Add `Box::clone_from_ref` and similar under `feature(clone_from_ref)`
Tracking issue: https://github.com/rust-lang/rust/issues/149075
Accepted ACP: https://github.com/rust-lang/libs-team/issues/483
This PR implements `clone_from_ref` (and `try_*` and `_*in` variants), to get a `Box<T>`, `Arc<T>`, or `Rc<T>` by cloning from a `&T` where `T: CloneToUninit`.
The "Implement..." commits replace some ad-hoc conversions with `clone_from_ref` variants, which can be split out to a separate PR if desired.
This PR will conflict with https://github.com/rust-lang/rust/pull/148769 due to usage of `Layout::dangling` (which that PR is renaming to `dangling_ptr`), so they should not be rolled up together, and the one which merges later will need to be amended.
Deny const auto traits
closerust-lang/rust#149285
The AST validation now detects and rejects const auto traits. Additionally, I updated an existing test that was using `const unsafe auto trait`.
r? fmease
[rustdoc] misc search index cleanups
Bunch of misc cleanups to search index generation (on the rustdoc side). Perf isn't improved unfortunately, but I do think most of these changes are improvements to readability/style.
Probably easier to review commit by commit.
Mangle symbols with a mangled name close to PDB limits with v0 instead of legacy mangling to avoid linker errors
This is rust-lang/compiler-team#934
As PDB debuginfo has a 64KiB limit for symbol names, we use v0 mangling instead of legacy mangling for symbol names >= 65000 bytes if PDB is used. The cutoff number was chosen to leave some room for potential errors in the empirical measurement of the limit of 65521 bytes, as well as potential symbol prefixes and suffixes that are applied later, plus some generous extra space.
Tracking issue: rust-lang/rust#148429
Fix some issues around `rustc_public`
cc rust-lang/rust#148266 .
follow-up of rust-lang/rust#148341 .
This fixes the issues that can be reproduced by `x test compiler/rustc_public`:
```
error: function `run` is never used
--> compiler/rustc_public/src/compiler_interface.rs:838:15
|
838 | pub(crate) fn run<'tcx, F, T>(interface: &CompilerInterface<'tcx>, f: F) -> Result<T, Error>
| ^^^
|
= note: `-D dead-code` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(dead_code)]`
error: unreachable `pub` item
--> compiler/rustc_public/src/unstable/mod.rs:25:1
|
25 | pub trait InternalCx<'tcx>: Copy + Clone {
| ---^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: consider restricting its visibility: `pub(crate)`
|
= help: or consider exporting it for use by other crates
= note: `-D unreachable-pub` implied by `-D warnings`
= help: to override `-D warnings` add `#[allow(unreachable_pub)]`
error: unreachable `pub` item
--> compiler/rustc_public/src/unstable/mod.rs:62:1
|
62 | pub trait Stable<'tcx>: PointeeSized {
| ---^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
| |
| help: consider restricting its visibility: `pub(crate)`
|
= help: or consider exporting it for use by other crates
error: unreachable `pub` item
--> compiler/rustc_public/src/unstable/mod.rs:81:1
|
81 | pub trait RustcInternal {
| ---^^^^^^^^^^^^^^^^^^^^
| |
| help: consider restricting its visibility: `pub(crate)`
|
= help: or consider exporting it for use by other crates
error: could not compile `rustc_public` (lib) due to 4 previous errors
```
Update cargo submodule
7 commits in 9fa462fe3a81e07e0bfdcc75c29d312c55113ebb..2a7c4960677971f88458b0f8b461a866836dff59
2025-11-21 20:49:51 +0000 to 2025-11-25 19:58:07 +0000
- docs(config-include): prepare for doc stabilization (rust-lang/cargo#16301)
- fix(config-include): remove support of single string shorthand (rust-lang/cargo#16298)
- Revert "feat: Do not lock the artifact-dir for check builds" (rust-lang/cargo#16299)
- clean: Add --workspace support (rust-lang/cargo#16263)
- feat(tree): Add more native completions (rust-lang/cargo#16296)
- fix(package): exclude target/package from backups (rust-lang/cargo#16272)
- test: re-enable test since not flaky anymore (rust-lang/cargo#16287)
Lukas Wirth