[beta] prepare Rust 1.95.0-beta

[cuviper]

Ref: https://forge.rust-lang.org/release/process.html#beta-pr

• Replace version placeholders with 1.95.0
• Bump to beta release
• library/test: always enable unstable features for miri library/test: always enable unstable features for miri #153369

r? cuviper

[rustbot]

stdarch is developed in its own repository. If possible, consider making this change to rust-lang/stdarch instead.

cc @Amanieu, @folkertdev, @sayantn

[cuviper]

@bors r+ rollup=never p=10

[rust-bors]

📌 Commit 23b953f has been approved by cuviper

It is now in the queue for this repository.

[cuviper]

Here's a better log extract:

##[group]Testing stage2 {core} (x86_64-unknown-linux-gnu)
WARNING: Ignoring `RUSTC_WRAPPER` environment variable, Miri does not support wrapping.
Downloading crates ...
Downloaded rand_xorshift v0.4.0
Compiling rand_core v0.9.3
Compiling coretests v0.0.0 (/checkout/library/coretests)
Compiling core v0.0.0 (/checkout/library/core)
Compiling rand_xorshift v0.4.0
Compiling rand v0.9.2
Finished `test` profile [unoptimized + debuginfo] target(s) in 1.28s
Running tests/lib.rs (obj/build/x86_64-unknown-linux-gnu/stage2-std/x86_64-unknown-linux-gnu/debug/deps/coretests-f0af7e27e67d3704)
error: the option `Z` is only accepted on the nightly compiler
error: test failed, to rerun pass `-p coretests --test coretests`
Bootstrap failed while executing `miri --stage 2 library/core --test-args notest`

I can reproduce that locally as well.

@bors r-

[cuviper]

git bisect brought me to #149514 -- cc @adamgemmell@Kobzol

edit: specifically commit dae8ea9

[folkertdev]

I had assumed you'd rebase, but if you're just cherry-picking then I guess #153336 needs to be beta-nominated, specifically commit 2fa37e7 but I suspect that won't cherry-pick cleanly.

That PR fixes an out-of-bounds load in aarch64 SIMD intrinsics that load a non-power-of-2-elements SIMD type.

[cuviper]

@folkertdev: the branch point is right before the src/version bump, so no, we don't rebase after that. Please do nominate on that PR along with your explanation, and we can get to it in a separate backport PR. Or do you think it's bad enough that it will block this now?

[folkertdev]

I'll nominate it, it should be fine to wait a couple of days.

[cuviper]

@bors r+

[rust-bors]

📌 Commit 752b663 has been approved by cuviper

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 1000. This pull request will be tested once the tree is reopened.

[rust-bors]

☀️ Test successful - CI
Approved by: cuviper
Duration: 3h 33m 36s
Pushing ad726b5 to beta...