Avoid serde dependency in build_helper when not necessary
Run-make-support doesn't need the metrics code to be pulled in ever. And bootstrap only needs it in CI where build metrics support is enabled.
rustc_target: Remove unused Arch::PowerPC64LE
This variant has been added in https://github.com/rust-lang/rust/pull/147645, but actually unused since target_arch for powerpc64le- targets is "powerpc64". (The difference between powerpc64- and powerpc64le- targets is identified by target_endian.)
Note: This is an internal cleanup and does NOT remove `powerpc64le-*` targets.
Remove `FeedConstTy` and provide ty when lowering const arg
r? @BoxyUwU
edit: BoxyUwU
`FeedConstTy` currently only provides the expected type of a const argument *sometimes* (e.g. previously array lengths did not do this). This causes problems with mGCA's directly represented const arguments which always need to know their expected type.
rustdoc: Fix intra-doc link bugs involving type aliases and associated items
This PR:
- Add support for linking to fields of variants behind a type alias.
- Correctly resolve links to fields and variants behind a type alias to the alias's version of the docs.
- Refactor some intra-doc links code to make it simpler.
- Add tests for the status quo of linking to associated items behind aliases.
Future steps:
- Nail down the rules of when inherent and trait impls are inlined into an alias's docs, and when impls on the alias appear for the aliased type.
- Adjust the resolutions of intra-doc links, through aliases, to associated items based on these rules.
r? @GuillaumeGomez
Rollup of 11 pull requests
Successful merges:
- rust-lang/rust#149408 (refactor: remove Ord bound from BinaryHeap::new etc)
- rust-lang/rust#150406 (Change some `matches!(.., .. if ..)` with let-chains)
- rust-lang/rust#150723 (std: move `errno` and related functions into `sys::io`)
- rust-lang/rust#150877 (resolve: Refactor away the side table `decl_parent_modules`)
- rust-lang/rust#150902 (Update to_uppercase docs to avoid ß->SS example)
- rust-lang/rust#151034 (std: Change UEFI env vars to volatile storage)
- rust-lang/rust#151036 (Better handle when trying to iterate on a `Range` of a type that isn't `Step`)
- rust-lang/rust#151067 (Avoid should-fail in two ui tests and a codegen-llvm test)
- rust-lang/rust#151072 (also handle ENOTTY ioctl errors when checking pidfd -> pid support)
- rust-lang/rust#151077 (Recognize potential `impl<const N: usize>` to `impl<N>` mistake)
- rust-lang/rust#151096 (Remove `Deref`/`DerefMut` impl for `Providers`.)
Failed merges:
- rust-lang/rust#150939 (resolve: Relax some asserts in glob overwriting and add tests)
r? @ghost
Remove `Deref`/`DerefMut` impl for `Providers`.
It's described as a "backwards compatibility hack to keep the diff small". Removing it requires only a modest amount of churn, and the resulting code is clearer without the invisible derefs.
r? @oli-obk
It's described as a "backwards compatibility hack to keep the diff
small". Removing it requires only a modest amount of churn, and the
resulting code is clearer without the invisible derefs.
Make `--print=check-cfg` output compatible `--check-cfg` arguments
This PR changes significantly the output of the unstable `--print=check-cfg` option.
Specifically it removes the ad-hoc resemblance with `--print=cfg` in order to output a simplified but still compatible `--check-cfg` arguments.
The goal is to future proof the output of `--print=check-cfg` like `--check-cfg` is, and the best way to do that is to use it's syntax.
This is particularly relevant for [RFC3905](https://github.com/rust-lang/rfcs/pull/3905) which wants to introduce a new predicate: `version(...)`.
Update books
## rust-lang/nomicon
2 commits in 5b3a9d084cbc64e54da87e3eec7c7faae0e48ba9..050c002a360fa45b701ea34feed7a860dc8a41bf
2026-01-10 15:05:01 UTC to 2026-01-09 23:34:23 UTC
- Correct false typo fix in safe-unsafe-meaning.md (rust-lang/nomicon#518)
- Fix grammar and typos in safe-unsafe-meaning.md (rust-lang/nomicon#517)
## rust-lang/reference
2 commits in 6363385ac4ebe1763f1e6fb2063c0b1db681a072..28b5a54419985f03db5294de5eede71b6665b594
2026-01-03 19:09:24 UTC to 2026-01-03 18:10:24 UTC
- RISC-V Extensions update including 29 extensions to stabilize (rust-lang/reference#1987)
- Update note about shebang removal in `include`d files (rust-lang/reference#2127)
## rust-lang/rust-by-example
1 commits in 2e02f22a10e7eeb758e6aba484f13d0f1988a3e5..8de6ff811315ac3a96ebe01d74057382e42ffdee
2026-01-06 00:16:33 UTC to 2026-01-06 00:16:33 UTC
- Update comments on iterator behavior in closure examples (rust-lang/rust-by-example#1983)
Improve span for "unresolved intra doc link" on `deprecated` attribute
Follow-up of rust-lang/rust#150721.
To make this work, I replaced the `Symbol` by an `Ident` to keep the `Span` information.
cc @folkertdev
r? @camelid
Dogfood `-Zno-embed-metadata` in the standard library
This PR dogfoods the [`-Zno-embed-metadata`](https://github.com/rust-lang/cargo/issues/15495) flag in the standard library. This removes the .rmeta portion out of the `libstd.so` file, thus reducing its filesize on disk. Notably, this reduces the amount of MiB that we ship to people who download the standard library.
I think that the only way to find out what this breaks is to try to run full CI, and then try to land it on nightly :)
r? @ghost
mGCA: Move tests for assoc const bindings (formerly ACE) into dedicated directory & replace more mentions of ACE
Split out of PR rust-lang/rust#150843.
As discussed.
Somewhat obvious underlying principle: If the test checks basic or core parts of assoc const bindings and nothing else, move it, otherwise leave it even if it contains ACEs.
Motivation: It makes a lot easier for me to continue working on ACE efficiently.
r? @BoxyUwU
