fix: avoid double_must_use in macro-generated code by saberoueslati · Pull Request #17547 · rust-lang/rust-clippy

saberoueslati · 2026-08-11T22:57:13Z

double_must_use and must_use_unit now ignore #[must_use] attributes generated by macro expansion, while continuing to lint user-written attributes passed through procedural macros.

changelog: [double_must_use]: Fixed false positives from macro-generated #[must_use] attributes.

rustbot · 2026-08-11T22:57:17Z

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blyxyas

Just a bit of a nit to make the new auxiliary function more robust, everything else is looking great!

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rustbot · 2026-08-13T10:15:50Z

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

saberoueslati · 2026-08-18T01:00:13Z

@rustbot ready

blyxyas

LGTM, thanks for addressing this issue! ❤️ ฅ•ω•ฅ

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saberoueslati · 2026-08-19T20:52:41Z

@blyxyas should I correct the CI issue that stopped the merge ?

blyxyas · 2026-08-19T21:22:02Z

@blyxyas should I correct the CI issue that stopped the merge ?

It was a spurious network issue. We'll re-try

cschramm · 2026-09-03T11:34:01Z

@rustbot label +beta-nominated

blyxyas · 2026-09-03T19:21:21Z

@cschramm what's the reason for the beta nomination? Are you encountering a specially-awful occurrence of this bug?
(ㅇㅅㅇ❀)

cschramm · 2026-09-03T21:40:57Z

It depends on what you consider especially awful, but for any code base with reasonable usage of e.g. async-trait and double_must_use on deny (-D clippy::all in my case), it means that 1.99.0 will come with a regression. You'll be forced to either weaken your checks or to ban 1.99.0 from your toolchain.

cschramm · 2026-09-21T10:15:13Z

@rustbot label -beta-nominated

Disregard. async-trait already resolved this in 0.1.92, released 2026-08-08 and I'm not aware of other such popular crates that are affected.

## Why CI selected the floating `stable` channel. When stable moved from 1.98.1 to 1.99.0, `cargo clippy ... -D warnings` started failing on unchanged `main` with `clippy::double_must_use` on the `#[async_trait]` expansion of `ExecutionOwnership` (`src-tauri/src/lifecycle.rs`). That is a Clippy false positive on macro-generated code (rust-lang/rust-clippy#17529), fixed by rust-lang/rust-clippy#17547 and present in 1.100 beta/nightly, but not in any stable release yet. ## What - Add `rust-toolchain.toml` (channel `1.98.1`, profile `minimal`) as the only place the Rust version is declared. rustup applies it to every `cargo`/`rustc` run in a checkout: local, agent workspaces, CI and release. - Replace the five `dtolnay/rust-toolchain` uses in `ci.yml` and `release.yml` with `rustup toolchain install --no-self-update`, run after checkout so the file is honored. No version literal in the workflows. - Components and targets stay job-specific: `clippy` in the lint job, `wasm32-unknown-unknown` where `trunk build` runs, the macOS release targets on macOS only. - Docs: Rust is pinned by `rust-toolchain.toml`; developers add `clippy`/`rustfmt` themselves. ## Behavior of the removed action - `CARGO_INCREMENTAL=0`: still set by `Swatinem/rust-cache` in every job that uses it; release builds are not incremental. - `rustup default`, `CARGO_HOME`, rustup bootstrap, sparse-registry and curl workarounds: unnecessary on current runners (rustup 1.29.x preinstalled on ubuntu-22.04, Windows 2025 and macOS 26). - `CARGO_TERM_COLOR=always`: cosmetic only, dropped. ## Not in this PR No `rust-version` in `Cargo.toml` (this is a toolchain pin, not an MSRV), no `#[allow(clippy::double_must_use)]`, no move to 1.99. A later bump should target the first stable release containing the Clippy fix and address its new warnings (1.100 beta reports four unused-dependency warnings). ## Validation With Rust 1.98.1 selected only by the file: the exact CI Clippy command, the acceptance-harness Clippy command and the CI test commands pass. Rust 1.99.0 fails the Clippy command on unchanged `main`; 1.98.1 passes.

fix: avoid double_must_use in macro-generated code

b34942c

rustbot added S-waiting-on-community-reviews Status: This is awaiting for positive reviews from the community before a maintainer is assigned. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties labels Aug 11, 2026

blyxyas requested changes Aug 13, 2026

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Comment thread tests/ui/auxiliary/proc_macro_attr.rs

rustbot added S-waiting-on-author Status: This is awaiting some action from the author. (Use `@rustbot ready` to update this status) and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties labels Aug 13, 2026

addressed review comment

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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 from the author. (Use `@rustbot ready` to update this status) labels Aug 18, 2026

saberoueslati requested a review from blyxyas August 18, 2026 01:00

blyxyas approved these changes Aug 19, 2026

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blyxyas added this pull request to the merge queue Aug 19, 2026

github-merge-queue Bot removed this pull request from the merge queue due to failed status checks Aug 19, 2026

blyxyas added this pull request to the merge queue Aug 19, 2026

Merged via the queue into rust-lang:master with commit bdce5b9 Aug 19, 2026
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rustbot removed S-waiting-on-community-reviews Status: This is awaiting for positive reviews from the community before a maintainer is assigned. S-waiting-on-review Status: Awaiting review from the assignee but also interested parties labels Aug 19, 2026

rustbot mentioned this pull request Aug 19, 2026

Add must_use_without_reason lint #16592

Merged

rustbot added the beta-nominated Nominated for backporting to the compiler in the beta channel. label Sep 3, 2026

27Bslash6 mentioned this pull request Sep 12, 2026

ci(security): tamper-evidence for deny.toml and security.yml (LAB-1151) cachekit-io/cachekit-rs#68

Merged

rustbot removed the beta-nominated Nominated for backporting to the compiler in the beta channel. label Sep 21, 2026

linus-mullvad mentioned this pull request Sep 22, 2026

Stop running nightly+beta Rust CI on push, instead on a schedule mullvad/mullvadvpn-app#11197

Open

lonless9 mentioned this pull request Sep 30, 2026

chore: clippy 1.99.0 warnings lakehq/sail#2697

Closed

basvandijk mentioned this pull request Oct 1, 2026

chore: cargo clippy fixes to prepare for the rustc upgrade: 1.98.1 -> 1.99.0 dfinity/ic#11734

Merged

shingonoide mentioned this pull request Oct 1, 2026

ci: pin the repository Rust toolchain BarraDev/slashit#108

Merged

Jimthetaxguy mentioned this pull request Oct 2, 2026

Fix current Clippy gate and macOS readiness HTTP regression Jimthetaxguy/neurobrowser#106

Merged

majiayu000 mentioned this pull request Oct 2, 2026

docs: clarify Sage task workflows and repair guide navigation majiayu000/sage#174

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graelo mentioned this pull request Oct 3, 2026

refactor(lsp)!: migrate from tower-lsp to tower-lsp-server 0.23 graelo/gcode-language-server#75

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gopikrishna000 mentioned this pull request Oct 5, 2026

fix(ci): resolve Rust 1.99 workspace clippy failures juspay/hyperswitch-prism#2436

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fix: avoid double_must_use in macro-generated code - #17547

fix: avoid double_must_use in macro-generated code#17547
blyxyas merged 2 commits into
rust-lang:masterfrom
saberoueslati:fix/double-must-use-macro-expansion

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