Specifically, when an override doesn't just forward to an inner type,
document the behavior and that it's preferred over simply assigning
a clone of source. Also, change instances where the second parameter is
"other" to "source".

…eturn suggestion

also in Miri, "base tag" -> "root tag"

static libraries with ar_archive_writer

Fixes rust-lang#107495

…n-backport-nominations, r=GuillaumeGomez

meta: notify #t-rustdoc Zulip stream on backport nominations

In July '23, it was decided to handle rustdoc-specific backport nominations in t-rustdoc meetings going forward ([Zulip announcement](https://rust-lang.zulipchat.com/#narrow/stream/266220-t-rustdoc/topic/T-rustdoc.20backports/near/374828518)). However, t-rustdoc meetings are far too infrequent for them to address nominations on time (contrary to the weekly t-compiler meetings).

Hence GuillaumeGomez and I came to the conclusion that {beta,stable}-nominated rustdoc PRs should be dealt with on a case by case basis, e.g. on Zulip.

This PR attempts to partially automate this process. ~~Sadly, `triagebot` is not quite as flexible has I've hoped. Blocked on `triagebot` improvements (see the `FIXME`s in this PR).~~ (Fixed in rust-lang/triagebot#1791).

r? GuillaumeGomez

…lnay

Document overrides of `clone_from()` in core/std

As mentioned in rust-lang#96979 (comment)

Specifically, when an override doesn't just forward to an inner type, document the behavior and that it's preferred over simply assigning a clone of source. Also, change instances where the second parameter is "other" to "source".

I reused some of the wording over and over for similar impls, but I'm not sure that the wording is actually *good*. Would appreciate feedback about that.

Also, now some of these seem to provide pretty specific guarantees about behavior (e.g. will reuse the exact same allocation iff the len is the same), but I was basing it off of the docs for [`Box::clone_from`](https://doc.rust-lang.org/1.75.0/std/boxed/struct.Box.html#method.clone_from-1) - I'm not sure if providing those strong guarantees is actually good or not.

…thercote

Use same file permissions for ar_archive_writer as the LLVM archive writer

This is required to switch to ar_archive_writer in the future without regressions. In addition to this PR support for reading thin archives needs to be added (rust-lang#107407) to fix all known regressions.

Fixes rust-lang#107495

…, r=oli-obk

interpret: pass MemoryKind to adjust_alloc_base_pointer

Another puzzle piece for rust-lang/miri#3475.

The 2nd commit renames base_pointer -> root_pointer; that's how Tree Borrows already calls them and I think the term is more clear than "base pointer". In particular, this distinguishes it from "base address", since a root pointer can point anywhere into an allocation, not just its base address.

rust-lang#124018 has been rolled up already so I couldn't add it there any more.

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

…r=michaelwoerister

Don't ascend into parent bodies when collecting stmts for possible return suggestion

Fixes rust-lang#124022

…ze, r=jhpratt

Stabilize `const_io_structs`

This PR stabilizes `const_io_structs`.

Tracking issue: rust-lang#78812.
Implementation PR: rust-lang#78811.

FCPs already completed in the tracking issue.

Closes rust-lang#78812.

```@rustbot``` label: +T-libs-api

r? libs-api

Add another expression to weird-exprs.rs

I'm almost feeling bad for this but I decided I don't.
Feel free to close if you don't approve.

…mpiler-errors

Don't error on subtyping of equal types

fixes rust-lang#124054 🤦
fixes rust-lang#124075
fixes rust-lang#124079

r? `@compiler-errors`

…eywiser

Remove libc from rust_get_test_int uses

`rust_test_helpers.c` has a few unfortunate signatures which have made some of our UI tests _technically_ need the `libc` crate. This is my attempt to evict the need of `libc` for `rust_get_test_int`.

I've deleted `tests/ui/abi/foreign/foreign-no-abi.rs` because the test was originally written to check that `native mod` will compile without an ABI specifier. `native mod` was removed years before 1.0 and the test hasn't checked for anything for a long time.