…Rust program

Plus a tiny bit of reformatting.

…_drops, r=wesleywiser

make it possible to enable const_precise_live_drops per-function

This makes const_precise_live_drops work with rustc_allow_const_fn_unstable so that we can stabilize individual functions that rely on const_precise_live_drops.

The goal is that we can use that to stabilize some of rust-lang#67441 without having to stabilize const_precise_live_drops.

exit: explain our expectations for the exit handlers registered in a Rust program

This documents the position of ``@Amanieu`` and others in rust-lang#126600: a library with an atexit handler that destroys state that other threads could still be working on is buggy. We do not consider it acceptable for a library to say "you must call the following cleanup function before exiting from `main` or calling `exit`". I don't know if this is established ``@rust-lang/libs-api``  consensus so I presume this will have to go through FCP.

Given that Rust supports concurrency, I don't think there is any way to write a sound Rust wrapper around a library that has such a required cleanup function: even if we made `exit` unsafe, and the Rust wrapper used the scope-with-callback approach to ensure it can run cleanup code before returning from the wrapper (like `thread::scope`), one could still call this wrapper in a second thread and then return from `main` while the wrapper runs. Making this sound would require `std` to provide a way to "block" returning from `main`, so that while the wrapper runs returning from `main` waits until the wrapper is done... that just doesn't seem feasible.

The `exit` docs do not seem like the best place to document this, but I also couldn't think of a better one.

…tlarsan68

Fix tidy to allow `edition = "2024"` in `Cargo.toml`

Needed to upgrade to edition 2024 eventually.

…pastorino

Use unsafe extern blocks throughout the compiler

Making this change in preparation for edition 2024.

r? spastorino

Fix typos in floating-point primitive type docs

Fixes a few typos. Also reflows the text of a couple of paragraphs in the source code to the standard line width to make the source easier to read (will have no effect on the rendered documentation).

…rgau

More `unreachable_pub`

Add `unreachable_pub` checking to some more compiler crates. A follow-up to rust-lang#126013.

r? ``@Urgau``

…r=petrochenkov

ABI compat check: detect unadjusted ABI mismatches

fix Pointer to reference conversion docs

The aliasing rules documented in rust-lang#128157 are wrong, this fixes them.