Let cargo handle that for us

Signed-off-by: Marc-Antoine Perennou <[email protected]>

This is a safe wrapper around ptr::copy, for regions within a single
slice. Previously, safe in-place copying was only available as a side
effect of Vec::drain.

The no_default_libraries was introduced in rust-lang#28578 because the
NetBSD-based rumprun needed to disable the link flag.
This moves the definition to be used by all NetBSD linker flavors to
close rust-lang#49627.

A different solution would be adding -lc but as there is no platform
with explicit -lc, this approach is used.

…chton

define copy_within on slices

This is a safe wrapper around `ptr::copy`, for regions within a single slice. Previously, safe in-place copying was only available as a side effect of `Vec::drain`.

I've wanted this API a couple times in the past, and I figured I'd just whip up a PR to help discuss it. It's possible something like this exists elsewhere and I just missed it. It might also be a big enough addition to warrant an RFC, I'm not sure.

…nkov

Make `dyn` a keyword in the 2018 edition

Proposed in rust-lang#44662 (comment).

…apin

Implement the dbg!(..) macro

Implements the `dbg!(..)` macro due to rust-lang#54306.
cc rust-lang/rfcs#2361

r? @alexcrichton

rustbuild: drop color handling

Let cargo handle that for us

Fixes rust-lang#54322

Needs a beta backport

… r=GuillaumeGomez

add -Zui-testing to rustdoc

Before we depend on the `rustdoc-ui` tests some more, let's make rustdoc act the same as the compiler when they're actually being executed.

…crichton

Make 'proc_macro::MultiSpan' public.

Oversight from rust-lang#52896.

Use no_default_libraries for all NetBSD flavors

The no_default_libraries was introduced in rust-lang#28578 because the
NetBSD-based rumprun needed to disable the link flag.
This moves the definition to be used by all NetBSD linker flavors to
close rust-lang#49627.

A different solution would be adding -lc but as there is no platform
with explicit -lc, this approach is used.

…tebank

add applicability to span_suggestion call

Found another `span_suggestion` call. Issue rust-lang#50723

r? @estebank

…tebank

Add UI test for deref recursion limit printing twice

Closes rust-lang#38940

Does ``NOTE`` in the test need to be changed to ``HELP`` if its in the stderr?
``help: consider adding a `#![recursion_limit="20"]` attribute to your crate``

It doesn't appear to complaining locally that the line isn't set to ``HELP`` in the test, and the guide says
 > HELP and SUGGESTION*
> * Note: SUGGESTION must follow immediately after HELP.

yet there's no concrete suggestion emitted.

r? @estebank

…Simulacrum

Simplify slice's first(_mut) and last(_mut) with get

This change makes these functions easier to read and interpret. I haven't detected any difference in performance locally.

r? @Mark-Simulacrum