Allows getting the slices directly, rather than just through an iterator as in `array_chunks(_mut)`.  The constructors for those iterators are then written in terms of these methods, so the iterator constructors no longer have any `unsafe` of their own.

Signed-off-by: Marc-Antoine Perennou <Marc-Antoine@Perennou.com>

Fixes rust-lang#57642

As per rust-lang#76462

This change is needed for compiler-builtins to check for this feature
when implementing memcpy/memset. See:
  rust-lang/compiler-builtins#365

The change just does compile-time detection. I think that runtime
detection will have to come in a follow-up CL to std-detect.

Like all the CPU feature flags, this just references rust-lang#44839

Signed-off-by: Joe Richey <joerichey@google.com>

Add links

Fix typo

Use `sequence`

Fix typo

Fix broken link

Fix broken link

Fix broken link

Fix broken links

Fix broken links

Co-authored-by: lcnr <bastian_kauschke@hotmail.de>

…lbertodt

Add [T]::as_chunks(_mut)

Allows getting the slices directly, rather than just through an iterator as in `array_chunks(_mut)`.  The constructors for those iterators are then written in terms of these methods, so the iterator constructors no longer have any `unsafe` of their own.

Unstable, of course. rust-lang#74985

…mulacrum

add system-llvm-libunwind config option

allows using the system-wide llvm-libunwind as the unwinder

Workaround for rust-lang#76020

Prefer to use `print_def_path`

Follow-up of rust-lang#71310 (comment)

…rk-Simulacrum

Add test for bad NLL higher-ranked subtype

Fixes rust-lang#57642

Update description for error E0308

Fixes rust-lang#76462

r? @camelid

…Simulacrum

Use check-pass in single-use-lifetime ui tests

Rationale: the `single_use_lifetimes` lint is used during late name resolution, which is within the scope of `check-pass` and does not require codegen or linking.

Helps remove some FIXMES associated with rust-lang#62277. Additionally tidies touched test files.

Add lexicographical comparison doc

close rust-lang#72255

Make some functions private that don't have to be public

r? @GuillaumeGomez

Use its own `TypeckResults` to avoid ICE

Fixes rust-lang#75962

Use ? in core/std macros

…-schievink

Fix typo in debug statement

Add some regression tests

Closes rust-lang#75763.
Closes rust-lang#76179.

fix(docs): typo in BufWriter documentation

This PR fixes a small typo in the BufWriter documentation. The current documentation looks like this:

![2020-10-26-111501_438x83_scrot](https://user-images.githubusercontent.com/238549/97160357-83d3a000-177c-11eb-8a35-3cdd3a7d89de.png)

The `<u8>` at the end is mangled by Markdown. This PR makes the `BufWriter` documentation like the `BufReader` one:

https://github.com/rust-lang/rust/blob/master/library/std/src/io/buffered/bufreader.rs#L16

I'm tagging Steve as per the Rustc dev guide.

r? @steveklabnik

Add compiler support for LLVM's x86_64 ERMSB feature

This change is needed for compiler-builtins to check for this feature
when implementing memcpy/memset. See:
  rust-lang/compiler-builtins#365

Without this change, the following code compiles, but does nothing:
```rust
#[cfg(target_feature = "ermsb")]
pub unsafe fn ermsb_memcpy() { ... }
```

The change just does compile-time detection. I think that runtime
detection will have to come in a follow-up CL to std-detect.

Like all the CPU feature flags, this just references rust-lang#44839

Signed-off-by: Joe Richey <joerichey@google.com>

Fix typo in lint description

…schievink

Improve formatting of hash collections docs