…r of CPUs

Use libc::sched_getaffinity and count the number of CPUs in the returned
mask. This handles cases where the process doesn't have access to all
CPUs, such as when limited via taskset or similar.

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

…affinity, r=m-ou-se

Make `std::thread::available_concurrency` support process-limited number of CPUs

Use `libc::sched_getaffinity` and count the number of CPUs in the returned mask. This handles cases where the process doesn't have access to all CPUs, such as when limited via `taskset` or similar.

This also covers cgroup cpusets.

…_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

… 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 )