Auto merge of rust-lang#79220 - Dylan-DPC:rollup-5bpbygd, r=Dylan-DPC

Rollup of 11 pull requests

Successful merges:

 - rust-lang#79119 (Clarify availability of atomic operations)
 - rust-lang#79123 (Add u128 and i128 integer tests)
 - rust-lang#79177 (Test drop order for (destructuring) assignments)
 - rust-lang#79181 (rustdoc: add [src] links to methods on a trait's page)
 - rust-lang#79183 (Make compiletest testing use the local sysroot)
 - rust-lang#79185 (expand/resolve: Pre-requisites to "Turn `#[derive]` into a regular macro attribute")
 - rust-lang#79193 (Revert rust-lang#78969 "Normalize function type during validation")
 - rust-lang#79194 (Make as{_mut,}_slice on array::IntoIter public)
 - rust-lang#79204 (Add jyn514 email alias to mailmap)
 - rust-lang#79212 (Move `rustc_ty` -> `rustc_ty_utils`)
 - rust-lang#79217 (Add the "memcpy" doc alias to slice::copy_from_slice)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

Author: bors

core/src/array/iter.rs

@@ -69,7 +69,8 @@ impl<T, const N: usize> IntoIter<T, N> {
 
     /// Returns an immutable slice of all elements that have not been yielded
     /// yet.
-    fn as_slice(&self) -> &[T] {
+    #[unstable(feature = "array_value_iter_slice", issue = "65798")]
+    pub fn as_slice(&self) -> &[T] {
         // SAFETY: We know that all elements within `alive` are properly initialized.
         unsafe {
             let slice = self.data.get_unchecked(self.alive.clone());
@@ -78,7 +79,8 @@ impl<T, const N: usize> IntoIter<T, N> {
     }
 
     /// Returns a mutable slice of all elements that have not been yielded yet.
-    fn as_mut_slice(&mut self) -> &mut [T] {
+    #[unstable(feature = "array_value_iter_slice", issue = "65798")]
+    pub fn as_mut_slice(&mut self) -> &mut [T] {
         // SAFETY: We know that all elements within `alive` are properly initialized.
         unsafe {
             let slice = self.data.get_unchecked_mut(self.alive.clone());

core/src/slice/mod.rs

@@ -2724,6 +2724,7 @@ impl<T> [T] {
     ///
     /// [`clone_from_slice`]: #method.clone_from_slice
     /// [`split_at_mut`]: #method.split_at_mut
+    #[doc(alias = "memcpy")]
     #[stable(feature = "copy_from_slice", since = "1.9.0")]
     pub fn copy_from_slice(&mut self, src: &[T])
     where

core/src/sync/atomic.rs

@@ -47,9 +47,16 @@
 //!
 //! * PowerPC and MIPS platforms with 32-bit pointers do not have `AtomicU64` or
 //!   `AtomicI64` types.
-//! * ARM platforms like `armv5te` that aren't for Linux do not have any atomics
-//!   at all.
-//! * ARM targets with `thumbv6m` do not have atomic operations at all.
+//! * ARM platforms like `armv5te` that aren't for Linux only provide `load`
+//!   and `store` operations, and do not support Compare and Swap (CAS)
+//!   operations, such as `swap`, `fetch_add`, etc. Additionally on Linux,
+//!   these CAS operations are implemented via [operating system support], which
+//!   may come with a performance penalty.
+//! * ARM targets with `thumbv6m` only provide `load` and `store` operations,
+//!   and do not support Compare and Swap (CAS) operations, such as `swap`,
+//!   `fetch_add`, etc.
+//!
+//! [operating system support]: https://www.kernel.org/doc/Documentation/arm/kernel_user_helpers.txt
 //!
 //! Note that future platforms may be added that also do not have support for
 //! some atomic operations. Maximally portable code will want to be careful

core/tests/num/i128.rs

@@ -0,0 +1 @@
+int_module!(i128, i128);

core/tests/num/int_macros.rs

@@ -131,9 +131,9 @@ macro_rules! int_module {
                 assert_eq!(B.rotate_left(0), B);
                 assert_eq!(C.rotate_left(0), C);
                 // Rotating by a multiple of word size should also have no effect
-                assert_eq!(A.rotate_left(64), A);
-                assert_eq!(B.rotate_left(64), B);
-                assert_eq!(C.rotate_left(64), C);
+                assert_eq!(A.rotate_left(128), A);
+                assert_eq!(B.rotate_left(128), B);
+                assert_eq!(C.rotate_left(128), C);
             }
 
             #[test]

core/tests/num/mod.rs

@@ -11,6 +11,7 @@ use core::str::FromStr;
 #[macro_use]
 mod int_macros;
 
+mod i128;
 mod i16;
 mod i32;
 mod i64;
@@ -19,6 +20,7 @@ mod i8;
 #[macro_use]
 mod uint_macros;
 
+mod u128;
 mod u16;
 mod u32;
 mod u64;

core/tests/num/u128.rs

@@ -0,0 +1 @@
+uint_module!(u128, u128);

core/tests/num/uint_macros.rs

@@ -96,9 +96,9 @@ macro_rules! uint_module {
                 assert_eq!(B.rotate_left(0), B);
                 assert_eq!(C.rotate_left(0), C);
                 // Rotating by a multiple of word size should also have no effect
-                assert_eq!(A.rotate_left(64), A);
-                assert_eq!(B.rotate_left(64), B);
-                assert_eq!(C.rotate_left(64), C);
+                assert_eq!(A.rotate_left(128), A);
+                assert_eq!(B.rotate_left(128), B);
+                assert_eq!(C.rotate_left(128), C);
             }
 
             #[test]