Rust-for-Linux
diff --git a/‎Documentation/process/changes.rst
+1-1 b/‎Documentation/process/changes.rst
+1-1
diff --git a/‎rust/alloc/alloc.rs
+3-3 b/‎rust/alloc/alloc.rs
+3-3
diff --git a/‎rust/alloc/boxed.rs
+2-2 b/‎rust/alloc/boxed.rs
+2-2
diff --git a/‎rust/alloc/lib.rs
+4-3 b/‎rust/alloc/lib.rs
+4-3
diff --git a/‎rust/alloc/raw_vec.rs
+6-7 b/‎rust/alloc/raw_vec.rs
+6-7
diff --git a/‎rust/alloc/slice.rs
+2-2 b/‎rust/alloc/slice.rs
+2-2
diff --git a/‎rust/alloc/vec/into_iter.rs
+69-39 b/‎rust/alloc/vec/into_iter.rs
+69-39
@@ -31,7 +31,7 @@ you probably needn't concern yourself with pcmciautils.
 ====================== ===============  ========================================
 GNU C                  5.1              gcc --version
 Clang/LLVM (optional)  13.0.1           clang --version
-Rust (optional)        1.76.0           rustc --version
+Rust (optional)        1.77.0           rustc --version
 bindgen (optional)     0.65.1           bindgen --version
 GNU make               3.82             make --version
 bash                   4.2              bash --version
 
@@ -5,7 +5,7 @@
 #![stable(feature = "alloc_module", since = "1.28.0")]
 
 #[cfg(not(test))]
-use core::intrinsics;
+use core::hint;
 
 #[cfg(not(test))]
 use core::ptr::{self, NonNull};
@@ -210,7 +210,7 @@ impl Global {
                 let new_size = new_layout.size();
 
                 // `realloc` probably checks for `new_size >= old_layout.size()` or something similar.
-                intrinsics::assume(new_size >= old_layout.size());
+                hint::assert_unchecked(new_size >= old_layout.size());
 
                 let raw_ptr = realloc(ptr.as_ptr(), old_layout, new_size);
                 let ptr = NonNull::new(raw_ptr).ok_or(AllocError)?;
@@ -301,7 +301,7 @@ unsafe impl Allocator for Global {
             // SAFETY: `new_size` is non-zero. Other conditions must be upheld by the caller
             new_size if old_layout.align() == new_layout.align() => unsafe {
                 // `realloc` probably checks for `new_size <= old_layout.size()` or something similar.
-                intrinsics::assume(new_size <= old_layout.size());
+                hint::assert_unchecked(new_size <= old_layout.size());
 
                 let raw_ptr = realloc(ptr.as_ptr(), old_layout, new_size);
                 let ptr = NonNull::new(raw_ptr).ok_or(AllocError)?;
 
@@ -26,6 +26,7 @@
 //! Creating a recursive data structure:
 //!
 //! ```
+//! ##[allow(dead_code)]
 //! #[derive(Debug)]
 //! enum List<T> {
 //!     Cons(T, Box<List<T>>),
@@ -194,8 +195,7 @@ mod thin;
 #[fundamental]
 #[stable(feature = "rust1", since = "1.0.0")]
 // The declaration of the `Box` struct must be kept in sync with the
-// `alloc::alloc::box_free` function or ICEs will happen. See the comment
-// on `box_free` for more details.
+// compiler or ICEs will happen.
 pub struct Box<
     T: ?Sized,
     #[unstable(feature = "allocator_api", issue = "32838")] A: Allocator = Global,
 
@@ -105,7 +105,6 @@
 #![feature(allocator_api)]
 #![feature(array_chunks)]
 #![feature(array_into_iter_constructors)]
-#![feature(array_methods)]
 #![feature(array_windows)]
 #![feature(ascii_char)]
 #![feature(assert_matches)]
@@ -122,7 +121,6 @@
 #![feature(const_size_of_val)]
 #![feature(const_waker)]
 #![feature(core_intrinsics)]
-#![feature(core_panic)]
 #![feature(deprecated_suggestion)]
 #![feature(dispatch_from_dyn)]
 #![feature(error_generic_member_access)]
@@ -132,6 +130,7 @@
 #![feature(fmt_internals)]
 #![feature(fn_traits)]
 #![feature(hasher_prefixfree_extras)]
+#![feature(hint_assert_unchecked)]
 #![feature(inline_const)]
 #![feature(inplace_iteration)]
 #![feature(iter_advance_by)]
@@ -141,6 +140,8 @@
 #![feature(maybe_uninit_slice)]
 #![feature(maybe_uninit_uninit_array)]
 #![feature(maybe_uninit_uninit_array_transpose)]
+#![feature(non_null_convenience)]
+#![feature(panic_internals)]
 #![feature(pattern)]
 #![feature(ptr_internals)]
 #![feature(ptr_metadata)]
@@ -149,7 +150,6 @@
 #![feature(set_ptr_value)]
 #![feature(sized_type_properties)]
 #![feature(slice_from_ptr_range)]
-#![feature(slice_group_by)]
 #![feature(slice_ptr_get)]
 #![feature(slice_ptr_len)]
 #![feature(slice_range)]
@@ -182,6 +182,7 @@
 #![feature(const_ptr_write)]
 #![feature(const_trait_impl)]
 #![feature(const_try)]
+#![feature(decl_macro)]
 #![feature(dropck_eyepatch)]
 #![feature(exclusive_range_pattern)]
 #![feature(fundamental)]
 
@@ -4,7 +4,7 @@
 
 use core::alloc::LayoutError;
 use core::cmp;
-use core::intrinsics;
+use core::hint;
 use core::mem::{self, ManuallyDrop, MaybeUninit, SizedTypeProperties};
 use core::ptr::{self, NonNull, Unique};
 use core::slice;
@@ -317,7 +317,7 @@ impl<T, A: Allocator> RawVec<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Aborts
     ///
@@ -358,7 +358,7 @@ impl<T, A: Allocator> RawVec<T, A> {
         }
         unsafe {
             // Inform the optimizer that the reservation has succeeded or wasn't needed
-            core::intrinsics::assume(!self.needs_to_grow(len, additional));
+            hint::assert_unchecked(!self.needs_to_grow(len, additional));
         }
         Ok(())
     }
@@ -381,7 +381,7 @@ impl<T, A: Allocator> RawVec<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Aborts
     ///
@@ -402,7 +402,7 @@ impl<T, A: Allocator> RawVec<T, A> {
         }
         unsafe {
             // Inform the optimizer that the reservation has succeeded or wasn't needed
-            core::intrinsics::assume(!self.needs_to_grow(len, additional));
+            hint::assert_unchecked(!self.needs_to_grow(len, additional));
         }
         Ok(())
     }
@@ -553,7 +553,7 @@ where
         debug_assert_eq!(old_layout.align(), new_layout.align());
         unsafe {
             // The allocator checks for alignment equality
-            intrinsics::assume(old_layout.align() == new_layout.align());
+            hint::assert_unchecked(old_layout.align() == new_layout.align());
             alloc.grow(ptr, old_layout, new_layout)
         }
     } else {
@@ -591,7 +591,6 @@ fn handle_reserve(result: Result<(), TryReserveError>) {
 // `> isize::MAX` bytes will surely fail. On 32-bit and 16-bit we need to add
 // an extra guard for this in case we're running on a platform which can use
 // all 4GB in user-space, e.g., PAE or x32.
-
 #[inline]
 fn alloc_guard(alloc_size: usize) -> Result<(), TryReserveError> {
     if usize::BITS < 64 && alloc_size > isize::MAX as usize {
 
@@ -53,14 +53,14 @@ pub use core::slice::{from_mut, from_ref};
 pub use core::slice::{from_mut_ptr_range, from_ptr_range};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::slice::{from_raw_parts, from_raw_parts_mut};
+#[stable(feature = "slice_group_by", since = "1.77.0")]
+pub use core::slice::{ChunkBy, ChunkByMut};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::slice::{Chunks, Windows};
 #[stable(feature = "chunks_exact", since = "1.31.0")]
 pub use core::slice::{ChunksExact, ChunksExactMut};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::slice::{ChunksMut, Split, SplitMut};
-#[unstable(feature = "slice_group_by", issue = "80552")]
-pub use core::slice::{GroupBy, GroupByMut};
 #[stable(feature = "rust1", since = "1.0.0")]
 pub use core::slice::{Iter, IterMut};
 #[stable(feature = "rchunks", since = "1.31.0")]
 
@@ -20,6 +20,17 @@ use core::ops::Deref;
 use core::ptr::{self, NonNull};
 use core::slice::{self};
 
+macro non_null {
+    (mut $place:expr, $t:ident) => {{
+        #![allow(unused_unsafe)] // we're sometimes used within an unsafe block
+        unsafe { &mut *(ptr::addr_of_mut!($place) as *mut NonNull<$t>) }
+    }},
+    ($place:expr, $t:ident) => {{
+        #![allow(unused_unsafe)] // we're sometimes used within an unsafe block
+        unsafe { *(ptr::addr_of!($place) as *const NonNull<$t>) }
+    }},
+}
+
 /// An iterator that moves out of a vector.
 ///
 /// This `struct` is created by the `into_iter` method on [`Vec`](super::Vec)
@@ -43,10 +54,12 @@ pub struct IntoIter<
     // the drop impl reconstructs a RawVec from buf, cap and alloc
     // to avoid dropping the allocator twice we need to wrap it into ManuallyDrop
     pub(super) alloc: ManuallyDrop<A>,
-    pub(super) ptr: *const T,
-    pub(super) end: *const T, // If T is a ZST, this is actually ptr+len. This encoding is picked so that
-                              // ptr == end is a quick test for the Iterator being empty, that works
-                              // for both ZST and non-ZST.
+    pub(super) ptr: NonNull<T>,
+    /// If T is a ZST, this is actually ptr+len. This encoding is picked so that
+    /// ptr == end is a quick test for the Iterator being empty, that works
+    /// for both ZST and non-ZST.
+    /// For non-ZSTs the pointer is treated as `NonNull<T>`
+    pub(super) end: *const T,
 }
 
 #[stable(feature = "vec_intoiter_debug", since = "1.13.0")]
@@ -70,7 +83,7 @@ impl<T, A: Allocator> IntoIter<T, A> {
     /// ```
     #[stable(feature = "vec_into_iter_as_slice", since = "1.15.0")]
     pub fn as_slice(&self) -> &[T] {
-        unsafe { slice::from_raw_parts(self.ptr, self.len()) }
+        unsafe { slice::from_raw_parts(self.ptr.as_ptr(), self.len()) }
     }
 
     /// Returns the remaining items of this iterator as a mutable slice.
@@ -99,7 +112,7 @@ impl<T, A: Allocator> IntoIter<T, A> {
     }
 
     fn as_raw_mut_slice(&mut self) -> *mut [T] {
-        ptr::slice_from_raw_parts_mut(self.ptr as *mut T, self.len())
+        ptr::slice_from_raw_parts_mut(self.ptr.as_ptr(), self.len())
     }
 
     /// Drops remaining elements and relinquishes the backing allocation.
@@ -126,7 +139,7 @@ impl<T, A: Allocator> IntoIter<T, A> {
         // this creates less assembly
         self.cap = 0;
         self.buf = unsafe { NonNull::new_unchecked(RawVec::NEW.ptr()) };
-        self.ptr = self.buf.as_ptr();
+        self.ptr = self.buf;
         self.end = self.buf.as_ptr();
 
         // Dropping the remaining elements can panic, so this needs to be
@@ -138,9 +151,9 @@ impl<T, A: Allocator> IntoIter<T, A> {
 
     /// Forgets to Drop the remaining elements while still allowing the backing allocation to be freed.
     pub(crate) fn forget_remaining_elements(&mut self) {
-        // For th ZST case, it is crucial that we mutate `end` here, not `ptr`.
+        // For the ZST case, it is crucial that we mutate `end` here, not `ptr`.
         // `ptr` must stay aligned, while `end` may be unaligned.
-        self.end = self.ptr;
+        self.end = self.ptr.as_ptr();
     }
 
     #[cfg(not(no_global_oom_handling))]
@@ -162,7 +175,7 @@ impl<T, A: Allocator> IntoIter<T, A> {
                 // say that they're all at the beginning of the "allocation".
                 0..this.len()
             } else {
-                this.ptr.sub_ptr(buf)..this.end.sub_ptr(buf)
+                this.ptr.sub_ptr(this.buf)..this.end.sub_ptr(buf)
             };
             let cap = this.cap;
             let alloc = ManuallyDrop::take(&mut this.alloc);
@@ -189,37 +202,43 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
 
     #[inline]
     fn next(&mut self) -> Option<T> {
-        if self.ptr == self.end {
-            None
-        } else if T::IS_ZST {
-            // `ptr` has to stay where it is to remain aligned, so we reduce the length by 1 by
-            // reducing the `end`.
-            self.end = self.end.wrapping_byte_sub(1);
-
-            // Make up a value of this ZST.
-            Some(unsafe { mem::zeroed() })
+        if T::IS_ZST {
+            if self.ptr.as_ptr() == self.end as *mut _ {
+                None
+            } else {
+                // `ptr` has to stay where it is to remain aligned, so we reduce the length by 1 by
+                // reducing the `end`.
+                self.end = self.end.wrapping_byte_sub(1);
+
+                // Make up a value of this ZST.
+                Some(unsafe { mem::zeroed() })
+            }
         } else {
-            let old = self.ptr;
-            self.ptr = unsafe { self.ptr.add(1) };
+            if self.ptr == non_null!(self.end, T) {
+                None
+            } else {
+                let old = self.ptr;
+                self.ptr = unsafe { old.add(1) };
 
-            Some(unsafe { ptr::read(old) })
+                Some(unsafe { ptr::read(old.as_ptr()) })
+            }
         }
     }
 
     #[inline]
     fn size_hint(&self) -> (usize, Option<usize>) {
         let exact = if T::IS_ZST {
-            self.end.addr().wrapping_sub(self.ptr.addr())
+            self.end.addr().wrapping_sub(self.ptr.as_ptr().addr())
         } else {
-            unsafe { self.end.sub_ptr(self.ptr) }
+            unsafe { non_null!(self.end, T).sub_ptr(self.ptr) }
         };
         (exact, Some(exact))
     }
 
     #[inline]
     fn advance_by(&mut self, n: usize) -> Result<(), NonZeroUsize> {
         let step_size = self.len().min(n);
-        let to_drop = ptr::slice_from_raw_parts_mut(self.ptr as *mut T, step_size);
+        let to_drop = ptr::slice_from_raw_parts_mut(self.ptr.as_ptr(), step_size);
         if T::IS_ZST {
             // See `next` for why we sub `end` here.
             self.end = self.end.wrapping_byte_sub(step_size);
@@ -261,7 +280,7 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
             // Safety: `len` indicates that this many elements are available and we just checked that
             // it fits into the array.
             unsafe {
-                ptr::copy_nonoverlapping(self.ptr, raw_ary.as_mut_ptr() as *mut T, len);
+                ptr::copy_nonoverlapping(self.ptr.as_ptr(), raw_ary.as_mut_ptr() as *mut T, len);
                 self.forget_remaining_elements();
                 return Err(array::IntoIter::new_unchecked(raw_ary, 0..len));
             }
@@ -270,7 +289,7 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
         // Safety: `len` is larger than the array size. Copy a fixed amount here to fully initialize
         // the array.
         return unsafe {
-            ptr::copy_nonoverlapping(self.ptr, raw_ary.as_mut_ptr() as *mut T, N);
+            ptr::copy_nonoverlapping(self.ptr.as_ptr(), raw_ary.as_mut_ptr() as *mut T, N);
             self.ptr = self.ptr.add(N);
             Ok(raw_ary.transpose().assume_init())
         };
@@ -288,26 +307,33 @@ impl<T, A: Allocator> Iterator for IntoIter<T, A> {
         // Also note the implementation of `Self: TrustedRandomAccess` requires
         // that `T: Copy` so reading elements from the buffer doesn't invalidate
         // them for `Drop`.
-        unsafe { if T::IS_ZST { mem::zeroed() } else { ptr::read(self.ptr.add(i)) } }
+        unsafe { if T::IS_ZST { mem::zeroed() } else { self.ptr.add(i).read() } }
     }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T, A: Allocator> DoubleEndedIterator for IntoIter<T, A> {
     #[inline]
     fn next_back(&mut self) -> Option<T> {
-        if self.end == self.ptr {
-            None
-        } else if T::IS_ZST {
-            // See above for why 'ptr.offset' isn't used
-            self.end = self.end.wrapping_byte_sub(1);
-
-            // Make up a value of this ZST.
-            Some(unsafe { mem::zeroed() })
+        if T::IS_ZST {
+            if self.end as *mut _ == self.ptr.as_ptr() {
+                None
+            } else {
+                // See above for why 'ptr.offset' isn't used
+                self.end = self.end.wrapping_byte_sub(1);
+
+                // Make up a value of this ZST.
+                Some(unsafe { mem::zeroed() })
+            }
         } else {
-            self.end = unsafe { self.end.sub(1) };
+            if non_null!(self.end, T) == self.ptr {
+                None
+            } else {
+                let new_end = unsafe { non_null!(self.end, T).sub(1) };
+                *non_null!(mut self.end, T) = new_end;
 
-            Some(unsafe { ptr::read(self.end) })
+                Some(unsafe { ptr::read(new_end.as_ptr()) })
+            }
         }
     }
 
@@ -333,7 +359,11 @@ impl<T, A: Allocator> DoubleEndedIterator for IntoIter<T, A> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T, A: Allocator> ExactSizeIterator for IntoIter<T, A> {
     fn is_empty(&self) -> bool {
-        self.ptr == self.end
+        if T::IS_ZST {
+            self.ptr.as_ptr() == self.end as *mut _
+        } else {
+            self.ptr == non_null!(self.end, T)
+        }
     }
 }