Auto merge of #66175 - JohnTitor:rollup-ihqk5vn, r=JohnTitor

Rollup of 12 pull requests

Successful merges:

 - #65794 (gate rustc_on_unimplemented under rustc_attrs)
 - #65945 (Optimize long-linker-command-line test)
 - #66044 (Improve uninit/zeroed lint)
 - #66076 (HIR docs: mention how to resolve method paths)
 - #66084 (Do not require extra LLVM backends for `x.py test` to pass)
 - #66111 (improve from_raw_parts docs)
 - #66114 (Improve std::thread::Result documentation)
 - #66117 (Fixed PhantomData markers in Arc and Rc)
 - #66146 (Remove unused parameters in `__thread_local_inner`)
 - #66147 (Miri: Refactor to_scalar_ptr out of existence)
 - #66162 (Fix broken link in README)
 - #66171 (Update link on CONTRIBUTING.md)

Failed merges:

r? @ghost

Author: bors

Diff for: CONTRIBUTING.md

@@ -105,7 +105,7 @@ contributions to the compiler and the standard library. It also lists some
 really useful commands to the build system (`./x.py`), which could save you a
 lot of time.
 
-[rustcguidebuild]: https://rust-lang.github.io/rustc-guide/how-to-build-and-run.html
+[rustcguidebuild]: https://rust-lang.github.io/rustc-guide/building/how-to-build-and-run.html
 
 ## Pull Requests
 [pull-requests]: #pull-requests

Diff for: README.md

@@ -21,7 +21,7 @@ The Rust build system has a Python script called `x.py` to bootstrap building
 the compiler. More information about it may be found by running `./x.py --help`
 or reading the [rustc guide][rustcguidebuild].
 
-[rustcguidebuild]: https://rust-lang.github.io/rustc-guide/how-to-build-and-run.html
+[rustcguidebuild]: https://rust-lang.github.io/rustc-guide/building/how-to-build-and-run.html
 
 ### Building on *nix
 1. Make sure you have installed the dependencies:

Diff for: src/doc/unstable-book/src/language-features/on-unimplemented.md

@@ -90,7 +90,7 @@ impl<T> Clone for Iter<'_, T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct IterMut<'a, T: 'a> {
     // We do *not* exclusively own the entire list here, references to node's `element`
-    // have been handed out by the iterator!  So be careful when using this; the methods
+    // have been handed out by the iterator! So be careful when using this; the methods
     // called must be aware that there can be aliasing pointers to `element`.
     list: &'a mut LinkedList<T>,
     head: Option<NonNull<Node<T>>>,

Diff for: src/liballoc/collections/linked_list.rs

@@ -116,7 +116,7 @@
 #![feature(unsize)]
 #![feature(unsized_locals)]
 #![feature(allocator_internals)]
-#![feature(on_unimplemented)]
+#![cfg_attr(bootstrap, feature(on_unimplemented))]
 #![feature(rustc_const_unstable)]
 #![feature(slice_partition_dedup)]
 #![feature(maybe_uninit_extra, maybe_uninit_slice)]

Diff for: src/liballoc/lib.rs

@@ -280,7 +280,7 @@ struct RcBox<T: ?Sized> {
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Rc<T: ?Sized> {
     ptr: NonNull<RcBox<T>>,
-    phantom: PhantomData<T>,
+    phantom: PhantomData<RcBox<T>>,
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]

Diff for: src/liballoc/rc.rs

@@ -687,7 +687,7 @@ impl String {
     /// checked:
     ///
     /// * The memory at `ptr` needs to have been previously allocated by the
-    ///   same allocator the standard library uses.
+    ///   same allocator the standard library uses, with a required alignment of exactly 1.
     /// * `length` needs to be less than or equal to `capacity`.
     /// * `capacity` needs to be the correct value.
     ///

Diff for: src/liballoc/string.rs

@@ -195,7 +195,7 @@ const MAX_REFCOUNT: usize = (isize::MAX) as usize;
 #[stable(feature = "rust1", since = "1.0.0")]
 pub struct Arc<T: ?Sized> {
     ptr: NonNull<ArcInner<T>>,
-    phantom: PhantomData<T>,
+    phantom: PhantomData<ArcInner<T>>,
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]

Diff for: src/liballoc/sync.rs

@@ -137,9 +137,11 @@
 //! use std::cell::Cell;
 //! use std::ptr::NonNull;
 //! use std::intrinsics::abort;
+//! use std::marker::PhantomData;
 //!
 //! struct Rc<T: ?Sized> {
-//!     ptr: NonNull<RcBox<T>>
+//!     ptr: NonNull<RcBox<T>>,
+//!     phantom: PhantomData<RcBox<T>>,
 //! }
 //!
 //! struct RcBox<T: ?Sized> {
@@ -151,7 +153,10 @@
 //! impl<T: ?Sized> Clone for Rc<T> {
 //!     fn clone(&self) -> Rc<T> {
 //!         self.inc_strong();
-//!         Rc { ptr: self.ptr }
+//!         Rc {
+//!             ptr: self.ptr,
+//!             phantom: PhantomData,
+//!         }
 //!     }
 //! }
 //!

Diff for: src/libcore/cell.rs

@@ -89,7 +89,7 @@
 #![feature(nll)]
 #![feature(exhaustive_patterns)]
 #![feature(no_core)]
-#![feature(on_unimplemented)]
+#![cfg_attr(bootstrap, feature(on_unimplemented))]
 #![feature(optin_builtin_traits)]
 #![feature(prelude_import)]
 #![feature(repr_simd, platform_intrinsics)]

Diff for: src/libcore/lib.rs

@@ -440,6 +440,7 @@ impl<T> MaybeUninit<T> {
     /// ```
     #[stable(feature = "maybe_uninit", since = "1.36.0")]
     #[inline(always)]
+    #[cfg_attr(all(not(bootstrap)), rustc_diagnostic_item = "assume_init")]
     pub unsafe fn assume_init(self) -> T {
         intrinsics::panic_if_uninhabited::<T>();
         ManuallyDrop::into_inner(self.value)

Diff for: src/libcore/mem/maybe_uninit.rs

@@ -18,6 +18,10 @@
 //! * A [null] pointer is *never* valid, not even for accesses of [size zero][zst].
 //! * All pointers (except for the null pointer) are valid for all operations of
 //!   [size zero][zst].
+//! * For a pointer to be valid, it is necessary, but not always sufficient, that the pointer
+//!   be *dereferencable*: the memory range of the given size starting at the pointer must all be
+//!   within the bounds of a single allocated object. Note that in Rust,
+//!   every (stack-allocated) variable is considered a separate allocated object.
 //! * All accesses performed by functions in this module are *non-atomic* in the sense
 //!   of [atomic operations] used to synchronize between threads. This means it is
 //!   undefined behavior to perform two concurrent accesses to the same location from different
@@ -221,10 +225,15 @@ pub(crate) struct FatPtr<T> {
     pub(crate) len: usize,
 }
 
-/// Forms a slice from a pointer and a length.
+/// Forms a raw slice from a pointer and a length.
 ///
 /// The `len` argument is the number of **elements**, not the number of bytes.
 ///
+/// This function is safe, but actually using the return value is unsafe.
+/// See the documentation of [`from_raw_parts`] for slice safety requirements.
+///
+/// [`from_raw_parts`]: ../../std/slice/fn.from_raw_parts.html
+///
 /// # Examples
 ///
 /// ```rust
@@ -243,12 +252,16 @@ pub fn slice_from_raw_parts<T>(data: *const T, len: usize) -> *const [T] {
     unsafe { Repr { raw: FatPtr { data, len } }.rust }
 }
 
-/// Performs the same functionality as [`from_raw_parts`], except that a
-/// mutable slice is returned.
+/// Performs the same functionality as [`slice_from_raw_parts`], except that a
+/// raw mutable slice is returned, as opposed to a raw immutable slice.
 ///
-/// See the documentation of [`from_raw_parts`] for more details.
+/// See the documentation of [`slice_from_raw_parts`] for more details.
 ///
-/// [`from_raw_parts`]: ../../std/slice/fn.from_raw_parts.html
+/// This function is safe, but actually using the return value is unsafe.
+/// See the documentation of [`from_raw_parts_mut`] for slice safety requirements.
+///
+/// [`slice_from_raw_parts`]: fn.slice_from_raw_parts.html
+/// [`from_raw_parts_mut`]: ../../std/slice/fn.from_raw_parts_mut.html
 #[inline]
 #[unstable(feature = "slice_from_raw_parts", reason = "recently added", issue = "36925")]
 pub fn slice_from_raw_parts_mut<T>(data: *mut T, len: usize) -> *mut [T] {