rust/library/std/src/prelude, branch auto

Make `derive_const` usable within libcore again

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

Also make it *only* usable on nightly

Remove the deprecated `concat_idents!` macro

2025-06-24T11:07:16+00:00

In [137653], the lang and libs-API teams did a joint FCP to deprecate and eventually remove the long-unstable `concat_idents!` macro. The deprecation is landing in 1.88, so do the removal here (target version 1.90). This macro has been superseded by the more recent `${concat(...)}` metavariable expression language feature, which avoids some of the limitations of `concat_idents!`. The metavar expression is unstably available under the [`macro_metavar_expr_concat`] feature. History is mildly interesting here: `concat_idents!` goes back to 2011 when it was introduced with 513276e595f8 ("Add #concat_idents[] and about the same: let asdf_fdsa = "<.<"; assert(#concat_idents[asd,f_f,dsa] == "<.<"); assert(#ident_to_str[use_mention_distinction] == "use_mention_distinction"); (That test existed from introduction until its removal here.) Closes: https://www.github.com/rust-lang/rust/issues/29599 [137653]: https://www.github.com/rust-lang/rust/pull/137653 [`macro_metavar_expr_concat`]: https://www.github.com/rust-lang/rust/issues/124225

update cfg(bootstrap)

2025-05-12T13:33:37+00:00

Deprecate the unstable `concat_idents!`

2025-04-24T22:14:23+00:00

`concat_idents` has been around unstably for a long time, but there is now a better (but still unstable) way to join identifiers using `${concat(...)}` syntax with `macro_metavar_expr_concat`. This resolves a lot of the problems with `concat_idents` and is on a better track toward stabilization, so there is no need to keep both versions around. `concat_idents!` still has a lot of use in the ecosystem so deprecate it before removing, as discussed in [1]. Link: https://github.com/rust-lang/rust/issues/124225 [1]: https://rust-lang.zulipchat.com/#narrow/channel/219381-t-libs/topic/Removing.20.60concat_idents.60

update cfgs

2025-04-09T11:29:59+00:00

Implement `#[define_opaque]` attribute for functions.

2025-03-11T12:05:02+00:00

span: add a "future" edition

2025-02-24T14:35:30+00:00

It's hard to implement edition migrations without having a perma-unstable "future" edition to target.

Remove the common prelude module

2025-02-11T21:04:27+00:00

This fixes the issues described in https://github.com/rust-lang/rust/issues/136102. Primarily, this resolves some issues with how the documentation for the prelude is generated: - It avoids showing "unstable" for macros in the prelude that are actually stable. - Avoids duplication of some pages due to the previous lack of `doc(no_inline)`. - Makes the different edition preludes consistent, and sets a pattern that can be used by future editions. We may need to rearrange these modules in the future if we decide to remove anything from the prelude again. If we do, I think we should look into a different solution that avoids the documentation problems.

remove Rustc{En,De}codable from library and compiler

2025-01-14T15:16:38+00:00

make rustc_encodable_decodable feature properly unstable

2025-01-14T15:16:38+00:00