The implied deref to statics introduced by HIR->THIR lowering is only
used to create place expressions, it lacks unsafe semantics.
It is also confusing, as there is no visible `*ident` in the source.
For both classes of "unsafe static" (extern static and static mut)
allow this operation.
We lack a clear story around `thread_local! { static mut }`, which
is actually its own category of item that reuses the static syntax but
has its own rules. It's possible they should be similarly included, but
in the absence of a good reason one way or another, we do not bless it.
Rollup of 9 pull requests
Successful merges:
- #117932 (Correct rustdoc section where we talk about rustdoc emitting errors on invalid code)
- #125990 (Rename `deprecated_safe` lint to `deprecated_safe_2024`)
- #127506 (rustc_target: add known safe s390x target features)
- #127820 (Rewrite and rename `issue-14698`. `issue-33329` and `issue-107094` `run-make` tests to rmake or ui)
- #127923 (Use reuse tool 4.0)
- #128008 (Start using `#[diagnostic::do_not_recommend]` in the standard library)
- #128036 (add more tests)
- #128051 (rustdoc: revert spacing change in item-table)
- #128059 (Add regression test for items list size (#128023))
r? `@ghost`
`@rustbot` modify labels: rollup
rustc_target: add known safe s390x target features
This pull request adds known safe target features for s390x (aka IBM Z systems).
Currently, these features are unstable since stabilizing the target features requires submitting proposals.
The `vector` feature was added in IBM Z13 (`arch11`), and this is a SIMD feature for the newer IBM Z systems.
The `backchain` attribute is the IBM Z way of adding frame pointers like unwinding capabilities (the "frame-pointer" switch on IBM Z and IBM POWER platforms will add _emulated_ frame pointers to the binary, which profilers can't use for unwinding the stack).
Both attributes can be applied at the LLVM module or function levels. However, the `backchain` attribute has to be enabled for all the functions in the call stack to get a successful unwind process.
Uplift most type-system related error reporting from `rustc_infer` to `rustc_trait_selection`
Completes the major part of #127492. The only cleanup that's needed afterwards is to actually use normalization in favor of the callback where needed, and deleting `can_eq_shallow`.
r? lcnr
Sorry for the large diff! Would prefer if comments can be handled in a follow-up (unless they're absolutely dealbreakers) because it seems bitrotty to let this sit.
Try to fix ICE from re-interning an AllocId with different allocation contents
As far as I can tell, based on my investigation in https://github.com/rust-lang/rust/issues/126741, the racy decoding scheme implemented here was never fully correct, but the arrangement of Allocations that's required to ICE the compiler requires some very specific MIR optimizations to create. As far as I can tell, GVN likes to create the problematic pattern, which is why we're noticing this problem now.
So the solution here is to not do racy decoding. If two threads race to decoding an AllocId, one of them is going to sit on a lock until the other is done.
Explain why we require `_` for empty patterns
This adds a note to the "non-exhaustive patterns" diagnostic to explain why we sometimes require extra `_` patterns on empty types. This is one of the two diagnostic improvements I wanted to do before [stabilizing `min_exhaustive_patterns`](https://github.com/rust-lang/rust/pull/122792).
r? ``@compiler-errors``
Just totally fully deny late-bound consts
Kinda don't care about supporting this until we have where clauses on binders. They're super busted and should be reworked in due time, and they are approximately 100% useless until then 😸Fixes#127970Fixes#127009
r? ``@BoxyUwU``
Remove unnecessary impl sorting in queries and metadata
Removes unnecessary impl sorting because queries already return their keys in HIR definition order: https://github.com/rust-lang/rust/issues/120371#issuecomment-1926422838
r? `@cjgillot` or `@lcnr` -- unless I totally misunderstood what was being asked for here? 😆fixes#120371
