As per the libs team decision in rust-lang#58935.

Closes rust-lang#58935

In `splice_lines`, there is some arithmetic to compute the required
alignment such that future substitutions in a suggestion are aligned
correctly. However, this assumed that the current substitution's span
was only on a single line. In circumstances where this was not true, it
could result in a arithmetic overflow when the substitution's end
column was less than the substitution's start column.

Signed-off-by: David Wood <david.wood@huawei.com>

…typeck

The fuchsia platform is in the process of softly transitioning over to
using a new value for ZX_INFO_PROCESS with a new corresponding struct.
This change migrates libstd.

See fxrev.dev/510478 and fxbug.dev/30751 for more detail.

…_unchecked, r=oli-obk

Stabilize `unreachable_unchecked` as `const fn`

Closes rust-lang#53188

This PR stabilizes `core::hint::unreachable_unchecked` as `const fn`. MIRI is able to detect when this method is called. Stabilization was delayed until `const_panic` was stabilized so as to avoid users calling this method in its place (thus resulting in runtime UB). With rust-lang#89508, that is no longer an issue.

```@rustbot``` label +A-const-eval +A-const-fn +T-lang +S-blocked

(not sure why it's T-lang, but that's what the tracking issue is)

…htriplett

Remove alloc::prelude

As per the libs team decision in rust-lang#58935.

Closes rust-lang#58935

…ustdoc-json-types, r=CraftSpider

Moved format-version constant to rustdoc-json-types

Addresses rust-lang#88620

Moved format-version constant from rustdoc to rustdoc-json-types.

…ultiple-lines, r=oli-obk

emitter: current substitution can be multi-line

Fixes rust-lang#89280.

In `splice_lines`, there is some arithmetic to compute the required alignment such that future substitutions in a suggestion are aligned correctly. However, this assumed that the current substitution's span was only on a single line. In circumstances where this was not true, it could result in a arithmetic overflow when the substitution's end column was less than the substitution's start column.

r? ```@oli-obk```

…=estebank

Emit impl difference error for GenericBoundFailure too

Fixes rust-lang#86787

r? ```@estebank```

…tsakis

Some outlives cleanup

No semantic changes here, only moving code around + using `LocalDefId` instead of `HirId`

r? ```@nikomatsakis```

Add some GATs related regression tests

Closes rust-lang#88287, closes rust-lang#88405

[fuchsia] Update process info struct

The fuchsia platform is in the process of softly transitioning over to
using a new value for ZX_INFO_PROCESS with a new corresponding struct.
This change migrates libstd.

See [fxrev.dev/510478](https://fxrev.dev/510478) and [fxbug.dev/30751](https://fxbug.dev/30751) for more detail.

… r=m-ou-se

updating docs to mention usage of AtomicBool

Mouse mentioned we should point out that atomic bool is used by the std lib these days. ( m-ou-se/getrandom#1 )