rust/compiler/rustc_builtin_macros/src, branch stable

remove rustc_attr_data_structures

2025-07-31T12:19:27+00:00

expand: Micro-optimize prelude injection

2025-07-28T14:35:09+00:00

Use `splice` to avoid shifting the other items twice. Put `extern crate std;` first so it's already resolved when we resolve `::std::prelude::rust_20XX`.

Use the new attributes throughout the codebase

2025-07-26T18:26:05+00:00

Signed-off-by: Jonathan Brouwer

Rollup merge of #143925 - oli-obk:slice-const-partialeq, r=fee1-dead

2025-07-18T12:49:19+00:00

Make slice comparisons const This needed a fix for `derive_const`, too, as it wasn't usable in libcore anymore as trait impls need const stability attributes. I think we can't use the same system as normal trait impls while `const_trait_impl` is still unstable. r? ```@fee1-dead``` cc rust-lang/rust#143800

Make `derive_const` usable within libcore again

2025-07-17T15:42:54+00:00

Also make it *only* usable on nightly

Improve path segment joining.

2025-07-16T22:37:19+00:00

There are many places that join path segments with `::` to produce a string. A lot of these use `join("::")`. Many in rustdoc use `join_with_double_colon`, and a few use `.joined("..")`. One in Clippy uses `itertools::join`. A couple of them look for `kw::PathRoot` in the first segment, which can be important. This commit introduces `rustc_ast::join_path_{syms,ident}` to do the joining for everyone. `rustc_ast` is as good a location for these as any, being the earliest-running of the several crates with a `Path` type. Two functions are needed because `Ident` printing is more complex than simple `Symbol` printing. The commit also removes `join_with_double_colon`, and `estimate_item_path_byte_length` with it. There are still a handful of places that join strings with "::" that are unchanged. They are not that important: some of them are in tests, and some of them first split a path around "::" and then rejoin with "::". This fixes one test case where `{{root}}` shows up in an error message.

Auto merge of #143958 - samueltardieu:rollup-lh1s143, r=samueltardieu

2025-07-15T11:42:55+00:00

Rollup of 13 pull requests Successful merges: - rust-lang/rust#142301 (tests: Fix duplicated-path-in-error fail with musl) - rust-lang/rust#143630 (Drop `./x suggest`) - rust-lang/rust#143736 (Give all bytes of TypeId provenance) - rust-lang/rust#143752 (Don't panic if WASI_SDK_PATH not set when detecting compiler) - rust-lang/rust#143837 (Adjust `run_make_support::symbols` helpers) - rust-lang/rust#143878 (Port `#[pointee]` to the new attribute parsing infrastructure) - rust-lang/rust#143905 (Recover and suggest to use `;` to construct array type) - rust-lang/rust#143907 (core: make `str::split_at_unchecked()` inline) - rust-lang/rust#143910 (Add experimental `backtrace-trace-only` std feature) - rust-lang/rust#143927 (Preserve constness in trait objects up to hir ty lowering) - rust-lang/rust#143935 (rustc_type_ir/walk: move docstring to `TypeWalker` itself) - rust-lang/rust#143938 (Update books) - rust-lang/rust#143941 (update `cfg_select!` documentation) Failed merges: - rust-lang/rust#143926 (Remove deprecated fields in bootstrap) r? `@ghost` `@rustbot` modify labels: rollup

Allow `Early` stage to emit errors

2025-07-15T07:01:03+00:00

update `cfg_select!` documentation

2025-07-14T20:29:28+00:00

and make internal terminology consistent Co-authored-by: Travis Cross

make `cfg_select` a builtin macro

2025-07-13T12:34:40+00:00