Port `cfg_select!` to the new attribute parsing system by JonathanBrouwer · Pull Request #148712 · rust-lang/rust

JonathanBrouwer · 2025-11-08T20:45:44Z

Best reviewed commit by commit, since it involves some moving around of code

r? @jdonszelmann

rustbot · 2025-11-08T20:45:47Z

Some changes occurred in compiler/rustc_hir/src/attrs

cc @jdonszelmann

rustbot · 2025-11-08T20:45:50Z

jdonszelmann is currently at their maximum review capacity.
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compiler/rustc_parse/src/parser/cfg_select.rs

JonathanBrouwer · 2025-11-09T12:33:44Z

@rustbot author
Need to address Folkert's comment

rustbot · 2025-11-09T12:33:48Z

Reminder, once the PR becomes ready for a review, use @rustbot ready.

rustbot · 2025-11-09T14:51:55Z

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann

JonathanBrouwer · 2025-11-09T14:52:49Z

@rustbot ready
Made the changes so this code is usable from rustfmt. I believe you should be able to call parse_cfg_select.

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

rustbot · 2025-11-09T15:11:25Z

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

jdonszelmann · 2025-11-10T10:14:13Z

compiler/rustc_attr_parsing/src/attributes/cfg_select.rs

+) -> Result<CfgSelectBranches, ErrorGuaranteed> {
+    let mut branches = CfgSelectBranches::default();
+
+    while p.token != token::Eof {


this makes me so sad but for now we'll have to...

jdonszelmann · 2025-11-10T10:41:56Z

@bors r+ rollup

bors · 2025-11-10T10:41:59Z

📌 Commit 90f36af has been approved by jdonszelmann

It is now in the queue for this repository.

bors · 2025-11-10T10:42:00Z

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

…szelmann Port `cfg_select!` to the new attribute parsing system Best reviewed commit by commit, since it involves some moving around of code r? ``@jdonszelmann``

…szelmann Port `cfg_select!` to the new attribute parsing system Best reviewed commit by commit, since it involves some moving around of code r? ```@jdonszelmann```

Rollup of 9 pull requests Successful merges: - #148480 (Add `Steal::risky_hack_borrow_mut`) - #148608 (Add test for --test-builder success path) - #148667 (a few small clippy fixes) - #148712 (Port `cfg_select!` to the new attribute parsing system) - #148760 (rustc_target: hide TargetOptions::vendor) - #148775 (Fix a typo in the documentation for the strict_shr function) - #148779 (Implement DynSend and DynSync for std::panic::Location.) - #148781 ([rustdoc] Remove unneeded `allow(rustc::potential_query_instability)`) - #148791 (fix "is_closure_like" doc comment) r? `@ghost` `@rustbot` modify labels: rollup

…szelmann Port `cfg_select!` to the new attribute parsing system Best reviewed commit by commit, since it involves some moving around of code r? ````@jdonszelmann````

Rollup of 13 pull requests Successful merges: - #148694 (std: support `RwLock` and thread parking on TEEOS) - #148712 (Port `cfg_select!` to the new attribute parsing system) - #148760 (rustc_target: hide TargetOptions::vendor) - #148771 (IAT: Reinstate early bailout) - #148775 (Fix a typo in the documentation for the strict_shr function) - #148779 (Implement DynSend and DynSync for std::panic::Location.) - #148781 ([rustdoc] Remove unneeded `allow(rustc::potential_query_instability)`) - #148783 (add test for assoc type norm wf check) - #148785 (Replace `master` branch references with `main`) - #148791 (fix "is_closure_like" doc comment) - #148792 (Prefer to use file.stable_id over file.name from source map) - #148805 (rustc-dev-guide subtree update) - #148807 (Document (and test) a problem with `Clone`/`Copy` deriving.) r? `@ghost` `@rustbot` modify labels: rollup

Rollup merge of #148712 - JonathanBrouwer:cfg_select, r=jdonszelmann Port `cfg_select!` to the new attribute parsing system Best reviewed commit by commit, since it involves some moving around of code r? `````@jdonszelmann`````

Rollup of 13 pull requests Successful merges: - rust-lang/rust#148694 (std: support `RwLock` and thread parking on TEEOS) - rust-lang/rust#148712 (Port `cfg_select!` to the new attribute parsing system) - rust-lang/rust#148760 (rustc_target: hide TargetOptions::vendor) - rust-lang/rust#148771 (IAT: Reinstate early bailout) - rust-lang/rust#148775 (Fix a typo in the documentation for the strict_shr function) - rust-lang/rust#148779 (Implement DynSend and DynSync for std::panic::Location.) - rust-lang/rust#148781 ([rustdoc] Remove unneeded `allow(rustc::potential_query_instability)`) - rust-lang/rust#148783 (add test for assoc type norm wf check) - rust-lang/rust#148785 (Replace `master` branch references with `main`) - rust-lang/rust#148791 (fix "is_closure_like" doc comment) - rust-lang/rust#148792 (Prefer to use file.stable_id over file.name from source map) - rust-lang/rust#148805 (rustc-dev-guide subtree update) - rust-lang/rust#148807 (Document (and test) a problem with `Clone`/`Copy` deriving.) r? `@ghost` `@rustbot` modify labels: rollup

Rollup of 13 pull requests Successful merges: - rust-lang#148694 (std: support `RwLock` and thread parking on TEEOS) - rust-lang#148712 (Port `cfg_select!` to the new attribute parsing system) - rust-lang#148760 (rustc_target: hide TargetOptions::vendor) - rust-lang#148771 (IAT: Reinstate early bailout) - rust-lang#148775 (Fix a typo in the documentation for the strict_shr function) - rust-lang#148779 (Implement DynSend and DynSync for std::panic::Location.) - rust-lang#148781 ([rustdoc] Remove unneeded `allow(rustc::potential_query_instability)`) - rust-lang#148783 (add test for assoc type norm wf check) - rust-lang#148785 (Replace `master` branch references with `main`) - rust-lang#148791 (fix "is_closure_like" doc comment) - rust-lang#148792 (Prefer to use file.stable_id over file.name from source map) - rust-lang#148805 (rustc-dev-guide subtree update) - rust-lang#148807 (Document (and test) a problem with `Clone`/`Copy` deriving.) r? `@ghost` `@rustbot` modify labels: rollup

Rollup of 13 pull requests Successful merges: - rust-lang/rust#148694 (std: support `RwLock` and thread parking on TEEOS) - rust-lang/rust#148712 (Port `cfg_select!` to the new attribute parsing system) - rust-lang/rust#148760 (rustc_target: hide TargetOptions::vendor) - rust-lang/rust#148771 (IAT: Reinstate early bailout) - rust-lang/rust#148775 (Fix a typo in the documentation for the strict_shr function) - rust-lang/rust#148779 (Implement DynSend and DynSync for std::panic::Location.) - rust-lang/rust#148781 ([rustdoc] Remove unneeded `allow(rustc::potential_query_instability)`) - rust-lang/rust#148783 (add test for assoc type norm wf check) - rust-lang/rust#148785 (Replace `master` branch references with `main`) - rust-lang/rust#148791 (fix "is_closure_like" doc comment) - rust-lang/rust#148792 (Prefer to use file.stable_id over file.name from source map) - rust-lang/rust#148805 (rustc-dev-guide subtree update) - rust-lang/rust#148807 (Document (and test) a problem with `Clone`/`Copy` deriving.) r? `@ghost` `@rustbot` modify labels: rollup

rustbot added A-attributes Area: Attributes (`#[…]`, `#![…]`) S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Nov 8, 2025

rustbot assigned jdonszelmann Nov 8, 2025

folkertdev reviewed Nov 9, 2025

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rustbot added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Nov 9, 2025

JonathanBrouwer force-pushed the cfg_select branch from 1125b68 to cf6d5c1 Compare November 9, 2025 14:51

rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Nov 9, 2025

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JonathanBrouwer added 3 commits November 9, 2025 16:08

Move parse_cfg_select to rustc_builtin_macros

a5814a5

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

Add more tests for cfg_select parsing

c111ccc

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

Port cfg_select! to the new attribute parsing system

90f36af

Signed-off-by: Jonathan Brouwer <jonathantbrouwer@gmail.com>

JonathanBrouwer force-pushed the cfg_select branch from cf6d5c1 to 90f36af Compare November 9, 2025 15:11

jdonszelmann reviewed Nov 10, 2025

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bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Nov 10, 2025

ChrisDenton mentioned this pull request Nov 10, 2025

Rollup of 14 pull requests #148800

Closed

JonathanBrouwer mentioned this pull request Nov 10, 2025

Handle macro invocation in attribute during parse #146579

Merged

ChrisDenton mentioned this pull request Nov 10, 2025

Rollup of 9 pull requests #148802

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Zalathar mentioned this pull request Nov 11, 2025

Rollup of 13 pull requests #148818

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bors merged commit e26b423 into rust-lang:main Nov 11, 2025
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rustbot added this to the 1.93.0 milestone Nov 11, 2025

JonathanBrouwer mentioned this pull request Nov 19, 2025

cfg_select should check for unexpected_cfgs on other arms #149090

Closed

folkertdev added the F-cfg_select `#![feature(cfg_select)]` label Dec 8, 2025

folkertdev mentioned this pull request Dec 8, 2025

stabilize cfg_select! #149783

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