Merging upstream version 1.76.0+dfsg1.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

5 files changed, 0 insertions, 2955 deletions

diff --git a/vendor/hashbrown-0.12.3/src/raw/alloc.rs b/vendor/hashbrown-0.12.3/src/raw/alloc.rs
deleted file mode 100644
index ba09ea9de..000000000
--- a/vendor/hashbrown-0.12.3/src/raw/alloc.rs
+++ /dev/null
@@ -1,73 +0,0 @@
-pub(crate) use self::inner::{do_alloc, Allocator, Global};
-
-#[cfg(feature = "nightly")]
-mod inner {
-    use crate::alloc::alloc::Layout;
-    pub use crate::alloc::alloc::{Allocator, Global};
-    use core::ptr::NonNull;
-
-    #[allow(clippy::map_err_ignore)]
-    pub fn do_alloc<A: Allocator>(alloc: &A, layout: Layout) -> Result<NonNull<u8>, ()> {
-        match alloc.allocate(layout) {
-            Ok(ptr) => Ok(ptr.as_non_null_ptr()),
-            Err(_) => Err(()),
-        }
-    }
-
-    #[cfg(feature = "bumpalo")]
-    unsafe impl Allocator for crate::BumpWrapper<'_> {
-        #[inline]
-        fn allocate(&self, layout: Layout) -> Result<NonNull<[u8]>, core::alloc::AllocError> {
-            match self.0.try_alloc_layout(layout) {
-                Ok(ptr) => Ok(NonNull::slice_from_raw_parts(ptr, layout.size())),
-                Err(_) => Err(core::alloc::AllocError),
-            }
-        }
-        #[inline]
-        unsafe fn deallocate(&self, _ptr: NonNull<u8>, _layout: Layout) {}
-    }
-}
-
-#[cfg(not(feature = "nightly"))]
-mod inner {
-    use crate::alloc::alloc::{alloc, dealloc, Layout};
-    use core::ptr::NonNull;
-
-    #[allow(clippy::missing_safety_doc)] // not exposed outside of this crate
-    pub unsafe trait Allocator {
-        fn allocate(&self, layout: Layout) -> Result<NonNull<u8>, ()>;
-        unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout);
-    }
-
-    #[derive(Copy, Clone)]
-    pub struct Global;
-    unsafe impl Allocator for Global {
-        #[inline]
-        fn allocate(&self, layout: Layout) -> Result<NonNull<u8>, ()> {
-            unsafe { NonNull::new(alloc(layout)).ok_or(()) }
-        }
-        #[inline]
-        unsafe fn deallocate(&self, ptr: NonNull<u8>, layout: Layout) {
-            dealloc(ptr.as_ptr(), layout);
-        }
-    }
-    impl Default for Global {
-        #[inline]
-        fn default() -> Self {
-            Global
-        }
-    }
-
-    pub fn do_alloc<A: Allocator>(alloc: &A, layout: Layout) -> Result<NonNull<u8>, ()> {
-        alloc.allocate(layout)
-    }
-
-    #[cfg(feature = "bumpalo")]
-    unsafe impl Allocator for crate::BumpWrapper<'_> {
-        #[allow(clippy::map_err_ignore)]
-        fn allocate(&self, layout: Layout) -> Result<NonNull<u8>, ()> {
-            self.0.try_alloc_layout(layout).map_err(|_| ())
-        }
-        unsafe fn deallocate(&self, _ptr: NonNull<u8>, _layout: Layout) {}
-    }
-}
diff --git a/vendor/hashbrown-0.12.3/src/raw/bitmask.rs b/vendor/hashbrown-0.12.3/src/raw/bitmask.rs
deleted file mode 100644
index 7d4f9fc38..000000000
--- a/vendor/hashbrown-0.12.3/src/raw/bitmask.rs
+++ /dev/null
@@ -1,122 +0,0 @@
-use super::imp::{BitMaskWord, BITMASK_MASK, BITMASK_STRIDE};
-#[cfg(feature = "nightly")]
-use core::intrinsics;
-
-/// A bit mask which contains the result of a `Match` operation on a `Group` and
-/// allows iterating through them.
-///
-/// The bit mask is arranged so that low-order bits represent lower memory
-/// addresses for group match results.
-///
-/// For implementation reasons, the bits in the set may be sparsely packed, so
-/// that there is only one bit-per-byte used (the high bit, 7). If this is the
-/// case, `BITMASK_STRIDE` will be 8 to indicate a divide-by-8 should be
-/// performed on counts/indices to normalize this difference. `BITMASK_MASK` is
-/// similarly a mask of all the actually-used bits.
-#[derive(Copy, Clone)]
-pub struct BitMask(pub BitMaskWord);
-
-#[allow(clippy::use_self)]
-impl BitMask {
-    /// Returns a new `BitMask` with all bits inverted.
-    #[inline]
-    #[must_use]
-    pub fn invert(self) -> Self {
-        BitMask(self.0 ^ BITMASK_MASK)
-    }
-
-    /// Flip the bit in the mask for the entry at the given index.
-    ///
-    /// Returns the bit's previous state.
-    #[inline]
-    #[allow(clippy::cast_ptr_alignment)]
-    #[cfg(feature = "raw")]
-    pub unsafe fn flip(&mut self, index: usize) -> bool {
-        // NOTE: The + BITMASK_STRIDE - 1 is to set the high bit.
-        let mask = 1 << (index * BITMASK_STRIDE + BITMASK_STRIDE - 1);
-        self.0 ^= mask;
-        // The bit was set if the bit is now 0.
-        self.0 & mask == 0
-    }
-
-    /// Returns a new `BitMask` with the lowest bit removed.
-    #[inline]
-    #[must_use]
-    pub fn remove_lowest_bit(self) -> Self {
-        BitMask(self.0 & (self.0 - 1))
-    }
-    /// Returns whether the `BitMask` has at least one set bit.
-    #[inline]
-    pub fn any_bit_set(self) -> bool {
-        self.0 != 0
-    }
-
-    /// Returns the first set bit in the `BitMask`, if there is one.
-    #[inline]
-    pub fn lowest_set_bit(self) -> Option<usize> {
-        if self.0 == 0 {
-            None
-        } else {
-            Some(unsafe { self.lowest_set_bit_nonzero() })
-        }
-    }
-
-    /// Returns the first set bit in the `BitMask`, if there is one. The
-    /// bitmask must not be empty.
-    #[inline]
-    #[cfg(feature = "nightly")]
-    pub unsafe fn lowest_set_bit_nonzero(self) -> usize {
-        intrinsics::cttz_nonzero(self.0) as usize / BITMASK_STRIDE
-    }
-    #[inline]
-    #[cfg(not(feature = "nightly"))]
-    pub unsafe fn lowest_set_bit_nonzero(self) -> usize {
-        self.trailing_zeros()
-    }
-
-    /// Returns the number of trailing zeroes in the `BitMask`.
-    #[inline]
-    pub fn trailing_zeros(self) -> usize {
-        // ARM doesn't have a trailing_zeroes instruction, and instead uses
-        // reverse_bits (RBIT) + leading_zeroes (CLZ). However older ARM
-        // versions (pre-ARMv7) don't have RBIT and need to emulate it
-        // instead. Since we only have 1 bit set in each byte on ARM, we can
-        // use swap_bytes (REV) + leading_zeroes instead.
-        if cfg!(target_arch = "arm") && BITMASK_STRIDE % 8 == 0 {
-            self.0.swap_bytes().leading_zeros() as usize / BITMASK_STRIDE
-        } else {
-            self.0.trailing_zeros() as usize / BITMASK_STRIDE
-        }
-    }
-
-    /// Returns the number of leading zeroes in the `BitMask`.
-    #[inline]
-    pub fn leading_zeros(self) -> usize {
-        self.0.leading_zeros() as usize / BITMASK_STRIDE
-    }
-}
-
-impl IntoIterator for BitMask {
-    type Item = usize;
-    type IntoIter = BitMaskIter;
-
-    #[inline]
-    fn into_iter(self) -> BitMaskIter {
-        BitMaskIter(self)
-    }
-}
-
-/// Iterator over the contents of a `BitMask`, returning the indices of set
-/// bits.
-pub struct BitMaskIter(BitMask);
-
-impl Iterator for BitMaskIter {
-    type Item = usize;
-
-    #[inline]
-    fn next(&mut self) -> Option<usize> {
-        let bit = self.0.lowest_set_bit()?;
-        self.0 = self.0.remove_lowest_bit();
-        Some(bit)
-    }
-}
diff --git a/vendor/hashbrown-0.12.3/src/raw/generic.rs b/vendor/hashbrown-0.12.3/src/raw/generic.rs
deleted file mode 100644
index b4d31e62c..000000000
--- a/vendor/hashbrown-0.12.3/src/raw/generic.rs
+++ /dev/null
@@ -1,154 +0,0 @@
-use super::bitmask::BitMask;
-use super::EMPTY;
-use core::{mem, ptr};
-
-// Use the native word size as the group size. Using a 64-bit group size on
-// a 32-bit architecture will just end up being more expensive because
-// shifts and multiplies will need to be emulated.
-#[cfg(any(
-    target_pointer_width = "64",
-    target_arch = "aarch64",
-    target_arch = "x86_64",
-    target_arch = "wasm32",
-))]
-type GroupWord = u64;
-#[cfg(all(
-    target_pointer_width = "32",
-    not(target_arch = "aarch64"),
-    not(target_arch = "x86_64"),
-    not(target_arch = "wasm32"),
-))]
-type GroupWord = u32;
-
-pub type BitMaskWord = GroupWord;
-pub const BITMASK_STRIDE: usize = 8;
-// We only care about the highest bit of each byte for the mask.
-#[allow(clippy::cast_possible_truncation, clippy::unnecessary_cast)]
-pub const BITMASK_MASK: BitMaskWord = 0x8080_8080_8080_8080_u64 as GroupWord;
-
-/// Helper function to replicate a byte across a `GroupWord`.
-#[inline]
-fn repeat(byte: u8) -> GroupWord {
-    GroupWord::from_ne_bytes([byte; Group::WIDTH])
-}
-
-/// Abstraction over a group of control bytes which can be scanned in
-/// parallel.
-///
-/// This implementation uses a word-sized integer.
-#[derive(Copy, Clone)]
-pub struct Group(GroupWord);
-
-// We perform all operations in the native endianness, and convert to
-// little-endian just before creating a BitMask. The can potentially
-// enable the compiler to eliminate unnecessary byte swaps if we are
-// only checking whether a BitMask is empty.
-#[allow(clippy::use_self)]
-impl Group {
-    /// Number of bytes in the group.
-    pub const WIDTH: usize = mem::size_of::<Self>();
-
-    /// Returns a full group of empty bytes, suitable for use as the initial
-    /// value for an empty hash table.
-    ///
-    /// This is guaranteed to be aligned to the group size.
-    #[inline]
-    pub const fn static_empty() -> &'static [u8; Group::WIDTH] {
-        #[repr(C)]
-        struct AlignedBytes {
-            _align: [Group; 0],
-            bytes: [u8; Group::WIDTH],
-        }
-        const ALIGNED_BYTES: AlignedBytes = AlignedBytes {
-            _align: [],
-            bytes: [EMPTY; Group::WIDTH],
-        };
-        &ALIGNED_BYTES.bytes
-    }
-
-    /// Loads a group of bytes starting at the given address.
-    #[inline]
-    #[allow(clippy::cast_ptr_alignment)] // unaligned load
-    pub unsafe fn load(ptr: *const u8) -> Self {
-        Group(ptr::read_unaligned(ptr.cast()))
-    }
-
-    /// Loads a group of bytes starting at the given address, which must be
-    /// aligned to `mem::align_of::<Group>()`.
-    #[inline]
-    #[allow(clippy::cast_ptr_alignment)]
-    pub unsafe fn load_aligned(ptr: *const u8) -> Self {
-        // FIXME: use align_offset once it stabilizes
-        debug_assert_eq!(ptr as usize & (mem::align_of::<Self>() - 1), 0);
-        Group(ptr::read(ptr.cast()))
-    }
-
-    /// Stores the group of bytes to the given address, which must be
-    /// aligned to `mem::align_of::<Group>()`.
-    #[inline]
-    #[allow(clippy::cast_ptr_alignment)]
-    pub unsafe fn store_aligned(self, ptr: *mut u8) {
-        // FIXME: use align_offset once it stabilizes
-        debug_assert_eq!(ptr as usize & (mem::align_of::<Self>() - 1), 0);
-        ptr::write(ptr.cast(), self.0);
-    }
-
-    /// Returns a `BitMask` indicating all bytes in the group which *may*
-    /// have the given value.
-    ///
-    /// This function may return a false positive in certain cases where
-    /// the byte in the group differs from the searched value only in its
-    /// lowest bit. This is fine because:
-    /// - This never happens for `EMPTY` and `DELETED`, only full entries.
-    /// - The check for key equality will catch these.
-    /// - This only happens if there is at least 1 true match.
-    /// - The chance of this happening is very low (< 1% chance per byte).
-    #[inline]
-    pub fn match_byte(self, byte: u8) -> BitMask {
-        // This algorithm is derived from
-        // https://graphics.stanford.edu/~seander/bithacks.html##ValueInWord
-        let cmp = self.0 ^ repeat(byte);
-        BitMask((cmp.wrapping_sub(repeat(0x01)) & !cmp & repeat(0x80)).to_le())
-    }
-
-    /// Returns a `BitMask` indicating all bytes in the group which are
-    /// `EMPTY`.
-    #[inline]
-    pub fn match_empty(self) -> BitMask {
-        // If the high bit is set, then the byte must be either:
-        // 1111_1111 (EMPTY) or 1000_0000 (DELETED).
-        // So we can just check if the top two bits are 1 by ANDing them.
-        BitMask((self.0 & (self.0 << 1) & repeat(0x80)).to_le())
-    }
-
-    /// Returns a `BitMask` indicating all bytes in the group which are
-    /// `EMPTY` or `DELETED`.
-    #[inline]
-    pub fn match_empty_or_deleted(self) -> BitMask {
-        // A byte is EMPTY or DELETED iff the high bit is set
-        BitMask((self.0 & repeat(0x80)).to_le())
-    }
-
-    /// Returns a `BitMask` indicating all bytes in the group which are full.
-    #[inline]
-    pub fn match_full(self) -> BitMask {
-        self.match_empty_or_deleted().invert()
-    }
-
-    /// Performs the following transformation on all bytes in the group:
-    /// - `EMPTY => EMPTY`
-    /// - `DELETED => EMPTY`
-    /// - `FULL => DELETED`
-    #[inline]
-    pub fn convert_special_to_empty_and_full_to_deleted(self) -> Self {
-        // Map high_bit = 1 (EMPTY or DELETED) to 1111_1111
-        // and high_bit = 0 (FULL) to 1000_0000
-        //
-        // Here's this logic expanded to concrete values:
-        //   let full = 1000_0000 (true) or 0000_0000 (false)
-        //   !1000_0000 + 1 = 0111_1111 + 1 = 1000_0000 (no carry)
-        //   !0000_0000 + 0 = 1111_1111 + 0 = 1111_1111 (no carry)
-        let full = !self.0 & repeat(0x80);
-        Group(!full + (full >> 7))
-    }
-}
diff --git a/vendor/hashbrown-0.12.3/src/raw/mod.rs b/vendor/hashbrown-0.12.3/src/raw/mod.rs
deleted file mode 100644
index 211b818a5..000000000
--- a/vendor/hashbrown-0.12.3/src/raw/mod.rs
+++ /dev/null
@@ -1,2460 +0,0 @@
-use crate::alloc::alloc::{handle_alloc_error, Layout};
-use crate::scopeguard::{guard, ScopeGuard};
-use crate::TryReserveError;
-use core::iter::FusedIterator;
-use core::marker::PhantomData;
-use core::mem;
-use core::mem::ManuallyDrop;
-use core::mem::MaybeUninit;
-use core::ptr::NonNull;
-use core::{hint, ptr};
-
-cfg_if! {
-    // Use the SSE2 implementation if possible: it allows us to scan 16 buckets
-    // at once instead of 8. We don't bother with AVX since it would require
-    // runtime dispatch and wouldn't gain us much anyways: the probability of
-    // finding a match drops off drastically after the first few buckets.
-    //
-    // I attempted an implementation on ARM using NEON instructions, but it
-    // turns out that most NEON instructions have multi-cycle latency, which in
-    // the end outweighs any gains over the generic implementation.
-    if #[cfg(all(
-        target_feature = "sse2",
-        any(target_arch = "x86", target_arch = "x86_64"),
-        not(miri)
-    ))] {
-        mod sse2;
-        use sse2 as imp;
-    } else {
-        #[path = "generic.rs"]
-        mod generic;
-        use generic as imp;
-    }
-}
-
-mod alloc;
-pub(crate) use self::alloc::{do_alloc, Allocator, Global};
-
-mod bitmask;
-
-use self::bitmask::{BitMask, BitMaskIter};
-use self::imp::Group;
-
-// Branch prediction hint. This is currently only available on nightly but it
-// consistently improves performance by 10-15%.
-#[cfg(feature = "nightly")]
-use core::intrinsics::{likely, unlikely};
-
-// On stable we can use #[cold] to get a equivalent effect: this attributes
-// suggests that the function is unlikely to be called
-#[cfg(not(feature = "nightly"))]
-#[inline]
-#[cold]
-fn cold() {}
-
-#[cfg(not(feature = "nightly"))]
-#[inline]
-fn likely(b: bool) -> bool {
-    if !b {
-        cold();
-    }
-    b
-}
-#[cfg(not(feature = "nightly"))]
-#[inline]
-fn unlikely(b: bool) -> bool {
-    if b {
-        cold();
-    }
-    b
-}
-
-#[inline]
-unsafe fn offset_from<T>(to: *const T, from: *const T) -> usize {
-    to.offset_from(from) as usize
-}
-
-/// Whether memory allocation errors should return an error or abort.
-#[derive(Copy, Clone)]
-enum Fallibility {
-    Fallible,
-    Infallible,
-}
-
-impl Fallibility {
-    /// Error to return on capacity overflow.
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn capacity_overflow(self) -> TryReserveError {
-        match self {
-            Fallibility::Fallible => TryReserveError::CapacityOverflow,
-            Fallibility::Infallible => panic!("Hash table capacity overflow"),
-        }
-    }
-
-    /// Error to return on allocation error.
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn alloc_err(self, layout: Layout) -> TryReserveError {
-        match self {
-            Fallibility::Fallible => TryReserveError::AllocError { layout },
-            Fallibility::Infallible => handle_alloc_error(layout),
-        }
-    }
-}
-
-/// Control byte value for an empty bucket.
-const EMPTY: u8 = 0b1111_1111;
-
-/// Control byte value for a deleted bucket.
-const DELETED: u8 = 0b1000_0000;
-
-/// Checks whether a control byte represents a full bucket (top bit is clear).
-#[inline]
-fn is_full(ctrl: u8) -> bool {
-    ctrl & 0x80 == 0
-}
-
-/// Checks whether a control byte represents a special value (top bit is set).
-#[inline]
-fn is_special(ctrl: u8) -> bool {
-    ctrl & 0x80 != 0
-}
-
-/// Checks whether a special control value is EMPTY (just check 1 bit).
-#[inline]
-fn special_is_empty(ctrl: u8) -> bool {
-    debug_assert!(is_special(ctrl));
-    ctrl & 0x01 != 0
-}
-
-/// Primary hash function, used to select the initial bucket to probe from.
-#[inline]
-#[allow(clippy::cast_possible_truncation)]
-fn h1(hash: u64) -> usize {
-    // On 32-bit platforms we simply ignore the higher hash bits.
-    hash as usize
-}
-
-/// Secondary hash function, saved in the low 7 bits of the control byte.
-#[inline]
-#[allow(clippy::cast_possible_truncation)]
-fn h2(hash: u64) -> u8 {
-    // Grab the top 7 bits of the hash. While the hash is normally a full 64-bit
-    // value, some hash functions (such as FxHash) produce a usize result
-    // instead, which means that the top 32 bits are 0 on 32-bit platforms.
-    let hash_len = usize::min(mem::size_of::<usize>(), mem::size_of::<u64>());
-    let top7 = hash >> (hash_len * 8 - 7);
-    (top7 & 0x7f) as u8 // truncation
-}
-
-/// Probe sequence based on triangular numbers, which is guaranteed (since our
-/// table size is a power of two) to visit every group of elements exactly once.
-///
-/// A triangular probe has us jump by 1 more group every time. So first we
-/// jump by 1 group (meaning we just continue our linear scan), then 2 groups
-/// (skipping over 1 group), then 3 groups (skipping over 2 groups), and so on.
-///
-/// Proof that the probe will visit every group in the table:
-/// <https://fgiesen.wordpress.com/2015/02/22/triangular-numbers-mod-2n/>
-struct ProbeSeq {
-    pos: usize,
-    stride: usize,
-}
-
-impl ProbeSeq {
-    #[inline]
-    fn move_next(&mut self, bucket_mask: usize) {
-        // We should have found an empty bucket by now and ended the probe.
-        debug_assert!(
-            self.stride <= bucket_mask,
-            "Went past end of probe sequence"
-        );
-
-        self.stride += Group::WIDTH;
-        self.pos += self.stride;
-        self.pos &= bucket_mask;
-    }
-}
-
-/// Returns the number of buckets needed to hold the given number of items,
-/// taking the maximum load factor into account.
-///
-/// Returns `None` if an overflow occurs.
-// Workaround for emscripten bug emscripten-core/emscripten-fastcomp#258
-#[cfg_attr(target_os = "emscripten", inline(never))]
-#[cfg_attr(not(target_os = "emscripten"), inline)]
-fn capacity_to_buckets(cap: usize) -> Option<usize> {
-    debug_assert_ne!(cap, 0);
-
-    // For small tables we require at least 1 empty bucket so that lookups are
-    // guaranteed to terminate if an element doesn't exist in the table.
-    if cap < 8 {
-        // We don't bother with a table size of 2 buckets since that can only
-        // hold a single element. Instead we skip directly to a 4 bucket table
-        // which can hold 3 elements.
-        return Some(if cap < 4 { 4 } else { 8 });
-    }
-
-    // Otherwise require 1/8 buckets to be empty (87.5% load)
-    //
-    // Be careful when modifying this, calculate_layout relies on the
-    // overflow check here.
-    let adjusted_cap = cap.checked_mul(8)? / 7;
-
-    // Any overflows will have been caught by the checked_mul. Also, any
-    // rounding errors from the division above will be cleaned up by
-    // next_power_of_two (which can't overflow because of the previous division).
-    Some(adjusted_cap.next_power_of_two())
-}
-
-/// Returns the maximum effective capacity for the given bucket mask, taking
-/// the maximum load factor into account.
-#[inline]
-fn bucket_mask_to_capacity(bucket_mask: usize) -> usize {
-    if bucket_mask < 8 {
-        // For tables with 1/2/4/8 buckets, we always reserve one empty slot.
-        // Keep in mind that the bucket mask is one less than the bucket count.
-        bucket_mask
-    } else {
-        // For larger tables we reserve 12.5% of the slots as empty.
-        ((bucket_mask + 1) / 8) * 7
-    }
-}
-
-/// Helper which allows the max calculation for ctrl_align to be statically computed for each T
-/// while keeping the rest of `calculate_layout_for` independent of `T`
-#[derive(Copy, Clone)]
-struct TableLayout {
-    size: usize,
-    ctrl_align: usize,
-}
-
-impl TableLayout {
-    #[inline]
-    fn new<T>() -> Self {
-        let layout = Layout::new::<T>();
-        Self {
-            size: layout.size(),
-            ctrl_align: usize::max(layout.align(), Group::WIDTH),
-        }
-    }
-
-    #[inline]
-    fn calculate_layout_for(self, buckets: usize) -> Option<(Layout, usize)> {
-        debug_assert!(buckets.is_power_of_two());
-
-        let TableLayout { size, ctrl_align } = self;
-        // Manual layout calculation since Layout methods are not yet stable.
-        let ctrl_offset =
-            size.checked_mul(buckets)?.checked_add(ctrl_align - 1)? & !(ctrl_align - 1);
-        let len = ctrl_offset.checked_add(buckets + Group::WIDTH)?;
-
-        Some((
-            unsafe { Layout::from_size_align_unchecked(len, ctrl_align) },
-            ctrl_offset,
-        ))
-    }
-}
-
-/// Returns a Layout which describes the allocation required for a hash table,
-/// and the offset of the control bytes in the allocation.
-/// (the offset is also one past last element of buckets)
-///
-/// Returns `None` if an overflow occurs.
-#[cfg_attr(feature = "inline-more", inline)]
-fn calculate_layout<T>(buckets: usize) -> Option<(Layout, usize)> {
-    TableLayout::new::<T>().calculate_layout_for(buckets)
-}
-
-/// A reference to a hash table bucket containing a `T`.
-///
-/// This is usually just a pointer to the element itself. However if the element
-/// is a ZST, then we instead track the index of the element in the table so
-/// that `erase` works properly.
-pub struct Bucket<T> {
-    // Actually it is pointer to next element than element itself
-    // this is needed to maintain pointer arithmetic invariants
-    // keeping direct pointer to element introduces difficulty.
-    // Using `NonNull` for variance and niche layout
-    ptr: NonNull<T>,
-}
-
-// This Send impl is needed for rayon support. This is safe since Bucket is
-// never exposed in a public API.
-unsafe impl<T> Send for Bucket<T> {}
-
-impl<T> Clone for Bucket<T> {
-    #[inline]
-    fn clone(&self) -> Self {
-        Self { ptr: self.ptr }
-    }
-}
-
-impl<T> Bucket<T> {
-    #[inline]
-    unsafe fn from_base_index(base: NonNull<T>, index: usize) -> Self {
-        let ptr = if mem::size_of::<T>() == 0 {
-            // won't overflow because index must be less than length
-            (index + 1) as *mut T
-        } else {
-            base.as_ptr().sub(index)
-        };
-        Self {
-            ptr: NonNull::new_unchecked(ptr),
-        }
-    }
-    #[inline]
-    unsafe fn to_base_index(&self, base: NonNull<T>) -> usize {
-        if mem::size_of::<T>() == 0 {
-            self.ptr.as_ptr() as usize - 1
-        } else {
-            offset_from(base.as_ptr(), self.ptr.as_ptr())
-        }
-    }
-    #[inline]
-    pub fn as_ptr(&self) -> *mut T {
-        if mem::size_of::<T>() == 0 {
-            // Just return an arbitrary ZST pointer which is properly aligned
-            mem::align_of::<T>() as *mut T
-        } else {
-            unsafe { self.ptr.as_ptr().sub(1) }
-        }
-    }
-    #[inline]
-    unsafe fn next_n(&self, offset: usize) -> Self {
-        let ptr = if mem::size_of::<T>() == 0 {
-            (self.ptr.as_ptr() as usize + offset) as *mut T
-        } else {
-            self.ptr.as_ptr().sub(offset)
-        };
-        Self {
-            ptr: NonNull::new_unchecked(ptr),
-        }
-    }
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub unsafe fn drop(&self) {
-        self.as_ptr().drop_in_place();
-    }
-    #[inline]
-    pub unsafe fn read(&self) -> T {
-        self.as_ptr().read()
-    }
-    #[inline]
-    pub unsafe fn write(&self, val: T) {
-        self.as_ptr().write(val);
-    }
-    #[inline]
-    pub unsafe fn as_ref<'a>(&self) -> &'a T {
-        &*self.as_ptr()
-    }
-    #[inline]
-    pub unsafe fn as_mut<'a>(&self) -> &'a mut T {
-        &mut *self.as_ptr()
-    }
-    #[cfg(feature = "raw")]
-    #[inline]
-    pub unsafe fn copy_from_nonoverlapping(&self, other: &Self) {
-        self.as_ptr().copy_from_nonoverlapping(other.as_ptr(), 1);
-    }
-}
-
-/// A raw hash table with an unsafe API.
-pub struct RawTable<T, A: Allocator + Clone = Global> {
-    table: RawTableInner<A>,
-    // Tell dropck that we own instances of T.
-    marker: PhantomData<T>,
-}
-
-/// Non-generic part of `RawTable` which allows functions to be instantiated only once regardless
-/// of how many different key-value types are used.
-struct RawTableInner<A> {
-    // Mask to get an index from a hash value. The value is one less than the
-    // number of buckets in the table.
-    bucket_mask: usize,
-
-    // [Padding], T1, T2, ..., Tlast, C1, C2, ...
-    //                                ^ points here
-    ctrl: NonNull<u8>,
-
-    // Number of elements that can be inserted before we need to grow the table
-    growth_left: usize,
-
-    // Number of elements in the table, only really used by len()
-    items: usize,
-
-    alloc: A,
-}
-
-impl<T> RawTable<T, Global> {
-    /// Creates a new empty hash table without allocating any memory.
-    ///
-    /// In effect this returns a table with exactly 1 bucket. However we can
-    /// leave the data pointer dangling since that bucket is never written to
-    /// due to our load factor forcing us to always have at least 1 free bucket.
-    #[inline]
-    pub const fn new() -> Self {
-        Self {
-            table: RawTableInner::new_in(Global),
-            marker: PhantomData,
-        }
-    }
-
-    /// Attempts to allocate a new hash table with at least enough capacity
-    /// for inserting the given number of elements without reallocating.
-    #[cfg(feature = "raw")]
-    pub fn try_with_capacity(capacity: usize) -> Result<Self, TryReserveError> {
-        Self::try_with_capacity_in(capacity, Global)
-    }
-
-    /// Allocates a new hash table with at least enough capacity for inserting
-    /// the given number of elements without reallocating.
-    pub fn with_capacity(capacity: usize) -> Self {
-        Self::with_capacity_in(capacity, Global)
-    }
-}
-
-impl<T, A: Allocator + Clone> RawTable<T, A> {
-    /// Creates a new empty hash table without allocating any memory, using the
-    /// given allocator.
-    ///
-    /// In effect this returns a table with exactly 1 bucket. However we can
-    /// leave the data pointer dangling since that bucket is never written to
-    /// due to our load factor forcing us to always have at least 1 free bucket.
-    #[inline]
-    pub fn new_in(alloc: A) -> Self {
-        Self {
-            table: RawTableInner::new_in(alloc),
-            marker: PhantomData,
-        }
-    }
-
-    /// Allocates a new hash table with the given number of buckets.
-    ///
-    /// The control bytes are left uninitialized.
-    #[cfg_attr(feature = "inline-more", inline)]
-    unsafe fn new_uninitialized(
-        alloc: A,
-        buckets: usize,
-        fallibility: Fallibility,
-    ) -> Result<Self, TryReserveError> {
-        debug_assert!(buckets.is_power_of_two());
-
-        Ok(Self {
-            table: RawTableInner::new_uninitialized(
-                alloc,
-                TableLayout::new::<T>(),
-                buckets,
-                fallibility,
-            )?,
-            marker: PhantomData,
-        })
-    }
-
-    /// Attempts to allocate a new hash table with at least enough capacity
-    /// for inserting the given number of elements without reallocating.
-    fn fallible_with_capacity(
-        alloc: A,
-        capacity: usize,
-        fallibility: Fallibility,
-    ) -> Result<Self, TryReserveError> {
-        Ok(Self {
-            table: RawTableInner::fallible_with_capacity(
-                alloc,
-                TableLayout::new::<T>(),
-                capacity,
-                fallibility,
-            )?,
-            marker: PhantomData,
-        })
-    }
-
-    /// Attempts to allocate a new hash table using the given allocator, with at least enough
-    /// capacity for inserting the given number of elements without reallocating.
-    #[cfg(feature = "raw")]
-    pub fn try_with_capacity_in(capacity: usize, alloc: A) -> Result<Self, TryReserveError> {
-        Self::fallible_with_capacity(alloc, capacity, Fallibility::Fallible)
-    }
-
-    /// Allocates a new hash table using the given allocator, with at least enough capacity for
-    /// inserting the given number of elements without reallocating.
-    pub fn with_capacity_in(capacity: usize, alloc: A) -> Self {
-        // Avoid `Result::unwrap_or_else` because it bloats LLVM IR.
-        match Self::fallible_with_capacity(alloc, capacity, Fallibility::Infallible) {
-            Ok(capacity) => capacity,
-            Err(_) => unsafe { hint::unreachable_unchecked() },
-        }
-    }
-
-    /// Returns a reference to the underlying allocator.
-    #[inline]
-    pub fn allocator(&self) -> &A {
-        &self.table.alloc
-    }
-
-    /// Deallocates the table without dropping any entries.
-    #[cfg_attr(feature = "inline-more", inline)]
-    unsafe fn free_buckets(&mut self) {
-        self.table.free_buckets(TableLayout::new::<T>());
-    }
-
-    /// Returns pointer to one past last element of data table.
-    #[inline]
-    pub unsafe fn data_end(&self) -> NonNull<T> {
-        NonNull::new_unchecked(self.table.ctrl.as_ptr().cast())
-    }
-
-    /// Returns pointer to start of data table.
-    #[inline]
-    #[cfg(feature = "nightly")]
-    pub unsafe fn data_start(&self) -> *mut T {
-        self.data_end().as_ptr().wrapping_sub(self.buckets())
-    }
-
-    /// Returns the index of a bucket from a `Bucket`.
-    #[inline]
-    pub unsafe fn bucket_index(&self, bucket: &Bucket<T>) -> usize {
-        bucket.to_base_index(self.data_end())
-    }
-
-    /// Returns a pointer to an element in the table.
-    #[inline]
-    pub unsafe fn bucket(&self, index: usize) -> Bucket<T> {
-        debug_assert_ne!(self.table.bucket_mask, 0);
-        debug_assert!(index < self.buckets());
-        Bucket::from_base_index(self.data_end(), index)
-    }
-
-    /// Erases an element from the table without dropping it.
-    #[cfg_attr(feature = "inline-more", inline)]
-    #[deprecated(since = "0.8.1", note = "use erase or remove instead")]
-    pub unsafe fn erase_no_drop(&mut self, item: &Bucket<T>) {
-        let index = self.bucket_index(item);
-        self.table.erase(index);
-    }
-
-    /// Erases an element from the table, dropping it in place.
-    #[cfg_attr(feature = "inline-more", inline)]
-    #[allow(clippy::needless_pass_by_value)]
-    #[allow(deprecated)]
-    pub unsafe fn erase(&mut self, item: Bucket<T>) {
-        // Erase the element from the table first since drop might panic.
-        self.erase_no_drop(&item);
-        item.drop();
-    }
-
-    /// Finds and erases an element from the table, dropping it in place.
-    /// Returns true if an element was found.
-    #[cfg(feature = "raw")]
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn erase_entry(&mut self, hash: u64, eq: impl FnMut(&T) -> bool) -> bool {
-        // Avoid `Option::map` because it bloats LLVM IR.
-        if let Some(bucket) = self.find(hash, eq) {
-            unsafe {
-                self.erase(bucket);
-            }
-            true
-        } else {
-            false
-        }
-    }
-
-    /// Removes an element from the table, returning it.
-    #[cfg_attr(feature = "inline-more", inline)]
-    #[allow(clippy::needless_pass_by_value)]
-    #[allow(deprecated)]
-    pub unsafe fn remove(&mut self, item: Bucket<T>) -> T {
-        self.erase_no_drop(&item);
-        item.read()
-    }
-
-    /// Finds and removes an element from the table, returning it.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn remove_entry(&mut self, hash: u64, eq: impl FnMut(&T) -> bool) -> Option<T> {
-        // Avoid `Option::map` because it bloats LLVM IR.
-        match self.find(hash, eq) {
-            Some(bucket) => Some(unsafe { self.remove(bucket) }),
-            None => None,
-        }
-    }
-
-    /// Marks all table buckets as empty without dropping their contents.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn clear_no_drop(&mut self) {
-        self.table.clear_no_drop();
-    }
-
-    /// Removes all elements from the table without freeing the backing memory.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn clear(&mut self) {
-        // Ensure that the table is reset even if one of the drops panic
-        let mut self_ = guard(self, |self_| self_.clear_no_drop());
-        unsafe {
-            self_.drop_elements();
-        }
-    }
-
-    unsafe fn drop_elements(&mut self) {
-        if mem::needs_drop::<T>() && !self.is_empty() {
-            for item in self.iter() {
-                item.drop();
-            }
-        }
-    }
-
-    /// Shrinks the table to fit `max(self.len(), min_size)` elements.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn shrink_to(&mut self, min_size: usize, hasher: impl Fn(&T) -> u64) {
-        // Calculate the minimal number of elements that we need to reserve
-        // space for.
-        let min_size = usize::max(self.table.items, min_size);
-        if min_size == 0 {
-            *self = Self::new_in(self.table.alloc.clone());
-            return;
-        }
-
-        // Calculate the number of buckets that we need for this number of
-        // elements. If the calculation overflows then the requested bucket
-        // count must be larger than what we have right and nothing needs to be
-        // done.
-        let min_buckets = match capacity_to_buckets(min_size) {
-            Some(buckets) => buckets,
-            None => return,
-        };
-
-        // If we have more buckets than we need, shrink the table.
-        if min_buckets < self.buckets() {
-            // Fast path if the table is empty
-            if self.table.items == 0 {
-                *self = Self::with_capacity_in(min_size, self.table.alloc.clone());
-            } else {
-                // Avoid `Result::unwrap_or_else` because it bloats LLVM IR.
-                if self
-                    .resize(min_size, hasher, Fallibility::Infallible)
-                    .is_err()
-                {
-                    unsafe { hint::unreachable_unchecked() }
-                }
-            }
-        }
-    }
-
-    /// Ensures that at least `additional` items can be inserted into the table
-    /// without reallocation.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn reserve(&mut self, additional: usize, hasher: impl Fn(&T) -> u64) {
-        if additional > self.table.growth_left {
-            // Avoid `Result::unwrap_or_else` because it bloats LLVM IR.
-            if self
-                .reserve_rehash(additional, hasher, Fallibility::Infallible)
-                .is_err()
-            {
-                unsafe { hint::unreachable_unchecked() }
-            }
-        }
-    }
-
-    /// Tries to ensure that at least `additional` items can be inserted into
-    /// the table without reallocation.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn try_reserve(
-        &mut self,
-        additional: usize,
-        hasher: impl Fn(&T) -> u64,
-    ) -> Result<(), TryReserveError> {
-        if additional > self.table.growth_left {
-            self.reserve_rehash(additional, hasher, Fallibility::Fallible)
-        } else {
-            Ok(())
-        }
-    }
-
-    /// Out-of-line slow path for `reserve` and `try_reserve`.
-    #[cold]
-    #[inline(never)]
-    fn reserve_rehash(
-        &mut self,
-        additional: usize,
-        hasher: impl Fn(&T) -> u64,
-        fallibility: Fallibility,
-    ) -> Result<(), TryReserveError> {
-        unsafe {
-            self.table.reserve_rehash_inner(
-                additional,
-                &|table, index| hasher(table.bucket::<T>(index).as_ref()),
-                fallibility,
-                TableLayout::new::<T>(),
-                if mem::needs_drop::<T>() {
-                    Some(mem::transmute(ptr::drop_in_place::<T> as unsafe fn(*mut T)))
-                } else {
-                    None
-                },
-            )
-        }
-    }
-
-    /// Allocates a new table of a different size and moves the contents of the
-    /// current table into it.
-    fn resize(
-        &mut self,
-        capacity: usize,
-        hasher: impl Fn(&T) -> u64,
-        fallibility: Fallibility,
-    ) -> Result<(), TryReserveError> {
-        unsafe {
-            self.table.resize_inner(
-                capacity,
-                &|table, index| hasher(table.bucket::<T>(index).as_ref()),
-                fallibility,
-                TableLayout::new::<T>(),
-            )
-        }
-    }
-
-    /// Inserts a new element into the table, and returns its raw bucket.
-    ///
-    /// This does not check if the given element already exists in the table.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn insert(&mut self, hash: u64, value: T, hasher: impl Fn(&T) -> u64) -> Bucket<T> {
-        unsafe {
-            let mut index = self.table.find_insert_slot(hash);
-
-            // We can avoid growing the table once we have reached our load
-            // factor if we are replacing a tombstone. This works since the
-            // number of EMPTY slots does not change in this case.
-            let old_ctrl = *self.table.ctrl(index);
-            if unlikely(self.table.growth_left == 0 && special_is_empty(old_ctrl)) {
-                self.reserve(1, hasher);
-                index = self.table.find_insert_slot(hash);
-            }
-
-            self.table.record_item_insert_at(index, old_ctrl, hash);
-
-            let bucket = self.bucket(index);
-            bucket.write(value);
-            bucket
-        }
-    }
-
-    /// Attempts to insert a new element without growing the table and return its raw bucket.
-    ///
-    /// Returns an `Err` containing the given element if inserting it would require growing the
-    /// table.
-    ///
-    /// This does not check if the given element already exists in the table.
-    #[cfg(feature = "raw")]
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn try_insert_no_grow(&mut self, hash: u64, value: T) -> Result<Bucket<T>, T> {
-        unsafe {
-            match self.table.prepare_insert_no_grow(hash) {
-                Ok(index) => {
-                    let bucket = self.bucket(index);
-                    bucket.write(value);
-                    Ok(bucket)
-                }
-                Err(()) => Err(value),
-            }
-        }
-    }
-
-    /// Inserts a new element into the table, and returns a mutable reference to it.
-    ///
-    /// This does not check if the given element already exists in the table.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn insert_entry(&mut self, hash: u64, value: T, hasher: impl Fn(&T) -> u64) -> &mut T {
-        unsafe { self.insert(hash, value, hasher).as_mut() }
-    }
-
-    /// Inserts a new element into the table, without growing the table.
-    ///
-    /// There must be enough space in the table to insert the new element.
-    ///
-    /// This does not check if the given element already exists in the table.
-    #[cfg_attr(feature = "inline-more", inline)]
-    #[cfg(any(feature = "raw", feature = "rustc-internal-api"))]
-    pub unsafe fn insert_no_grow(&mut self, hash: u64, value: T) -> Bucket<T> {
-        let (index, old_ctrl) = self.table.prepare_insert_slot(hash);
-        let bucket = self.table.bucket(index);
-
-        // If we are replacing a DELETED entry then we don't need to update
-        // the load counter.
-        self.table.growth_left -= special_is_empty(old_ctrl) as usize;
-
-        bucket.write(value);
-        self.table.items += 1;
-        bucket
-    }
-
-    /// Temporary removes a bucket, applying the given function to the removed
-    /// element and optionally put back the returned value in the same bucket.
-    ///
-    /// Returns `true` if the bucket still contains an element
-    ///
-    /// This does not check if the given bucket is actually occupied.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub unsafe fn replace_bucket_with<F>(&mut self, bucket: Bucket<T>, f: F) -> bool
-    where
-        F: FnOnce(T) -> Option<T>,
-    {
-        let index = self.bucket_index(&bucket);
-        let old_ctrl = *self.table.ctrl(index);
-        debug_assert!(is_full(old_ctrl));
-        let old_growth_left = self.table.growth_left;
-        let item = self.remove(bucket);
-        if let Some(new_item) = f(item) {
-            self.table.growth_left = old_growth_left;
-            self.table.set_ctrl(index, old_ctrl);
-            self.table.items += 1;
-            self.bucket(index).write(new_item);
-            true
-        } else {
-            false
-        }
-    }
-
-    /// Searches for an element in the table.
-    #[inline]
-    pub fn find(&self, hash: u64, mut eq: impl FnMut(&T) -> bool) -> Option<Bucket<T>> {
-        let result = self.table.find_inner(hash, &mut |index| unsafe {
-            eq(self.bucket(index).as_ref())
-        });
-
-        // Avoid `Option::map` because it bloats LLVM IR.
-        match result {
-            Some(index) => Some(unsafe { self.bucket(index) }),
-            None => None,
-        }
-    }
-
-    /// Gets a reference to an element in the table.
-    #[inline]
-    pub fn get(&self, hash: u64, eq: impl FnMut(&T) -> bool) -> Option<&T> {
-        // Avoid `Option::map` because it bloats LLVM IR.
-        match self.find(hash, eq) {
-            Some(bucket) => Some(unsafe { bucket.as_ref() }),
-            None => None,
-        }
-    }
-
-    /// Gets a mutable reference to an element in the table.
-    #[inline]
-    pub fn get_mut(&mut self, hash: u64, eq: impl FnMut(&T) -> bool) -> Option<&mut T> {
-        // Avoid `Option::map` because it bloats LLVM IR.
-        match self.find(hash, eq) {
-            Some(bucket) => Some(unsafe { bucket.as_mut() }),
-            None => None,
-        }
-    }
-
-    /// Attempts to get mutable references to `N` entries in the table at once.
-    ///
-    /// Returns an array of length `N` with the results of each query.
-    ///
-    /// At most one mutable reference will be returned to any entry. `None` will be returned if any
-    /// of the hashes are duplicates. `None` will be returned if the hash is not found.
-    ///
-    /// The `eq` argument should be a closure such that `eq(i, k)` returns true if `k` is equal to
-    /// the `i`th key to be looked up.
-    pub fn get_many_mut<const N: usize>(
-        &mut self,
-        hashes: [u64; N],
-        eq: impl FnMut(usize, &T) -> bool,
-    ) -> Option<[&'_ mut T; N]> {
-        unsafe {
-            let ptrs = self.get_many_mut_pointers(hashes, eq)?;
-
-            for (i, &cur) in ptrs.iter().enumerate() {
-                if ptrs[..i].iter().any(|&prev| ptr::eq::<T>(prev, cur)) {
-                    return None;
-                }
-            }
-            // All bucket are distinct from all previous buckets so we're clear to return the result
-            // of the lookup.
-
-            // TODO use `MaybeUninit::array_assume_init` here instead once that's stable.
-            Some(mem::transmute_copy(&ptrs))
-        }
-    }
-
-    pub unsafe fn get_many_unchecked_mut<const N: usize>(
-        &mut self,
-        hashes: [u64; N],
-        eq: impl FnMut(usize, &T) -> bool,
-    ) -> Option<[&'_ mut T; N]> {
-        let ptrs = self.get_many_mut_pointers(hashes, eq)?;
-        Some(mem::transmute_copy(&ptrs))
-    }
-
-    unsafe fn get_many_mut_pointers<const N: usize>(
-        &mut self,
-        hashes: [u64; N],
-        mut eq: impl FnMut(usize, &T) -> bool,
-    ) -> Option<[*mut T; N]> {
-        // TODO use `MaybeUninit::uninit_array` here instead once that's stable.
-        let mut outs: MaybeUninit<[*mut T; N]> = MaybeUninit::uninit();
-        let outs_ptr = outs.as_mut_ptr();
-
-        for (i, &hash) in hashes.iter().enumerate() {
-            let cur = self.find(hash, |k| eq(i, k))?;
-            *(*outs_ptr).get_unchecked_mut(i) = cur.as_mut();
-        }
-
-        // TODO use `MaybeUninit::array_assume_init` here instead once that's stable.
-        Some(outs.assume_init())
-    }
-
-    /// Returns the number of elements the map can hold without reallocating.
-    ///
-    /// This number is a lower bound; the table might be able to hold
-    /// more, but is guaranteed to be able to hold at least this many.
-    #[inline]
-    pub fn capacity(&self) -> usize {
-        self.table.items + self.table.growth_left
-    }
-
-    /// Returns the number of elements in the table.
-    #[inline]
-    pub fn len(&self) -> usize {
-        self.table.items
-    }
-
-    /// Returns `true` if the table contains no elements.
-    #[inline]
-    pub fn is_empty(&self) -> bool {
-        self.len() == 0
-    }
-
-    /// Returns the number of buckets in the table.
-    #[inline]
-    pub fn buckets(&self) -> usize {
-        self.table.bucket_mask + 1
-    }
-
-    /// Returns an iterator over every element in the table. It is up to
-    /// the caller to ensure that the `RawTable` outlives the `RawIter`.
-    /// Because we cannot make the `next` method unsafe on the `RawIter`
-    /// struct, we have to make the `iter` method unsafe.
-    #[inline]
-    pub unsafe fn iter(&self) -> RawIter<T> {
-        let data = Bucket::from_base_index(self.data_end(), 0);
-        RawIter {
-            iter: RawIterRange::new(self.table.ctrl.as_ptr(), data, self.table.buckets()),
-            items: self.table.items,
-        }
-    }
-
-    /// Returns an iterator over occupied buckets that could match a given hash.
-    ///
-    /// `RawTable` only stores 7 bits of the hash value, so this iterator may
-    /// return items that have a hash value different than the one provided. You
-    /// should always validate the returned values before using them.
-    ///
-    /// It is up to the caller to ensure that the `RawTable` outlives the
-    /// `RawIterHash`. Because we cannot make the `next` method unsafe on the
-    /// `RawIterHash` struct, we have to make the `iter_hash` method unsafe.
-    #[cfg_attr(feature = "inline-more", inline)]
-    #[cfg(feature = "raw")]
-    pub unsafe fn iter_hash(&self, hash: u64) -> RawIterHash<'_, T, A> {
-        RawIterHash::new(self, hash)
-    }
-
-    /// Returns an iterator which removes all elements from the table without
-    /// freeing the memory.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn drain(&mut self) -> RawDrain<'_, T, A> {
-        unsafe {
-            let iter = self.iter();
-            self.drain_iter_from(iter)
-        }
-    }
-
-    /// Returns an iterator which removes all elements from the table without
-    /// freeing the memory.
-    ///
-    /// Iteration starts at the provided iterator's current location.
-    ///
-    /// It is up to the caller to ensure that the iterator is valid for this
-    /// `RawTable` and covers all items that remain in the table.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub unsafe fn drain_iter_from(&mut self, iter: RawIter<T>) -> RawDrain<'_, T, A> {
-        debug_assert_eq!(iter.len(), self.len());
-        RawDrain {
-            iter,
-            table: ManuallyDrop::new(mem::replace(self, Self::new_in(self.table.alloc.clone()))),
-            orig_table: NonNull::from(self),
-            marker: PhantomData,
-        }
-    }
-
-    /// Returns an iterator which consumes all elements from the table.
-    ///
-    /// Iteration starts at the provided iterator's current location.
-    ///
-    /// It is up to the caller to ensure that the iterator is valid for this
-    /// `RawTable` and covers all items that remain in the table.
-    pub unsafe fn into_iter_from(self, iter: RawIter<T>) -> RawIntoIter<T, A> {
-        debug_assert_eq!(iter.len(), self.len());
-
-        let alloc = self.table.alloc.clone();
-        let allocation = self.into_allocation();
-        RawIntoIter {
-            iter,
-            allocation,
-            marker: PhantomData,
-            alloc,
-        }
-    }
-
-    /// Converts the table into a raw allocation. The contents of the table
-    /// should be dropped using a `RawIter` before freeing the allocation.
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub(crate) fn into_allocation(self) -> Option<(NonNull<u8>, Layout)> {
-        let alloc = if self.table.is_empty_singleton() {
-            None
-        } else {
-            // Avoid `Option::unwrap_or_else` because it bloats LLVM IR.
-            let (layout, ctrl_offset) = match calculate_layout::<T>(self.table.buckets()) {
-                Some(lco) => lco,
-                None => unsafe { hint::unreachable_unchecked() },
-            };
-            Some((
-                unsafe { NonNull::new_unchecked(self.table.ctrl.as_ptr().sub(ctrl_offset)) },
-                layout,
-            ))
-        };
-        mem::forget(self);
-        alloc
-    }
-}
-
-unsafe impl<T, A: Allocator + Clone> Send for RawTable<T, A>
-where
-    T: Send,
-    A: Send,
-{
-}
-unsafe impl<T, A: Allocator + Clone> Sync for RawTable<T, A>
-where
-    T: Sync,
-    A: Sync,
-{
-}
-
-impl<A> RawTableInner<A> {
-    #[inline]
-    const fn new_in(alloc: A) -> Self {
-        Self {
-            // Be careful to cast the entire slice to a raw pointer.
-            ctrl: unsafe { NonNull::new_unchecked(Group::static_empty() as *const _ as *mut u8) },
-            bucket_mask: 0,
-            items: 0,
-            growth_left: 0,
-            alloc,
-        }
-    }
-}
-
-impl<A: Allocator + Clone> RawTableInner<A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    unsafe fn new_uninitialized(
-        alloc: A,
-        table_layout: TableLayout,
-        buckets: usize,
-        fallibility: Fallibility,
-    ) -> Result<Self, TryReserveError> {
-        debug_assert!(buckets.is_power_of_two());
-
-        // Avoid `Option::ok_or_else` because it bloats LLVM IR.
-        let (layout, ctrl_offset) = match table_layout.calculate_layout_for(buckets) {
-            Some(lco) => lco,
-            None => return Err(fallibility.capacity_overflow()),
-        };
-
-        // We need an additional check to ensure that the allocation doesn't
-        // exceed `isize::MAX`. We can skip this check on 64-bit systems since
-        // such allocations will never succeed anyways.
-        //
-        // This mirrors what Vec does in the standard library.
-        if mem::size_of::<usize>() < 8 && layout.size() > isize::MAX as usize {
-            return Err(fallibility.capacity_overflow());
-        }
-
-        let ptr: NonNull<u8> = match do_alloc(&alloc, layout) {
-            Ok(block) => block.cast(),
-            Err(_) => return Err(fallibility.alloc_err(layout)),
-        };
-
-        let ctrl = NonNull::new_unchecked(ptr.as_ptr().add(ctrl_offset));
-        Ok(Self {
-            ctrl,
-            bucket_mask: buckets - 1,
-            items: 0,
-            growth_left: bucket_mask_to_capacity(buckets - 1),
-            alloc,
-        })
-    }
-
-    #[inline]
-    fn fallible_with_capacity(
-        alloc: A,
-        table_layout: TableLayout,
-        capacity: usize,
-        fallibility: Fallibility,
-    ) -> Result<Self, TryReserveError> {
-        if capacity == 0 {
-            Ok(Self::new_in(alloc))
-        } else {
-            unsafe {
-                let buckets =
-                    capacity_to_buckets(capacity).ok_or_else(|| fallibility.capacity_overflow())?;
-
-                let result = Self::new_uninitialized(alloc, table_layout, buckets, fallibility)?;
-                result.ctrl(0).write_bytes(EMPTY, result.num_ctrl_bytes());
-
-                Ok(result)
-            }
-        }
-    }
-
-    /// Searches for an empty or deleted bucket which is suitable for inserting
-    /// a new element and sets the hash for that slot.
-    ///
-    /// There must be at least 1 empty bucket in the table.
-    #[inline]
-    unsafe fn prepare_insert_slot(&self, hash: u64) -> (usize, u8) {
-        let index = self.find_insert_slot(hash);
-        let old_ctrl = *self.ctrl(index);
-        self.set_ctrl_h2(index, hash);
-        (index, old_ctrl)
-    }
-
-    /// Searches for an empty or deleted bucket which is suitable for inserting
-    /// a new element.
-    ///
-    /// There must be at least 1 empty bucket in the table.
-    #[inline]
-    fn find_insert_slot(&self, hash: u64) -> usize {
-        let mut probe_seq = self.probe_seq(hash);
-        loop {
-            unsafe {
-                let group = Group::load(self.ctrl(probe_seq.pos));
-                if let Some(bit) = group.match_empty_or_deleted().lowest_set_bit() {
-                    let result = (probe_seq.pos + bit) & self.bucket_mask;
-
-                    // In tables smaller than the group width, trailing control
-                    // bytes outside the range of the table are filled with
-                    // EMPTY entries. These will unfortunately trigger a
-                    // match, but once masked may point to a full bucket that
-                    // is already occupied. We detect this situation here and
-                    // perform a second scan starting at the beginning of the
-                    // table. This second scan is guaranteed to find an empty
-                    // slot (due to the load factor) before hitting the trailing
-                    // control bytes (containing EMPTY).
-                    if unlikely(is_full(*self.ctrl(result))) {
-                        debug_assert!(self.bucket_mask < Group::WIDTH);
-                        debug_assert_ne!(probe_seq.pos, 0);
-                        return Group::load_aligned(self.ctrl(0))
-                            .match_empty_or_deleted()
-                            .lowest_set_bit_nonzero();
-                    }
-
-                    return result;
-                }
-            }
-            probe_seq.move_next(self.bucket_mask);
-        }
-    }
-
-    /// Searches for an element in the table. This uses dynamic dispatch to reduce the amount of
-    /// code generated, but it is eliminated by LLVM optimizations.
-    #[inline]
-    fn find_inner(&self, hash: u64, eq: &mut dyn FnMut(usize) -> bool) -> Option<usize> {
-        let h2_hash = h2(hash);
-        let mut probe_seq = self.probe_seq(hash);
-
-        loop {
-            let group = unsafe { Group::load(self.ctrl(probe_seq.pos)) };
-
-            for bit in group.match_byte(h2_hash) {
-                let index = (probe_seq.pos + bit) & self.bucket_mask;
-
-                if likely(eq(index)) {
-                    return Some(index);
-                }
-            }
-
-            if likely(group.match_empty().any_bit_set()) {
-                return None;
-            }
-
-            probe_seq.move_next(self.bucket_mask);
-        }
-    }
-
-    #[allow(clippy::mut_mut)]
-    #[inline]
-    unsafe fn prepare_rehash_in_place(&mut self) {
-        // Bulk convert all full control bytes to DELETED, and all DELETED
-        // control bytes to EMPTY. This effectively frees up all buckets
-        // containing a DELETED entry.
-        for i in (0..self.buckets()).step_by(Group::WIDTH) {
-            let group = Group::load_aligned(self.ctrl(i));
-            let group = group.convert_special_to_empty_and_full_to_deleted();
-            group.store_aligned(self.ctrl(i));
-        }
-
-        // Fix up the trailing control bytes. See the comments in set_ctrl
-        // for the handling of tables smaller than the group width.
-        if self.buckets() < Group::WIDTH {
-            self.ctrl(0)
-                .copy_to(self.ctrl(Group::WIDTH), self.buckets());
-        } else {
-            self.ctrl(0)
-                .copy_to(self.ctrl(self.buckets()), Group::WIDTH);
-        }
-    }
-
-    #[inline]
-    unsafe fn bucket<T>(&self, index: usize) -> Bucket<T> {
-        debug_assert_ne!(self.bucket_mask, 0);
-        debug_assert!(index < self.buckets());
-        Bucket::from_base_index(self.data_end(), index)
-    }
-
-    #[inline]
-    unsafe fn bucket_ptr(&self, index: usize, size_of: usize) -> *mut u8 {
-        debug_assert_ne!(self.bucket_mask, 0);
-        debug_assert!(index < self.buckets());
-        let base: *mut u8 = self.data_end().as_ptr();
-        base.sub((index + 1) * size_of)
-    }
-
-    #[inline]
-    unsafe fn data_end<T>(&self) -> NonNull<T> {
-        NonNull::new_unchecked(self.ctrl.as_ptr().cast())
-    }
-
-    /// Returns an iterator-like object for a probe sequence on the table.
-    ///
-    /// This iterator never terminates, but is guaranteed to visit each bucket
-    /// group exactly once. The loop using `probe_seq` must terminate upon
-    /// reaching a group containing an empty bucket.
-    #[inline]
-    fn probe_seq(&self, hash: u64) -> ProbeSeq {
-        ProbeSeq {
-            pos: h1(hash) & self.bucket_mask,
-            stride: 0,
-        }
-    }
-
-    /// Returns the index of a bucket for which a value must be inserted if there is enough rooom
-    /// in the table, otherwise returns error
-    #[cfg(feature = "raw")]
-    #[inline]
-    unsafe fn prepare_insert_no_grow(&mut self, hash: u64) -> Result<usize, ()> {
-        let index = self.find_insert_slot(hash);
-        let old_ctrl = *self.ctrl(index);
-        if unlikely(self.growth_left == 0 && special_is_empty(old_ctrl)) {
-            Err(())
-        } else {
-            self.record_item_insert_at(index, old_ctrl, hash);
-            Ok(index)
-        }
-    }
-
-    #[inline]
-    unsafe fn record_item_insert_at(&mut self, index: usize, old_ctrl: u8, hash: u64) {
-        self.growth_left -= usize::from(special_is_empty(old_ctrl));
-        self.set_ctrl_h2(index, hash);
-        self.items += 1;
-    }
-
-    #[inline]
-    fn is_in_same_group(&self, i: usize, new_i: usize, hash: u64) -> bool {
-        let probe_seq_pos = self.probe_seq(hash).pos;
-        let probe_index =
-            |pos: usize| (pos.wrapping_sub(probe_seq_pos) & self.bucket_mask) / Group::WIDTH;
-        probe_index(i) == probe_index(new_i)
-    }
-
-    /// Sets a control byte to the hash, and possibly also the replicated control byte at
-    /// the end of the array.
-    #[inline]
-    unsafe fn set_ctrl_h2(&self, index: usize, hash: u64) {
-        self.set_ctrl(index, h2(hash));
-    }
-
-    #[inline]
-    unsafe fn replace_ctrl_h2(&self, index: usize, hash: u64) -> u8 {
-        let prev_ctrl = *self.ctrl(index);
-        self.set_ctrl_h2(index, hash);
-        prev_ctrl
-    }
-
-    /// Sets a control byte, and possibly also the replicated control byte at
-    /// the end of the array.
-    #[inline]
-    unsafe fn set_ctrl(&self, index: usize, ctrl: u8) {
-        // Replicate the first Group::WIDTH control bytes at the end of
-        // the array without using a branch:
-        // - If index >= Group::WIDTH then index == index2.
-        // - Otherwise index2 == self.bucket_mask + 1 + index.
-        //
-        // The very last replicated control byte is never actually read because
-        // we mask the initial index for unaligned loads, but we write it
-        // anyways because it makes the set_ctrl implementation simpler.
-        //
-        // If there are fewer buckets than Group::WIDTH then this code will
-        // replicate the buckets at the end of the trailing group. For example
-        // with 2 buckets and a group size of 4, the control bytes will look
-        // like this:
-        //
-        //     Real    |             Replicated
-        // ---------------------------------------------
-        // | [A] | [B] | [EMPTY] | [EMPTY] | [A] | [B] |
-        // ---------------------------------------------
-        let index2 = ((index.wrapping_sub(Group::WIDTH)) & self.bucket_mask) + Group::WIDTH;
-
-        *self.ctrl(index) = ctrl;
-        *self.ctrl(index2) = ctrl;
-    }
-
-    /// Returns a pointer to a control byte.
-    #[inline]
-    unsafe fn ctrl(&self, index: usize) -> *mut u8 {
-        debug_assert!(index < self.num_ctrl_bytes());
-        self.ctrl.as_ptr().add(index)
-    }
-
-    #[inline]
-    fn buckets(&self) -> usize {
-        self.bucket_mask + 1
-    }
-
-    #[inline]
-    fn num_ctrl_bytes(&self) -> usize {
-        self.bucket_mask + 1 + Group::WIDTH
-    }
-
-    #[inline]
-    fn is_empty_singleton(&self) -> bool {
-        self.bucket_mask == 0
-    }
-
-    #[allow(clippy::mut_mut)]
-    #[inline]
-    unsafe fn prepare_resize(
-        &self,
-        table_layout: TableLayout,
-        capacity: usize,
-        fallibility: Fallibility,
-    ) -> Result<crate::scopeguard::ScopeGuard<Self, impl FnMut(&mut Self)>, TryReserveError> {
-        debug_assert!(self.items <= capacity);
-
-        // Allocate and initialize the new table.
-        let mut new_table = RawTableInner::fallible_with_capacity(
-            self.alloc.clone(),
-            table_layout,
-            capacity,
-            fallibility,
-        )?;
-        new_table.growth_left -= self.items;
-        new_table.items = self.items;
-
-        // The hash function may panic, in which case we simply free the new
-        // table without dropping any elements that may have been copied into
-        // it.
-        //
-        // This guard is also used to free the old table on success, see
-        // the comment at the bottom of this function.
-        Ok(guard(new_table, move |self_| {
-            if !self_.is_empty_singleton() {
-                self_.free_buckets(table_layout);
-            }
-        }))
-    }
-
-    /// Reserves or rehashes to make room for `additional` more elements.
-    ///
-    /// This uses dynamic dispatch to reduce the amount of
-    /// code generated, but it is eliminated by LLVM optimizations when inlined.
-    #[allow(clippy::inline_always)]
-    #[inline(always)]
-    unsafe fn reserve_rehash_inner(
-        &mut self,
-        additional: usize,
-        hasher: &dyn Fn(&mut Self, usize) -> u64,
-        fallibility: Fallibility,
-        layout: TableLayout,
-        drop: Option<fn(*mut u8)>,
-    ) -> Result<(), TryReserveError> {
-        // Avoid `Option::ok_or_else` because it bloats LLVM IR.
-        let new_items = match self.items.checked_add(additional) {
-            Some(new_items) => new_items,
-            None => return Err(fallibility.capacity_overflow()),
-        };
-        let full_capacity = bucket_mask_to_capacity(self.bucket_mask);
-        if new_items <= full_capacity / 2 {
-            // Rehash in-place without re-allocating if we have plenty of spare
-            // capacity that is locked up due to DELETED entries.
-            self.rehash_in_place(hasher, layout.size, drop);
-            Ok(())
-        } else {
-            // Otherwise, conservatively resize to at least the next size up
-            // to avoid churning deletes into frequent rehashes.
-            self.resize_inner(
-                usize::max(new_items, full_capacity + 1),
-                hasher,
-                fallibility,
-                layout,
-            )
-        }
-    }
-
-    /// Allocates a new table of a different size and moves the contents of the
-    /// current table into it.
-    ///
-    /// This uses dynamic dispatch to reduce the amount of
-    /// code generated, but it is eliminated by LLVM optimizations when inlined.
-    #[allow(clippy::inline_always)]
-    #[inline(always)]
-    unsafe fn resize_inner(
-        &mut self,
-        capacity: usize,
-        hasher: &dyn Fn(&mut Self, usize) -> u64,
-        fallibility: Fallibility,
-        layout: TableLayout,
-    ) -> Result<(), TryReserveError> {
-        let mut new_table = self.prepare_resize(layout, capacity, fallibility)?;
-
-        // Copy all elements to the new table.
-        for i in 0..self.buckets() {
-            if !is_full(*self.ctrl(i)) {
-                continue;
-            }
-
-            // This may panic.
-            let hash = hasher(self, i);
-
-            // We can use a simpler version of insert() here since:
-            // - there are no DELETED entries.
-            // - we know there is enough space in the table.
-            // - all elements are unique.
-            let (index, _) = new_table.prepare_insert_slot(hash);
-
-            ptr::copy_nonoverlapping(
-                self.bucket_ptr(i, layout.size),
-                new_table.bucket_ptr(index, layout.size),
-                layout.size,
-            );
-        }
-
-        // We successfully copied all elements without panicking. Now replace
-        // self with the new table. The old table will have its memory freed but
-        // the items will not be dropped (since they have been moved into the
-        // new table).
-        mem::swap(self, &mut new_table);
-
-        Ok(())
-    }
-
-    /// Rehashes the contents of the table in place (i.e. without changing the
-    /// allocation).
-    ///
-    /// If `hasher` panics then some the table's contents may be lost.
-    ///
-    /// This uses dynamic dispatch to reduce the amount of
-    /// code generated, but it is eliminated by LLVM optimizations when inlined.
-    #[allow(clippy::inline_always)]
-    #[cfg_attr(feature = "inline-more", inline(always))]
-    #[cfg_attr(not(feature = "inline-more"), inline)]
-    unsafe fn rehash_in_place(
-        &mut self,
-        hasher: &dyn Fn(&mut Self, usize) -> u64,
-        size_of: usize,
-        drop: Option<fn(*mut u8)>,
-    ) {
-        // If the hash function panics then properly clean up any elements
-        // that we haven't rehashed yet. We unfortunately can't preserve the
-        // element since we lost their hash and have no way of recovering it
-        // without risking another panic.
-        self.prepare_rehash_in_place();
-
-        let mut guard = guard(self, move |self_| {
-            if let Some(drop) = drop {
-                for i in 0..self_.buckets() {
-                    if *self_.ctrl(i) == DELETED {
-                        self_.set_ctrl(i, EMPTY);
-                        drop(self_.bucket_ptr(i, size_of));
-                        self_.items -= 1;
-                    }
-                }
-            }
-            self_.growth_left = bucket_mask_to_capacity(self_.bucket_mask) - self_.items;
-        });
-
-        // At this point, DELETED elements are elements that we haven't
-        // rehashed yet. Find them and re-insert them at their ideal
-        // position.
-        'outer: for i in 0..guard.buckets() {
-            if *guard.ctrl(i) != DELETED {
-                continue;
-            }
-
-            let i_p = guard.bucket_ptr(i, size_of);
-
-            'inner: loop {
-                // Hash the current item
-                let hash = hasher(*guard, i);
-
-                // Search for a suitable place to put it
-                let new_i = guard.find_insert_slot(hash);
-                let new_i_p = guard.bucket_ptr(new_i, size_of);
-
-                // Probing works by scanning through all of the control
-                // bytes in groups, which may not be aligned to the group
-                // size. If both the new and old position fall within the
-                // same unaligned group, then there is no benefit in moving
-                // it and we can just continue to the next item.
-                if likely(guard.is_in_same_group(i, new_i, hash)) {
-                    guard.set_ctrl_h2(i, hash);
-                    continue 'outer;
-                }
-
-                // We are moving the current item to a new position. Write
-                // our H2 to the control byte of the new position.
-                let prev_ctrl = guard.replace_ctrl_h2(new_i, hash);
-                if prev_ctrl == EMPTY {
-                    guard.set_ctrl(i, EMPTY);
-                    // If the target slot is empty, simply move the current
-                    // element into the new slot and clear the old control
-                    // byte.
-                    ptr::copy_nonoverlapping(i_p, new_i_p, size_of);
-                    continue 'outer;
-                } else {
-                    // If the target slot is occupied, swap the two elements
-                    // and then continue processing the element that we just
-                    // swapped into the old slot.
-                    debug_assert_eq!(prev_ctrl, DELETED);
-                    ptr::swap_nonoverlapping(i_p, new_i_p, size_of);
-                    continue 'inner;
-                }
-            }
-        }
-
-        guard.growth_left = bucket_mask_to_capacity(guard.bucket_mask) - guard.items;
-
-        mem::forget(guard);
-    }
-
-    #[inline]
-    unsafe fn free_buckets(&mut self, table_layout: TableLayout) {
-        // Avoid `Option::unwrap_or_else` because it bloats LLVM IR.
-        let (layout, ctrl_offset) = match table_layout.calculate_layout_for(self.buckets()) {
-            Some(lco) => lco,
-            None => hint::unreachable_unchecked(),
-        };
-        self.alloc.deallocate(
-            NonNull::new_unchecked(self.ctrl.as_ptr().sub(ctrl_offset)),
-            layout,
-        );
-    }
-
-    /// Marks all table buckets as empty without dropping their contents.
-    #[inline]
-    fn clear_no_drop(&mut self) {
-        if !self.is_empty_singleton() {
-            unsafe {
-                self.ctrl(0).write_bytes(EMPTY, self.num_ctrl_bytes());
-            }
-        }
-        self.items = 0;
-        self.growth_left = bucket_mask_to_capacity(self.bucket_mask);
-    }
-
-    #[inline]
-    unsafe fn erase(&mut self, index: usize) {
-        debug_assert!(is_full(*self.ctrl(index)));
-        let index_before = index.wrapping_sub(Group::WIDTH) & self.bucket_mask;
-        let empty_before = Group::load(self.ctrl(index_before)).match_empty();
-        let empty_after = Group::load(self.ctrl(index)).match_empty();
-
-        // If we are inside a continuous block of Group::WIDTH full or deleted
-        // cells then a probe window may have seen a full block when trying to
-        // insert. We therefore need to keep that block non-empty so that
-        // lookups will continue searching to the next probe window.
-        //
-        // Note that in this context `leading_zeros` refers to the bytes at the
-        // end of a group, while `trailing_zeros` refers to the bytes at the
-        // beginning of a group.
-        let ctrl = if empty_before.leading_zeros() + empty_after.trailing_zeros() >= Group::WIDTH {
-            DELETED
-        } else {
-            self.growth_left += 1;
-            EMPTY
-        };
-        self.set_ctrl(index, ctrl);
-        self.items -= 1;
-    }
-}
-
-impl<T: Clone, A: Allocator + Clone> Clone for RawTable<T, A> {
-    fn clone(&self) -> Self {
-        if self.table.is_empty_singleton() {
-            Self::new_in(self.table.alloc.clone())
-        } else {
-            unsafe {
-                // Avoid `Result::ok_or_else` because it bloats LLVM IR.
-                let new_table = match Self::new_uninitialized(
-                    self.table.alloc.clone(),
-                    self.table.buckets(),
-                    Fallibility::Infallible,
-                ) {
-                    Ok(table) => table,
-                    Err(_) => hint::unreachable_unchecked(),
-                };
-
-                // If cloning fails then we need to free the allocation for the
-                // new table. However we don't run its drop since its control
-                // bytes are not initialized yet.
-                let mut guard = guard(ManuallyDrop::new(new_table), |new_table| {
-                    new_table.free_buckets();
-                });
-
-                guard.clone_from_spec(self);
-
-                // Disarm the scope guard and return the newly created table.
-                ManuallyDrop::into_inner(ScopeGuard::into_inner(guard))
-            }
-        }
-    }
-
-    fn clone_from(&mut self, source: &Self) {
-        if source.table.is_empty_singleton() {
-            *self = Self::new_in(self.table.alloc.clone());
-        } else {
-            unsafe {
-                // Make sure that if any panics occurs, we clear the table and
-                // leave it in an empty state.
-                let mut self_ = guard(self, |self_| {
-                    self_.clear_no_drop();
-                });
-
-                // First, drop all our elements without clearing the control
-                // bytes. If this panics then the scope guard will clear the
-                // table, leaking any elements that were not dropped yet.
-                //
-                // This leak is unavoidable: we can't try dropping more elements
-                // since this could lead to another panic and abort the process.
-                self_.drop_elements();
-
-                // If necessary, resize our table to match the source.
-                if self_.buckets() != source.buckets() {
-                    // Skip our drop by using ptr::write.
-                    if !self_.table.is_empty_singleton() {
-                        self_.free_buckets();
-                    }
-                    (&mut **self_ as *mut Self).write(
-                        // Avoid `Result::unwrap_or_else` because it bloats LLVM IR.
-                        match Self::new_uninitialized(
-                            self_.table.alloc.clone(),
-                            source.buckets(),
-                            Fallibility::Infallible,
-                        ) {
-                            Ok(table) => table,
-                            Err(_) => hint::unreachable_unchecked(),
-                        },
-                    );
-                }
-
-                self_.clone_from_spec(source);
-
-                // Disarm the scope guard if cloning was successful.
-                ScopeGuard::into_inner(self_);
-            }
-        }
-    }
-}
-
-/// Specialization of `clone_from` for `Copy` types
-trait RawTableClone {
-    unsafe fn clone_from_spec(&mut self, source: &Self);
-}
-impl<T: Clone, A: Allocator + Clone> RawTableClone for RawTable<T, A> {
-    default_fn! {
-        #[cfg_attr(feature = "inline-more", inline)]
-        unsafe fn clone_from_spec(&mut self, source: &Self) {
-            self.clone_from_impl(source);
-        }
-    }
-}
-#[cfg(feature = "nightly")]
-impl<T: Copy, A: Allocator + Clone> RawTableClone for RawTable<T, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    unsafe fn clone_from_spec(&mut self, source: &Self) {
-        source
-            .table
-            .ctrl(0)
-            .copy_to_nonoverlapping(self.table.ctrl(0), self.table.num_ctrl_bytes());
-        source
-            .data_start()
-            .copy_to_nonoverlapping(self.data_start(), self.table.buckets());
-
-        self.table.items = source.table.items;
-        self.table.growth_left = source.table.growth_left;
-    }
-}
-
-impl<T: Clone, A: Allocator + Clone> RawTable<T, A> {
-    /// Common code for clone and clone_from. Assumes:
-    /// - `self.buckets() == source.buckets()`.
-    /// - Any existing elements have been dropped.
-    /// - The control bytes are not initialized yet.
-    #[cfg_attr(feature = "inline-more", inline)]
-    unsafe fn clone_from_impl(&mut self, source: &Self) {
-        // Copy the control bytes unchanged. We do this in a single pass
-        source
-            .table
-            .ctrl(0)
-            .copy_to_nonoverlapping(self.table.ctrl(0), self.table.num_ctrl_bytes());
-
-        // The cloning of elements may panic, in which case we need
-        // to make sure we drop only the elements that have been
-        // cloned so far.
-        let mut guard = guard((0, &mut *self), |(index, self_)| {
-            if mem::needs_drop::<T>() && !self_.is_empty() {
-                for i in 0..=*index {
-                    if is_full(*self_.table.ctrl(i)) {
-                        self_.bucket(i).drop();
-                    }
-                }
-            }
-        });
-
-        for from in source.iter() {
-            let index = source.bucket_index(&from);
-            let to = guard.1.bucket(index);
-            to.write(from.as_ref().clone());
-
-            // Update the index in case we need to unwind.
-            guard.0 = index;
-        }
-
-        // Successfully cloned all items, no need to clean up.
-        mem::forget(guard);
-
-        self.table.items = source.table.items;
-        self.table.growth_left = source.table.growth_left;
-    }
-
-    /// Variant of `clone_from` to use when a hasher is available.
-    #[cfg(feature = "raw")]
-    pub fn clone_from_with_hasher(&mut self, source: &Self, hasher: impl Fn(&T) -> u64) {
-        // If we have enough capacity in the table, just clear it and insert
-        // elements one by one. We don't do this if we have the same number of
-        // buckets as the source since we can just copy the contents directly
-        // in that case.
-        if self.table.buckets() != source.table.buckets()
-            && bucket_mask_to_capacity(self.table.bucket_mask) >= source.len()
-        {
-            self.clear();
-
-            let guard_self = guard(&mut *self, |self_| {
-                // Clear the partially copied table if a panic occurs, otherwise
-                // items and growth_left will be out of sync with the contents
-                // of the table.
-                self_.clear();
-            });
-
-            unsafe {
-                for item in source.iter() {
-                    // This may panic.
-                    let item = item.as_ref().clone();
-                    let hash = hasher(&item);
-
-                    // We can use a simpler version of insert() here since:
-                    // - there are no DELETED entries.
-                    // - we know there is enough space in the table.
-                    // - all elements are unique.
-                    let (index, _) = guard_self.table.prepare_insert_slot(hash);
-                    guard_self.bucket(index).write(item);
-                }
-            }
-
-            // Successfully cloned all items, no need to clean up.
-            mem::forget(guard_self);
-
-            self.table.items = source.table.items;
-            self.table.growth_left -= source.table.items;
-        } else {
-            self.clone_from(source);
-        }
-    }
-}
-
-impl<T, A: Allocator + Clone + Default> Default for RawTable<T, A> {
-    #[inline]
-    fn default() -> Self {
-        Self::new_in(Default::default())
-    }
-}
-
-#[cfg(feature = "nightly")]
-unsafe impl<#[may_dangle] T, A: Allocator + Clone> Drop for RawTable<T, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn drop(&mut self) {
-        if !self.table.is_empty_singleton() {
-            unsafe {
-                self.drop_elements();
-                self.free_buckets();
-            }
-        }
-    }
-}
-#[cfg(not(feature = "nightly"))]
-impl<T, A: Allocator + Clone> Drop for RawTable<T, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn drop(&mut self) {
-        if !self.table.is_empty_singleton() {
-            unsafe {
-                self.drop_elements();
-                self.free_buckets();
-            }
-        }
-    }
-}
-
-impl<T, A: Allocator + Clone> IntoIterator for RawTable<T, A> {
-    type Item = T;
-    type IntoIter = RawIntoIter<T, A>;
-
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn into_iter(self) -> RawIntoIter<T, A> {
-        unsafe {
-            let iter = self.iter();
-            self.into_iter_from(iter)
-        }
-    }
-}
-
-/// Iterator over a sub-range of a table. Unlike `RawIter` this iterator does
-/// not track an item count.
-pub(crate) struct RawIterRange<T> {
-    // Mask of full buckets in the current group. Bits are cleared from this
-    // mask as each element is processed.
-    current_group: BitMask,
-
-    // Pointer to the buckets for the current group.
-    data: Bucket<T>,
-
-    // Pointer to the next group of control bytes,
-    // Must be aligned to the group size.
-    next_ctrl: *const u8,
-
-    // Pointer one past the last control byte of this range.
-    end: *const u8,
-}
-
-impl<T> RawIterRange<T> {
-    /// Returns a `RawIterRange` covering a subset of a table.
-    ///
-    /// The control byte address must be aligned to the group size.
-    #[cfg_attr(feature = "inline-more", inline)]
-    unsafe fn new(ctrl: *const u8, data: Bucket<T>, len: usize) -> Self {
-        debug_assert_ne!(len, 0);
-        debug_assert_eq!(ctrl as usize % Group::WIDTH, 0);
-        let end = ctrl.add(len);
-
-        // Load the first group and advance ctrl to point to the next group
-        let current_group = Group::load_aligned(ctrl).match_full();
-        let next_ctrl = ctrl.add(Group::WIDTH);
-
-        Self {
-            current_group,
-            data,
-            next_ctrl,
-            end,
-        }
-    }
-
-    /// Splits a `RawIterRange` into two halves.
-    ///
-    /// Returns `None` if the remaining range is smaller than or equal to the
-    /// group width.
-    #[cfg_attr(feature = "inline-more", inline)]
-    #[cfg(feature = "rayon")]
-    pub(crate) fn split(mut self) -> (Self, Option<RawIterRange<T>>) {
-        unsafe {
-            if self.end <= self.next_ctrl {
-                // Nothing to split if the group that we are current processing
-                // is the last one.
-                (self, None)
-            } else {
-                // len is the remaining number of elements after the group that
-                // we are currently processing. It must be a multiple of the
-                // group size (small tables are caught by the check above).
-                let len = offset_from(self.end, self.next_ctrl);
-                debug_assert_eq!(len % Group::WIDTH, 0);
-
-                // Split the remaining elements into two halves, but round the
-                // midpoint down in case there is an odd number of groups
-                // remaining. This ensures that:
-                // - The tail is at least 1 group long.
-                // - The split is roughly even considering we still have the
-                //   current group to process.
-                let mid = (len / 2) & !(Group::WIDTH - 1);
-
-                let tail = Self::new(
-                    self.next_ctrl.add(mid),
-                    self.data.next_n(Group::WIDTH).next_n(mid),
-                    len - mid,
-                );
-                debug_assert_eq!(
-                    self.data.next_n(Group::WIDTH).next_n(mid).ptr,
-                    tail.data.ptr
-                );
-                debug_assert_eq!(self.end, tail.end);
-                self.end = self.next_ctrl.add(mid);
-                debug_assert_eq!(self.end.add(Group::WIDTH), tail.next_ctrl);
-                (self, Some(tail))
-            }
-        }
-    }
-
-    /// # Safety
-    /// If DO_CHECK_PTR_RANGE is false, caller must ensure that we never try to iterate
-    /// after yielding all elements.
-    #[cfg_attr(feature = "inline-more", inline)]
-    unsafe fn next_impl<const DO_CHECK_PTR_RANGE: bool>(&mut self) -> Option<Bucket<T>> {
-        loop {
-            if let Some(index) = self.current_group.lowest_set_bit() {
-                self.current_group = self.current_group.remove_lowest_bit();
-                return Some(self.data.next_n(index));
-            }
-
-            if DO_CHECK_PTR_RANGE && self.next_ctrl >= self.end {
-                return None;
-            }
-
-            // We might read past self.end up to the next group boundary,
-            // but this is fine because it only occurs on tables smaller
-            // than the group size where the trailing control bytes are all
-            // EMPTY. On larger tables self.end is guaranteed to be aligned
-            // to the group size (since tables are power-of-two sized).
-            self.current_group = Group::load_aligned(self.next_ctrl).match_full();
-            self.data = self.data.next_n(Group::WIDTH);
-            self.next_ctrl = self.next_ctrl.add(Group::WIDTH);
-        }
-    }
-}
-
-// We make raw iterators unconditionally Send and Sync, and let the PhantomData
-// in the actual iterator implementations determine the real Send/Sync bounds.
-unsafe impl<T> Send for RawIterRange<T> {}
-unsafe impl<T> Sync for RawIterRange<T> {}
-
-impl<T> Clone for RawIterRange<T> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn clone(&self) -> Self {
-        Self {
-            data: self.data.clone(),
-            next_ctrl: self.next_ctrl,
-            current_group: self.current_group,
-            end: self.end,
-        }
-    }
-}
-
-impl<T> Iterator for RawIterRange<T> {
-    type Item = Bucket<T>;
-
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn next(&mut self) -> Option<Bucket<T>> {
-        unsafe {
-            // SAFETY: We set checker flag to true.
-            self.next_impl::<true>()
-        }
-    }
-
-    #[inline]
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        // We don't have an item count, so just guess based on the range size.
-        let remaining_buckets = if self.end > self.next_ctrl {
-            unsafe { offset_from(self.end, self.next_ctrl) }
-        } else {
-            0
-        };
-
-        // Add a group width to include the group we are currently processing.
-        (0, Some(Group::WIDTH + remaining_buckets))
-    }
-}
-
-impl<T> FusedIterator for RawIterRange<T> {}
-
-/// Iterator which returns a raw pointer to every full bucket in the table.
-///
-/// For maximum flexibility this iterator is not bound by a lifetime, but you
-/// must observe several rules when using it:
-/// - You must not free the hash table while iterating (including via growing/shrinking).
-/// - It is fine to erase a bucket that has been yielded by the iterator.
-/// - Erasing a bucket that has not yet been yielded by the iterator may still
-///   result in the iterator yielding that bucket (unless `reflect_remove` is called).
-/// - It is unspecified whether an element inserted after the iterator was
-///   created will be yielded by that iterator (unless `reflect_insert` is called).
-/// - The order in which the iterator yields bucket is unspecified and may
-///   change in the future.
-pub struct RawIter<T> {
-    pub(crate) iter: RawIterRange<T>,
-    items: usize,
-}
-
-impl<T> RawIter<T> {
-    /// Refresh the iterator so that it reflects a removal from the given bucket.
-    ///
-    /// For the iterator to remain valid, this method must be called once
-    /// for each removed bucket before `next` is called again.
-    ///
-    /// This method should be called _before_ the removal is made. It is not necessary to call this
-    /// method if you are removing an item that this iterator yielded in the past.
-    #[cfg(feature = "raw")]
-    pub fn reflect_remove(&mut self, b: &Bucket<T>) {
-        self.reflect_toggle_full(b, false);
-    }
-
-    /// Refresh the iterator so that it reflects an insertion into the given bucket.
-    ///
-    /// For the iterator to remain valid, this method must be called once
-    /// for each insert before `next` is called again.
-    ///
-    /// This method does not guarantee that an insertion of a bucket with a greater
-    /// index than the last one yielded will be reflected in the iterator.
-    ///
-    /// This method should be called _after_ the given insert is made.
-    #[cfg(feature = "raw")]
-    pub fn reflect_insert(&mut self, b: &Bucket<T>) {
-        self.reflect_toggle_full(b, true);
-    }
-
-    /// Refresh the iterator so that it reflects a change to the state of the given bucket.
-    #[cfg(feature = "raw")]
-    fn reflect_toggle_full(&mut self, b: &Bucket<T>, is_insert: bool) {
-        unsafe {
-            if b.as_ptr() > self.iter.data.as_ptr() {
-                // The iterator has already passed the bucket's group.
-                // So the toggle isn't relevant to this iterator.
-                return;
-            }
-
-            if self.iter.next_ctrl < self.iter.end
-                && b.as_ptr() <= self.iter.data.next_n(Group::WIDTH).as_ptr()
-            {
-                // The iterator has not yet reached the bucket's group.
-                // We don't need to reload anything, but we do need to adjust the item count.
-
-                if cfg!(debug_assertions) {
-                    // Double-check that the user isn't lying to us by checking the bucket state.
-                    // To do that, we need to find its control byte. We know that self.iter.data is
-                    // at self.iter.next_ctrl - Group::WIDTH, so we work from there:
-                    let offset = offset_from(self.iter.data.as_ptr(), b.as_ptr());
-                    let ctrl = self.iter.next_ctrl.sub(Group::WIDTH).add(offset);
-                    // This method should be called _before_ a removal, or _after_ an insert,
-                    // so in both cases the ctrl byte should indicate that the bucket is full.
-                    assert!(is_full(*ctrl));
-                }
-
-                if is_insert {
-                    self.items += 1;
-                } else {
-                    self.items -= 1;
-                }
-
-                return;
-            }
-
-            // The iterator is at the bucket group that the toggled bucket is in.
-            // We need to do two things:
-            //
-            //  - Determine if the iterator already yielded the toggled bucket.
-            //    If it did, we're done.
-            //  - Otherwise, update the iterator cached group so that it won't
-            //    yield a to-be-removed bucket, or _will_ yield a to-be-added bucket.
-            //    We'll also need to update the item count accordingly.
-            if let Some(index) = self.iter.current_group.lowest_set_bit() {
-                let next_bucket = self.iter.data.next_n(index);
-                if b.as_ptr() > next_bucket.as_ptr() {
-                    // The toggled bucket is "before" the bucket the iterator would yield next. We
-                    // therefore don't need to do anything --- the iterator has already passed the
-                    // bucket in question.
-                    //
-                    // The item count must already be correct, since a removal or insert "prior" to
-                    // the iterator's position wouldn't affect the item count.
-                } else {
-                    // The removed bucket is an upcoming bucket. We need to make sure it does _not_
-                    // get yielded, and also that it's no longer included in the item count.
-                    //
-                    // NOTE: We can't just reload the group here, both since that might reflect
-                    // inserts we've already passed, and because that might inadvertently unset the
-                    // bits for _other_ removals. If we do that, we'd have to also decrement the
-                    // item count for those other bits that we unset. But the presumably subsequent
-                    // call to reflect for those buckets might _also_ decrement the item count.
-                    // Instead, we _just_ flip the bit for the particular bucket the caller asked
-                    // us to reflect.
-                    let our_bit = offset_from(self.iter.data.as_ptr(), b.as_ptr());
-                    let was_full = self.iter.current_group.flip(our_bit);
-                    debug_assert_ne!(was_full, is_insert);
-
-                    if is_insert {
-                        self.items += 1;
-                    } else {
-                        self.items -= 1;
-                    }
-
-                    if cfg!(debug_assertions) {
-                        if b.as_ptr() == next_bucket.as_ptr() {
-                            // The removed bucket should no longer be next
-                            debug_assert_ne!(self.iter.current_group.lowest_set_bit(), Some(index));
-                        } else {
-                            // We should not have changed what bucket comes next.
-                            debug_assert_eq!(self.iter.current_group.lowest_set_bit(), Some(index));
-                        }
-                    }
-                }
-            } else {
-                // We must have already iterated past the removed item.
-            }
-        }
-    }
-
-    unsafe fn drop_elements(&mut self) {
-        if mem::needs_drop::<T>() && self.len() != 0 {
-            for item in self {
-                item.drop();
-            }
-        }
-    }
-}
-
-impl<T> Clone for RawIter<T> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn clone(&self) -> Self {
-        Self {
-            iter: self.iter.clone(),
-            items: self.items,
-        }
-    }
-}
-
-impl<T> Iterator for RawIter<T> {
-    type Item = Bucket<T>;
-
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn next(&mut self) -> Option<Bucket<T>> {
-        // Inner iterator iterates over buckets
-        // so it can do unnecessary work if we already yielded all items.
-        if self.items == 0 {
-            return None;
-        }
-
-        let nxt = unsafe {
-            // SAFETY: We check number of items to yield using `items` field.
-            self.iter.next_impl::<false>()
-        };
-
-        if nxt.is_some() {
-            self.items -= 1;
-        }
-
-        nxt
-    }
-
-    #[inline]
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        (self.items, Some(self.items))
-    }
-}
-
-impl<T> ExactSizeIterator for RawIter<T> {}
-impl<T> FusedIterator for RawIter<T> {}
-
-/// Iterator which consumes a table and returns elements.
-pub struct RawIntoIter<T, A: Allocator + Clone = Global> {
-    iter: RawIter<T>,
-    allocation: Option<(NonNull<u8>, Layout)>,
-    marker: PhantomData<T>,
-    alloc: A,
-}
-
-impl<T, A: Allocator + Clone> RawIntoIter<T, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn iter(&self) -> RawIter<T> {
-        self.iter.clone()
-    }
-}
-
-unsafe impl<T, A: Allocator + Clone> Send for RawIntoIter<T, A>
-where
-    T: Send,
-    A: Send,
-{
-}
-unsafe impl<T, A: Allocator + Clone> Sync for RawIntoIter<T, A>
-where
-    T: Sync,
-    A: Sync,
-{
-}
-
-#[cfg(feature = "nightly")]
-unsafe impl<#[may_dangle] T, A: Allocator + Clone> Drop for RawIntoIter<T, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn drop(&mut self) {
-        unsafe {
-            // Drop all remaining elements
-            self.iter.drop_elements();
-
-            // Free the table
-            if let Some((ptr, layout)) = self.allocation {
-                self.alloc.deallocate(ptr, layout);
-            }
-        }
-    }
-}
-#[cfg(not(feature = "nightly"))]
-impl<T, A: Allocator + Clone> Drop for RawIntoIter<T, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn drop(&mut self) {
-        unsafe {
-            // Drop all remaining elements
-            self.iter.drop_elements();
-
-            // Free the table
-            if let Some((ptr, layout)) = self.allocation {
-                self.alloc.deallocate(ptr, layout);
-            }
-        }
-    }
-}
-
-impl<T, A: Allocator + Clone> Iterator for RawIntoIter<T, A> {
-    type Item = T;
-
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn next(&mut self) -> Option<T> {
-        unsafe { Some(self.iter.next()?.read()) }
-    }
-
-    #[inline]
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        self.iter.size_hint()
-    }
-}
-
-impl<T, A: Allocator + Clone> ExactSizeIterator for RawIntoIter<T, A> {}
-impl<T, A: Allocator + Clone> FusedIterator for RawIntoIter<T, A> {}
-
-/// Iterator which consumes elements without freeing the table storage.
-pub struct RawDrain<'a, T, A: Allocator + Clone = Global> {
-    iter: RawIter<T>,
-
-    // The table is moved into the iterator for the duration of the drain. This
-    // ensures that an empty table is left if the drain iterator is leaked
-    // without dropping.
-    table: ManuallyDrop<RawTable<T, A>>,
-    orig_table: NonNull<RawTable<T, A>>,
-
-    // We don't use a &'a mut RawTable<T> because we want RawDrain to be
-    // covariant over T.
-    marker: PhantomData<&'a RawTable<T, A>>,
-}
-
-impl<T, A: Allocator + Clone> RawDrain<'_, T, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    pub fn iter(&self) -> RawIter<T> {
-        self.iter.clone()
-    }
-}
-
-unsafe impl<T, A: Allocator + Copy> Send for RawDrain<'_, T, A>
-where
-    T: Send,
-    A: Send,
-{
-}
-unsafe impl<T, A: Allocator + Copy> Sync for RawDrain<'_, T, A>
-where
-    T: Sync,
-    A: Sync,
-{
-}
-
-impl<T, A: Allocator + Clone> Drop for RawDrain<'_, T, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn drop(&mut self) {
-        unsafe {
-            // Drop all remaining elements. Note that this may panic.
-            self.iter.drop_elements();
-
-            // Reset the contents of the table now that all elements have been
-            // dropped.
-            self.table.clear_no_drop();
-
-            // Move the now empty table back to its original location.
-            self.orig_table
-                .as_ptr()
-                .copy_from_nonoverlapping(&*self.table, 1);
-        }
-    }
-}
-
-impl<T, A: Allocator + Clone> Iterator for RawDrain<'_, T, A> {
-    type Item = T;
-
-    #[cfg_attr(feature = "inline-more", inline)]
-    fn next(&mut self) -> Option<T> {
-        unsafe {
-            let item = self.iter.next()?;
-            Some(item.read())
-        }
-    }
-
-    #[inline]
-    fn size_hint(&self) -> (usize, Option<usize>) {
-        self.iter.size_hint()
-    }
-}
-
-impl<T, A: Allocator + Clone> ExactSizeIterator for RawDrain<'_, T, A> {}
-impl<T, A: Allocator + Clone> FusedIterator for RawDrain<'_, T, A> {}
-
-/// Iterator over occupied buckets that could match a given hash.
-///
-/// `RawTable` only stores 7 bits of the hash value, so this iterator may return
-/// items that have a hash value different than the one provided. You should
-/// always validate the returned values before using them.
-pub struct RawIterHash<'a, T, A: Allocator + Clone = Global> {
-    inner: RawIterHashInner<'a, A>,
-    _marker: PhantomData<T>,
-}
-
-struct RawIterHashInner<'a, A: Allocator + Clone> {
-    table: &'a RawTableInner<A>,
-
-    // The top 7 bits of the hash.
-    h2_hash: u8,
-
-    // The sequence of groups to probe in the search.
-    probe_seq: ProbeSeq,
-
-    group: Group,
-
-    // The elements within the group with a matching h2-hash.
-    bitmask: BitMaskIter,
-}
-
-impl<'a, T, A: Allocator + Clone> RawIterHash<'a, T, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    #[cfg(feature = "raw")]
-    fn new(table: &'a RawTable<T, A>, hash: u64) -> Self {
-        RawIterHash {
-            inner: RawIterHashInner::new(&table.table, hash),
-            _marker: PhantomData,
-        }
-    }
-}
-impl<'a, A: Allocator + Clone> RawIterHashInner<'a, A> {
-    #[cfg_attr(feature = "inline-more", inline)]
-    #[cfg(feature = "raw")]
-    fn new(table: &'a RawTableInner<A>, hash: u64) -> Self {
-        unsafe {
-            let h2_hash = h2(hash);
-            let probe_seq = table.probe_seq(hash);
-            let group = Group::load(table.ctrl(probe_seq.pos));
-            let bitmask = group.match_byte(h2_hash).into_iter();
-
-            RawIterHashInner {
-                table,
-                h2_hash,
-                probe_seq,
-                group,
-                bitmask,
-            }
-        }
-    }
-}
-
-impl<'a, T, A: Allocator + Clone> Iterator for RawIterHash<'a, T, A> {
-    type Item = Bucket<T>;
-
-    fn next(&mut self) -> Option<Bucket<T>> {
-        unsafe {
-            match self.inner.next() {
-                Some(index) => Some(self.inner.table.bucket(index)),
-                None => None,
-            }
-        }
-    }
-}
-
-impl<'a, A: Allocator + Clone> Iterator for RawIterHashInner<'a, A> {
-    type Item = usize;
-
-    fn next(&mut self) -> Option<Self::Item> {
-        unsafe {
-            loop {
-                if let Some(bit) = self.bitmask.next() {
-                    let index = (self.probe_seq.pos + bit) & self.table.bucket_mask;
-                    return Some(index);
-                }
-                if likely(self.group.match_empty().any_bit_set()) {
-                    return None;
-                }
-                self.probe_seq.move_next(self.table.bucket_mask);
-                self.group = Group::load(self.table.ctrl(self.probe_seq.pos));
-                self.bitmask = self.group.match_byte(self.h2_hash).into_iter();
-            }
-        }
-    }
-}
-
-#[cfg(test)]
-mod test_map {
-    use super::*;
-
-    fn rehash_in_place<T>(table: &mut RawTable<T>, hasher: impl Fn(&T) -> u64) {
-        unsafe {
-            table.table.rehash_in_place(
-                &|table, index| hasher(table.bucket::<T>(index).as_ref()),
-                mem::size_of::<T>(),
-                if mem::needs_drop::<T>() {
-                    Some(mem::transmute(ptr::drop_in_place::<T> as unsafe fn(*mut T)))
-                } else {
-                    None
-                },
-            );
-        }
-    }
-
-    #[test]
-    fn rehash() {
-        let mut table = RawTable::new();
-        let hasher = |i: &u64| *i;
-        for i in 0..100 {
-            table.insert(i, i, hasher);
-        }
-
-        for i in 0..100 {
-            unsafe {
-                assert_eq!(table.find(i, |x| *x == i).map(|b| b.read()), Some(i));
-            }
-            assert!(table.find(i + 100, |x| *x == i + 100).is_none());
-        }
-
-        rehash_in_place(&mut table, hasher);
-
-        for i in 0..100 {
-            unsafe {
-                assert_eq!(table.find(i, |x| *x == i).map(|b| b.read()), Some(i));
-            }
-            assert!(table.find(i + 100, |x| *x == i + 100).is_none());
-        }
-    }
-}
diff --git a/vendor/hashbrown-0.12.3/src/raw/sse2.rs b/vendor/hashbrown-0.12.3/src/raw/sse2.rs
deleted file mode 100644
index a0bf6da80..000000000
--- a/vendor/hashbrown-0.12.3/src/raw/sse2.rs
+++ /dev/null
@@ -1,146 +0,0 @@
-use super::bitmask::BitMask;
-use super::EMPTY;
-use core::mem;
-
-#[cfg(target_arch = "x86")]
-use core::arch::x86;
-#[cfg(target_arch = "x86_64")]
-use core::arch::x86_64 as x86;
-
-pub type BitMaskWord = u16;
-pub const BITMASK_STRIDE: usize = 1;
-pub const BITMASK_MASK: BitMaskWord = 0xffff;
-
-/// Abstraction over a group of control bytes which can be scanned in
-/// parallel.
-///
-/// This implementation uses a 128-bit SSE value.
-#[derive(Copy, Clone)]
-pub struct Group(x86::__m128i);
-
-// FIXME: https://github.com/rust-lang/rust-clippy/issues/3859
-#[allow(clippy::use_self)]
-impl Group {
-    /// Number of bytes in the group.
-    pub const WIDTH: usize = mem::size_of::<Self>();
-
-    /// Returns a full group of empty bytes, suitable for use as the initial
-    /// value for an empty hash table.
-    ///
-    /// This is guaranteed to be aligned to the group size.
-    #[inline]
-    #[allow(clippy::items_after_statements)]
-    pub const fn static_empty() -> &'static [u8; Group::WIDTH] {
-        #[repr(C)]
-        struct AlignedBytes {
-            _align: [Group; 0],
-            bytes: [u8; Group::WIDTH],
-        }
-        const ALIGNED_BYTES: AlignedBytes = AlignedBytes {
-            _align: [],
-            bytes: [EMPTY; Group::WIDTH],
-        };
-        &ALIGNED_BYTES.bytes
-    }
-
-    /// Loads a group of bytes starting at the given address.
-    #[inline]
-    #[allow(clippy::cast_ptr_alignment)] // unaligned load
-    pub unsafe fn load(ptr: *const u8) -> Self {
-        Group(x86::_mm_loadu_si128(ptr.cast()))
-    }
-
-    /// Loads a group of bytes starting at the given address, which must be
-    /// aligned to `mem::align_of::<Group>()`.
-    #[inline]
-    #[allow(clippy::cast_ptr_alignment)]
-    pub unsafe fn load_aligned(ptr: *const u8) -> Self {
-        // FIXME: use align_offset once it stabilizes
-        debug_assert_eq!(ptr as usize & (mem::align_of::<Self>() - 1), 0);
-        Group(x86::_mm_load_si128(ptr.cast()))
-    }
-
-    /// Stores the group of bytes to the given address, which must be
-    /// aligned to `mem::align_of::<Group>()`.
-    #[inline]
-    #[allow(clippy::cast_ptr_alignment)]
-    pub unsafe fn store_aligned(self, ptr: *mut u8) {
-        // FIXME: use align_offset once it stabilizes
-        debug_assert_eq!(ptr as usize & (mem::align_of::<Self>() - 1), 0);
-        x86::_mm_store_si128(ptr.cast(), self.0);
-    }
-
-    /// Returns a `BitMask` indicating all bytes in the group which have
-    /// the given value.
-    #[inline]
-    pub fn match_byte(self, byte: u8) -> BitMask {
-        #[allow(
-            clippy::cast_possible_wrap, // byte: u8 as i8
-            // byte: i32 as u16
-            //   note: _mm_movemask_epi8 returns a 16-bit mask in a i32, the
-            //   upper 16-bits of the i32 are zeroed:
-            clippy::cast_sign_loss,
-            clippy::cast_possible_truncation
-        )]
-        unsafe {
-            let cmp = x86::_mm_cmpeq_epi8(self.0, x86::_mm_set1_epi8(byte as i8));
-            BitMask(x86::_mm_movemask_epi8(cmp) as u16)
-        }
-    }
-
-    /// Returns a `BitMask` indicating all bytes in the group which are
-    /// `EMPTY`.
-    #[inline]
-    pub fn match_empty(self) -> BitMask {
-        self.match_byte(EMPTY)
-    }
-
-    /// Returns a `BitMask` indicating all bytes in the group which are
-    /// `EMPTY` or `DELETED`.
-    #[inline]
-    pub fn match_empty_or_deleted(self) -> BitMask {
-        #[allow(
-            // byte: i32 as u16
-            //   note: _mm_movemask_epi8 returns a 16-bit mask in a i32, the
-            //   upper 16-bits of the i32 are zeroed:
-            clippy::cast_sign_loss,
-            clippy::cast_possible_truncation
-        )]
-        unsafe {
-            // A byte is EMPTY or DELETED iff the high bit is set
-            BitMask(x86::_mm_movemask_epi8(self.0) as u16)
-        }
-    }
-
-    /// Returns a `BitMask` indicating all bytes in the group which are full.
-    #[inline]
-    pub fn match_full(&self) -> BitMask {
-        self.match_empty_or_deleted().invert()
-    }
-
-    /// Performs the following transformation on all bytes in the group:
-    /// - `EMPTY => EMPTY`
-    /// - `DELETED => EMPTY`
-    /// - `FULL => DELETED`
-    #[inline]
-    pub fn convert_special_to_empty_and_full_to_deleted(self) -> Self {
-        // Map high_bit = 1 (EMPTY or DELETED) to 1111_1111
-        // and high_bit = 0 (FULL) to 1000_0000
-        //
-        // Here's this logic expanded to concrete values:
-        //   let special = 0 > byte = 1111_1111 (true) or 0000_0000 (false)
-        //   1111_1111 | 1000_0000 = 1111_1111
-        //   0000_0000 | 1000_0000 = 1000_0000
-        #[allow(
-            clippy::cast_possible_wrap, // byte: 0x80_u8 as i8
-        )]
-        unsafe {
-            let zero = x86::_mm_setzero_si128();
-            let special = x86::_mm_cmpgt_epi8(zero, self.0);
-            Group(x86::_mm_or_si128(
-                special,
-                x86::_mm_set1_epi8(0x80_u8 as i8),
-            ))
-        }
-    }
-}