Include `library/stdarch` for `CURRENT_RUSTC_VERSION` updates
Our tool `replace-version-placeholder` uses the `tidy` file walker and its
directory filter, but that skips `library/stdarch` which we do need for public
stability markers. This PR adds a local filter function that explicitly allows
that path.
The commit for 1.94 `stdarch` updates is coming from beta rust-lang/rust#152187.
ci: Lock cross toolchain version and update docs
This PR locks the cross-toolchain component version to avoid unexpected changes when bumping crosstool-ng, and updates the toolchain configuration in the docs to match the actual setup.
try-job: dist-arm-linux-musl
try-job: dist-loongarch64-linux
try-job: dist-loongarch64-musl
try-job: dist-powerpc64-linux-musl
try-job: dist-powerpc64le-linux-gnu
try-job: dist-powerpc64le-linux-musl
UnsafePinned: implement opsem effects of UnsafeUnpin
This implements the next step for https://github.com/rust-lang/rust/issues/125735: actually making `UnsafePinned` have special opsem effects by suppressing the `noalias` *even if* the type is wrapped in an `Unpin` wrapper.
For backwards compatibility we also still keep the `Unpin` hack, i.e. a type must be both `Unpin` and `UnsafeUnpin` to get `noalias`.
Port #[rustc_test_marker] to the attribute parser
Tracking issue: https://github.com/rust-lang/rust/issues/131229
Targets:
Const is for normal tests (const test::TestDescAndFn is inserted before the test fn)
Const/Static/Fn is for custom_test_framework's #[test_case] e.g. tests/ui/custom_test_frameworks/full.rs
r? @JonathanBrouwer
Again I left the use-sites as is since they are early uses.
Make operational semantics of pattern matching independent of crate and module
The question of "when does matching an enum against a pattern of one of its variants read its discriminant" is currently an underspecified part of the language, causing weird behavior around borrowck, drop order, and UB.
Of course, in the common cases, the discriminant must be read to distinguish the variant of the enum, but currently the following exceptions are implemented:
1. If the enum has only one variant, we currently skip the discriminant read.
- This has the advantage that single-variant enums behave the same way as structs in this regard.
- However, it means that if the discriminant exists in the layout, we can't say that this discriminant being invalid is UB. This makes me particularly uneasy in its interactions with niches – consider the following example ([playground](https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=5904a6155cbdd39af4a2e7b1d32a9b1a)), where miri currently doesn't detect any UB (because the semantics don't specify any):
<details><summary>Example 1</summary>
```rust
#![allow(dead_code)]
use core::mem::{size_of, transmute};
#[repr(u8)]
enum Inner {
X(u8),
}
enum Outer {
A(Inner),
B(u8),
}
fn f(x: &Inner) {
match x {
Inner::X(v) => {
println!("{v}");
}
}
}
fn main() {
assert_eq!(size_of::<Inner>(), 2);
assert_eq!(size_of::<Outer>(), 2);
let x = Outer::B(42);
let y = &x;
f(unsafe { transmute(y) });
}
```
</details>
2. For the purpose of the above, enums with marked with `#[non_exhaustive]` are always considered to have multiple variants when observed from foreign crates, but the actual number of variants is considered in the current crate.
- This means that whether code has UB can depend on which crate it is in: https://github.com/rust-lang/rust/issues/147722
- In another case of `#[non_exhaustive]` affecting the runtime semantics, its presence or absence can change what gets captured by a closure, and by extension, the drop order: https://github.com/rust-lang/rust/issues/147722#issuecomment-3674554872
- Also at the above link, there is an example where removing `#[non_exhaustive]` can cause borrowck to suddenly start failing in another crate.
3. Moreover, we currently make a more specific check: we only read the discriminant if there is more than one *inhabited* variant in the enum.
- This means that the semantics can differ between `foo<!>`, and a copy of `foo` where `T` was manually replaced with `!`: rust-lang/rust#146803
- Moreover, due to the privacy rules for inhabitedness, it means that the semantics of code can depend on the *module* in which it is located.
- Additionally, this inhabitedness rule is even uglier due to the fact that closure capture analysis needs to happen before we can determine whether types are uninhabited, which means that whether the discriminant read happens has a different answer specifically for capture analysis.
- For the two above points, see the following example ([playground](https://play.rust-lang.org/?version=nightly&mode=debug&edition=2024&gist=a07d8a3ec0b31953942e96e2130476d9)):
<details><summary>Example 2</summary>
```rust
#![allow(unused)]
mod foo {
enum Never {}
struct PrivatelyUninhabited(Never);
pub enum A {
V(String, String),
Y(PrivatelyUninhabited),
}
fn works(mut x: A) {
let a = match x {
A::V(ref mut a, _) => a,
_ => unreachable!(),
};
let b = match x {
A::V(_, ref mut b) => b,
_ => unreachable!(),
};
a.len(); b.len();
}
fn fails(mut x: A) {
let mut f = || match x {
A::V(ref mut a, _) => (),
_ => unreachable!(),
};
let mut g = || match x {
A::V(_, ref mut b) => (),
_ => unreachable!(),
};
f(); g();
}
}
use foo::A;
fn fails(mut x: A) {
let a = match x {
A::V(ref mut a, _) => a,
_ => unreachable!(),
};
let b = match x {
A::V(_, ref mut b) => b,
_ => unreachable!(),
};
a.len(); b.len();
}
fn fails2(mut x: A) {
let mut f = || match x {
A::V(ref mut a, _) => (),
_ => unreachable!(),
};
let mut g = || match x {
A::V(_, ref mut b) => (),
_ => unreachable!(),
};
f(); g();
}
```
</details>
In light of the above, and following the discussion at rust-lang/rust#138961 and rust-lang/rust#147722, this PR ~~makes it so that, operationally, matching on an enum *always* reads its discriminant.~~ introduces the following changes to this behavior:
- matching on a `#[non_exhaustive]` enum will always introduce a discriminant read, regardless of whether the enum is from an external crate
- uninhabited variants now count just like normal ones, and don't get skipped in the checks
As per the discussion below, the resolution for point (1) above is that it should land as part of a separate PR, so that the subtler decision can be more carefully considered.
Note that this is a breaking change, due to the aforementioned changes in borrow checking behavior, new UB (or at least UB newly detected by miri), as well as drop order around closure captures. However, it seems to me that the combination of this PR with rust-lang/rust#138961 should have smaller real-world impact than rust-lang/rust#138961 by itself.
Fixesrust-lang/rust#142394Fixesrust-lang/rust#146590Fixesrust-lang/rust#146803 (though already marked as duplicate)
Fixes parts of rust-lang/rust#147722Fixesrust-lang/miri#4778
r? @Nadrieril @RalfJung
@rustbot label +A-closures +A-patterns +T-opsem +T-lang
rustdoc: more js cleanup
Continuing the effort of removing `@ts-expect-error` from the codebase wherever possible, this time focusing on `main.js`. Found some oddities with `register_type_impls`, fixed most of them, but the one that I couldn't figure out is what's going on with `sidebarTraitList`. It's queried, then if there are any trait imps, unconditionally overwritten, then latter code assumes that one of these two things has initialized it, but it's not obvious why this would be the case, or if there's a reason this wasn't done in a more straightforwards way.
r? @GuillaumeGomez
rustdoc: sort stable items first
Finally tackling this again now that the search system refactor is done. The tests and the general approach were taken from the original PR.
Rollup of 14 pull requests
Successful merges:
- rust-lang/rust#152323 (Fix ICE in borrowck when recovering `fn_sig` for `-> _`)
- rust-lang/rust#152469 (Remove unused features)
- rust-lang/rust#152515 (Extract `DepKindVTable` constructors to their own module)
- rust-lang/rust#152555 (Port `#[rustc_diagnostic_item]` to the new attribute parsers)
- rust-lang/rust#152218 (Report unconstrained region in hidden types lazily)
- rust-lang/rust#152356 (Improve the `inline_fluent!` macro)
- rust-lang/rust#152392 (Fix ICE in supertrait_vtable_slot when supertrait has missing generics)
- rust-lang/rust#152407 (Add regression test for type_const with unit struct ctor under mGCA)
- rust-lang/rust#152440 (Fix typos and grammar in compiler and build documentation)
- rust-lang/rust#152536 (bootstrap: add explicit UTF-8 encoding to text-mode open() calls)
- rust-lang/rust#152554 (Remove `deprecated_safe` and its corresponding feature gate)
- rust-lang/rust#152556 (doc: move riscv64a23-unknown-linux-gnu to tier 2)
- rust-lang/rust#152563 (Replace "bug" with "issue" in triagebot ping messages)
- rust-lang/rust#152565 (fix missleading error for tuple ctor)
Failed merges:
- rust-lang/rust#152512 (core: Implement feature `float_exact_integer_constants`)
- rust-lang/rust#152296 (Port `rust_nonnull_optimization_guaranteed` and `rustc_do_not_const_check` to the new attribute parser)
doc: move riscv64a23-unknown-linux-gnu to tier 2
This updates the platform support documentation to reflect that "riscv64a23-unknown-linux-gnu" is now Tier 2.
-Docs-only change (no compiler/runtime behavior change).
Fixesrust-lang/rust#152539
bootstrap: add explicit UTF-8 encoding to text-mode open() calls
Make text-mode `open()` calls in `bootstrap.py`
explicitly use `encoding="utf-8"`.
This avoids relying on platform-dependent default encodings
when running Python < 3.15.
Binary-mode opens remain unchanged.
Update cargo submodule
8 commits in 0c9e687d237ff04b53ccb67b4ce63e9483789e88..ce69df6f72a3b6a2b5c722ba68ddef255344b31c
2026-02-11 05:58:30 +0000 to 2026-02-12 12:39:45 +0000
- fix: apply `host.runner` only when `host-config` enabled (rust-lang/cargo#16631)
- fix(cli): Improve bad manifest error (rust-lang/cargo#16630)
- fix: Adjust casing of error message (rust-lang/cargo#16625)
- Enable triagebot new `[view-all-comments-link]` feature (rust-lang/cargo#16629)
- test(help): snapshot cargo help tests (rust-lang/cargo#16626)
- Suggest a `workspace.members` entry even from outside the workspace root (rust-lang/cargo#16616)
- Reorganize build unit directory layout for new build-dir layout (rust-lang/cargo#16542)
- Make the error messaging for `cargo install` aware of `build.build-dir` (rust-lang/cargo#16623)
The compiler is fixing a bug [1] that Rust for Linux happened to trigger,
thus temporarily add Benno's patch to the CI job.
As usual, the patch will eventually make it to the Linux kernel so that
both sides are good.
Cc: Benno Lossin <lossin@kernel.org>
Link: https://github.com/rust-lang/rust/pull/149389 [1]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Start using pattern types in libcore (NonZero and friends)
part of rust-lang/rust#136006
This PR only changes the internal representation of `NonZero`, `NonMax`, ... and other integral range types in libcore. This subsequently affects other types made up of it, but nothing really changes except that the field of `NonZero` is now accessible safely in contrast to the `rustc_layout_scalar_range_start` attribute, which has all kinds of obscure rules on how to properly access its field.
Correctly check if a macro call is actually a macro call in rustdoc highlighter
Fixesrust-lang/rust#151904.
Issues was that if there was a `!` following an ident, we would always assume it's a macro call... except it's very lacking. I'm actually surprised it went for so long unnoticed. To fix it, I added a check for the next (non-blank) token after the `!`, if it's a `{` or a `[` or a `(`, then only do we consider it to be a macro call.
r? @lolbinarycat
Jonathan Brouwer