Remove redundant `#[rustc_paren_sugar]` feature gate by mejrs · Pull Request #159826 · rust-lang/rust

mejrs · 2026-07-24T10:22:48Z

It is already gated on rustc_attrs.

Alternatively we could update attribute parsing to optionally require multiple features, but that seems unnecessary.

rustbot · 2026-07-24T10:22:52Z

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JonathanBrouwer · 2026-07-24T12:34:47Z

You seem to have found a mistake in #157195

Before that PR, this attribute was only gated behind unboxed_closures.
I think it's best to return to that state, since it being gated behind two feature gates is weird

View changes since the review

I feel somewhat uncomfortable about a rustc_ attribute not being gated behind rustc_attrs 🤔, do we have any others that are like that? I think it's an important convention to have.

There's quite a few of them actually, just a random few examples

rustc_intrinsic is gated behind intrinsics

rustc_eii_foreign_item is gated behind eii_internals

rustc_allowed_through_unstable_modules is gated behind staged_api

rustc_default_body_unstable is gated behind staged_api

rustc_align is gated behind fn_align (tho this one is intended to stabilize)

This is what I could quickly find, there's a few more of them.

If we do choose rustc_attrs, is the unboxed_closures still useful as a feature then?

hmm not really, it just defuses this error:

/// When the code is using the `Fn` traits directly, instead of the `Fn(A) -> B` syntax, emit /// an error and attempt to build a reasonable structured suggestion.

looks like everything related is behind fn_traits

rustbot · 2026-07-24T12:34:55Z

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

rustbot · 2026-07-24T14:53:04Z

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann, @JonathanBrouwer

mejrs · 2026-07-24T14:53:57Z

Gate changed to unboxed_closures.

@rustbot ready

JonathanBrouwer

@bors r+ rollup

View changes since this review

rust-bors · 2026-07-24T15:05:45Z

📌 Commit 4bd52e9 has been approved by JonathanBrouwer

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 1. This pull request will be tested once the tree is reopened.

Reason for tree closure: spurious CI failures

@JonathanBrouwer

Remove redundant `#[rustc_paren_sugar]` feature gate It is already gated on `rustc_attrs`. Alternatively we could update attribute parsing to optionally require multiple features, but that seems unnecessary. r? @JonathanBrouwer

@JonathanBrouwer

Remove redundant `#[rustc_paren_sugar]` feature gate It is already gated on `rustc_attrs`. Alternatively we could update attribute parsing to optionally require multiple features, but that seems unnecessary. r? @JonathanBrouwer

Rollup of 17 pull requests Successful merges: - #158168 (Added implementation on `set_permissions_nofollow` for all primary platforms) - #138618 (Support using const pointers in asm `const` operand) - #157962 (Function item should not be used as const arg) - #158404 (trait_solver: normalize next-gen region constraints) - #158709 (rustdoc: warn on improperly interleaved HTML/MD) - #159720 (document #[global_allocator] constraints) - #159732 (optimization: don't look for diagnostic/canonical items without rustc_attrs enabled) - #159740 (reuse regular exported_non_generic_symbols logic in Miri) - #159780 (check `extern "custom"` function pointers) - #159786 (rustdoc-js: ignore editor temp files in test folder discovery) - #159819 (std::sync::poison: disable auto_cfg on PoisonError::new) - #155388 (stepping into where-clauses during normalization may be productive) - #155914 (when bailing on ambiguity, don't force other results to ambig) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159439 (Fix(lib/fs/win): Fall back on Win32 delete for `Dir::remove_file`) - #159809 (Avoid `#[target_features]`) - #159826 (Remove redundant `#[rustc_paren_sugar]` feature gate)

@JonathanBrouwer

Remove redundant `#[rustc_paren_sugar]` feature gate It is already gated on `rustc_attrs`. Alternatively we could update attribute parsing to optionally require multiple features, but that seems unnecessary. r? @JonathanBrouwer

Rollup of 16 pull requests Successful merges: - #138618 (Support using const pointers in asm `const` operand) - #157962 (Function item should not be used as const arg) - #158404 (trait_solver: normalize next-gen region constraints) - #158709 (rustdoc: warn on improperly interleaved HTML/MD) - #159720 (document #[global_allocator] constraints) - #159732 (optimization: don't look for diagnostic/canonical items without rustc_attrs enabled) - #159740 (reuse regular exported_non_generic_symbols logic in Miri) - #159780 (check `extern "custom"` function pointers) - #159786 (rustdoc-js: ignore editor temp files in test folder discovery) - #159819 (std::sync::poison: disable auto_cfg on PoisonError::new) - #155388 (stepping into where-clauses during normalization may be productive) - #155914 (when bailing on ambiguity, don't force other results to ambig) - #159411 ([rustdoc] Correctly handle output options with --show-coverage) - #159439 (Fix(lib/fs/win): Fall back on Win32 delete for `Dir::remove_file`) - #159809 (Avoid `#[target_features]`) - #159826 (Remove redundant `#[rustc_paren_sugar]` feature gate)

@JonathanBrouwer

Remove redundant `#[rustc_paren_sugar]` feature gate It is already gated on `rustc_attrs`. Alternatively we could update attribute parsing to optionally require multiple features, but that seems unnecessary. r? @JonathanBrouwer

@JonathanBrouwer

Remove redundant `#[rustc_paren_sugar]` feature gate It is already gated on `rustc_attrs`. Alternatively we could update attribute parsing to optionally require multiple features, but that seems unnecessary. r? @JonathanBrouwer

Rollup of 20 pull requests Successful merges: - #138618 (Support using const pointers in asm `const` operand) - #157962 (Lower paths to functions in const args as ConstKind::Error) - #158404 (trait_solver: normalize next-gen region constraints) - #158709 (rustdoc: warn on improperly interleaved HTML/MD) - #159720 (document #[global_allocator] constraints) - #159732 (optimization: don't look for diagnostic/canonical items without rustc_attrs enabled) - #159738 (implement `CovariantUnsafeCell`) - #159740 (reuse regular exported_non_generic_symbols logic in Miri) - #159780 (check `extern "custom"` function pointers) - #159786 (rustdoc-js: ignore editor temp files in test folder discovery) - #159819 (std::sync::poison: disable auto_cfg on PoisonError::new) - #155388 (stepping into where-clauses during normalization may be productive) - #155914 (when bailing on ambiguity, don't force other results to ambig) - #159439 (Fix(lib/fs/win): Fall back on Win32 delete for `Dir::remove_file`) - #159676 (Update wasm-component-ld to 0.5.27) - #159730 (allow accessing the contents of UnsafeCell without going through get) - #159809 (Avoid `#[target_features]`) - #159826 (Remove redundant `#[rustc_paren_sugar]` feature gate) - #159853 (Updated expect messages for `CString` struct and method documentation) - #159877 (Revert "Export `derive` at `core::derive` and `std::derive`")

rustbot assigned JonathanBrouwer Jul 24, 2026

rustbot added 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 Jul 24, 2026

JonathanBrouwer reviewed Jul 24, 2026

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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 Jul 24, 2026

Remove redundant #[rustc_paren_sugar] feature gate

4bd52e9

mejrs force-pushed the sugar_parens branch from 3d9babb to 4bd52e9 Compare July 24, 2026 14:53

rustbot added the A-attributes Area: Attributes (`#[…]`, `#![…]`) label Jul 24, 2026

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 Jul 24, 2026

JonathanBrouwer approved these changes Jul 24, 2026

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rust-bors Bot 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 Jul 24, 2026

jhpratt mentioned this pull request Jul 24, 2026

Rollup of 18 pull requests #159871

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jhpratt mentioned this pull request Jul 24, 2026

Rollup of 17 pull requests #159872

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jhpratt mentioned this pull request Jul 25, 2026

Rollup of 16 pull requests #159876

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Rollup of 19 pull requests #159879

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Rollup of 20 pull requests #159888

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Remove redundant `#[rustc_paren_sugar]` feature gate#159826

Remove redundant `#[rustc_paren_sugar]` feature gate#159826
mejrs wants to merge 1 commit into
rust-lang:mainfrom
mejrs:sugar_parens

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