl<T: ?Sized, A: Allocator> const From<Box<T, A>> for Pin<Box<T, A>>

impl<T: ?Sized, A: Allocator> From<Box<T, A>> for Pin<Box<T, A>>

where

    A: 'static,

{
@@ -1482,9 +1459,36 @@ where 
    }

}



/// Specialization trait used for `From<&[T]>`.

#[cfg(not(no_global_oom_handling))]

trait BoxFromSlice<T> {

    fn from_slice(slice: &[T]) -> Self;

}



#[cfg(not(no_global_oom_handling))]

impl<T: Clone> BoxFromSlice<T> for Box<[T]> {

    #[inline]

    default fn from_slice(slice: &[T]) -> Self {

        slice.to_vec().into_boxed_slice()

    }

}



#[cfg(not(no_global_oom_handling))]

impl<T: Copy> BoxFromSlice<T> for Box<[T]> {

    #[inline]

    fn from_slice(slice: &[T]) -> Self {

        let len = slice.len();

        let buf = RawVec::with_capacity(len);

        unsafe {

            ptr::copy_nonoverlapping(slice.as_ptr(), buf.ptr(), len);

            buf.into_box(slice.len()).assume_init()

        }

    }

}



#[cfg(not(no_global_oom_handling))]

#[stable(feature = "box_from_slice", since = "1.17.0")]

impl<T: Copy> From<&[T]> for Box<[T]> {

impl<T: Clone> From<&[T]> for Box<[T]> {

    /// Converts a `&[T]` into a `Box<[T]>`

    ///

    /// This conversion allocates on the heap
@@ -1498,19 +1502,15 @@ impl<T: Copy> From<&[T]> for Box<[T]> { 
    ///

    /// println!("{boxed_slice:?}");

    /// ```

    #[inline]

    fn from(slice: &[T]) -> Box<[T]> {

        let len = slice.len();

        let buf = RawVec::with_capacity(len);

        unsafe {

            ptr::copy_nonoverlapping(slice.as_ptr(), buf.ptr(), len);

            buf.into_box(slice.len()).assume_init()

        }

        <Self as BoxFromSlice<T>>::from_slice(slice)

    }

}



#[cfg(not(no_global_oom_handling))]

#[stable(feature = "box_from_cow", since = "1.45.0")]

impl<T: Copy> From<Cow<'_, [T]>> for Box<[T]> {

impl<T: Clone> From<Cow<'_, [T]>> for Box<[T]> {

    /// Converts a `Cow<'_, [T]>` into a `Box<[T]>`

    ///

    /// When `cow` is the `Cow::Borrowed` variant, this
@@ -1620,7 +1620,6 @@ impl<T, const N: usize> From<[T; N]> for Box<[T]> { 
    /// println!("{boxed:?}");

    /// ```

    fn from(array: [T; N]) -> Box<[T]> {

        #[rustc_box]

        Box::new(array)

    }

}
@@ -1899,8 +1898,7 @@ impl<T: ?Sized, A: Allocator> fmt::Pointer for Box<T, A> { 
}



#[stable(feature = "rust1", since = "1.0.0")]

#[rustc_const_unstable(feature = "const_box", issue = "92521")]

impl<T: ?Sized, A: Allocator> const Deref for Box<T, A> {

impl<T: ?Sized, A: Allocator> Deref for Box<T, A> {

    type Target = T;



    fn deref(&self) -> &T {
@@ -1909,8 +1907,7 @@ impl<T: ?Sized, A: Allocator> const Deref for Box<T, A> { 
}



#[stable(feature = "rust1", since = "1.0.0")]

#[rustc_const_unstable(feature = "const_box", issue = "92521")]

impl<T: ?Sized, A: Allocator> const DerefMut for Box<T, A> {

impl<T: ?Sized, A: Allocator> DerefMut for Box<T, A> {

    fn deref_mut(&mut self) -> &mut T {

        &mut **self

    }

rust/alloc/lib.rs

+25 −23
Original line number Diff line number Diff line
@@ -89,35 +89,37 @@ 
#![warn(missing_debug_implementations)]

#![warn(missing_docs)]

#![allow(explicit_outlives_requirements)]

#![warn(multiple_supertrait_upcastable)]

//

// Library features:

// tidy-alphabetical-start

#![cfg_attr(not(no_global_oom_handling), feature(const_alloc_error))]

#![cfg_attr(not(no_global_oom_handling), feature(const_btree_len))]

#![cfg_attr(test, feature(is_sorted))]

#![cfg_attr(test, feature(new_uninit))]

#![feature(alloc_layout_extra)]

#![feature(allocator_api)]

#![feature(array_chunks)]

#![feature(array_into_iter_constructors)]

#![feature(array_methods)]

#![feature(array_windows)]

#![feature(ascii_char)]

#![feature(assert_matches)]

#![feature(async_iterator)]

#![feature(coerce_unsized)]

#![cfg_attr(not(no_global_oom_handling), feature(const_alloc_error))]

#![feature(const_align_of_val)]

#![feature(const_box)]

#![cfg_attr(not(no_global_oom_handling), feature(const_btree_len))]

#![cfg_attr(not(no_borrow), feature(const_cow_is_borrowed))]

#![feature(const_convert)]

#![feature(const_size_of_val)]

#![feature(const_align_of_val)]

#![feature(const_ptr_read)]

#![feature(const_maybe_uninit_zeroed)]

#![feature(const_maybe_uninit_write)]

#![feature(const_eval_select)]

#![feature(const_maybe_uninit_as_mut_ptr)]

#![feature(const_maybe_uninit_write)]

#![feature(const_maybe_uninit_zeroed)]

#![feature(const_pin)]

#![feature(const_refs_to_cell)]

#![feature(const_size_of_val)]

#![feature(const_waker)]

#![feature(core_intrinsics)]

#![feature(core_panic)]

#![feature(const_eval_select)]

#![feature(const_pin)]

#![feature(const_waker)]

#![feature(cstr_from_bytes_until_nul)]

#![feature(dispatch_from_dyn)]

#![feature(error_generic_member_access)]

#![feature(error_in_core)]
@@ -128,7 +130,6 @@ 
#![feature(hasher_prefixfree_extras)]

#![feature(inline_const)]

#![feature(inplace_iteration)]

#![cfg_attr(test, feature(is_sorted))]

#![feature(iter_advance_by)]

#![feature(iter_next_chunk)]

#![feature(iter_repeat_n)]
@@ -136,8 +137,6 @@ 
#![feature(maybe_uninit_slice)]

#![feature(maybe_uninit_uninit_array)]

#![feature(maybe_uninit_uninit_array_transpose)]

#![cfg_attr(test, feature(new_uninit))]

#![feature(nonnull_slice_from_raw_parts)]

#![feature(pattern)]

#![feature(pointer_byte_offsets)]

#![feature(provide_any)]
@@ -153,6 +152,7 @@ 
#![feature(slice_ptr_get)]

#![feature(slice_ptr_len)]

#![feature(slice_range)]

#![feature(std_internals)]

#![feature(str_internals)]

#![feature(strict_provenance)]

#![feature(trusted_len)]
@@ -163,40 +163,42 @@ 
#![feature(unicode_internals)]

#![feature(unsize)]

#![feature(utf8_chunks)]

#![feature(std_internals)]

// tidy-alphabetical-end

//

// Language features:

// tidy-alphabetical-start

#![cfg_attr(not(test), feature(generator_trait))]

#![cfg_attr(test, feature(panic_update_hook))]

#![cfg_attr(test, feature(test))]

#![feature(allocator_internals)]

#![feature(allow_internal_unstable)]

#![feature(associated_type_bounds)]

#![feature(c_unwind)]

#![feature(cfg_sanitize)]

#![feature(const_deref)]

#![feature(const_mut_refs)]

#![feature(const_ptr_write)]

#![feature(const_precise_live_drops)]

#![feature(const_ptr_write)]

#![feature(const_trait_impl)]

#![feature(const_try)]

#![feature(dropck_eyepatch)]

#![feature(exclusive_range_pattern)]

#![feature(fundamental)]

#![cfg_attr(not(test), feature(generator_trait))]

#![feature(hashmap_internals)]

#![feature(lang_items)]

#![feature(min_specialization)]

#![feature(multiple_supertrait_upcastable)]

#![feature(negative_impls)]

#![feature(never_type)]

#![feature(pointer_is_aligned)]

#![feature(rustc_allow_const_fn_unstable)]

#![feature(rustc_attrs)]

#![feature(pointer_is_aligned)]

#![feature(slice_internals)]

#![feature(staged_api)]

#![feature(stmt_expr_attributes)]

#![cfg_attr(test, feature(test))]

#![feature(unboxed_closures)]

#![feature(unsized_fn_params)]

#![feature(c_unwind)]

#![feature(with_negative_coherence)]

#![cfg_attr(test, feature(panic_update_hook))]

// tidy-alphabetical-end

//

// Rustdoc features:

#![feature(doc_cfg)]