Document `#![register_tool]` #138586

jyn514 · 2025-03-17T02:28:05Z

rustbot · 2025-03-17T02:28:09Z

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jyn514 · 2025-03-17T02:30:13Z

src/doc/unstable-book/src/language-features/register-tool.md

+
+`register_tool` also allows configuring lint levels for external tools.
+
+Tool attributes are only meant for ignorable attributes. If your code *changes* meaning when the attribute is present, it should not use a tool attribute (because it cannot be compiled with anything other than the external tool, and in a sense is a fork of the language).


this bit really belongs in an RFC, not here. i will try to make an RFC in the new few months.

jyn514 · 2025-03-17T02:33:35Z

src/doc/unstable-book/src/language-features/register-tool.md

+#![feature(register_tool)]
+#![register_tool(c2rust)]
+
+#[c2rust::header_src = "/home/user/some/workspace/foobar/bar.h:5"]
+pub mod bar_h {


@kkysen are you ok with me mentioning c2rust in the official docs here?

You can also just use some kind of stub tool name 🤷

Sure, I think so. @thedataking, this is fine, right?

You can also just use some kind of stub tool name 🤷

i think giving an example that shows how the attribute is useful is better than just shoving in foo/bar everywhere. motivating examples, and all that.

(of course it doesn't need to be c2rust specifically; i'm happy to find some other external tool if Per doesn't want it mentioned here.)

For what it's worth, I think it'd be very cool to mention c2rust here.

Sure, I think so. @thedataking, this is fine, right?

Definitely fine. Please go ahead @jyn514.

jyn514 · 2025-03-17T02:33:48Z

src/doc/unstable-book/src/language-features/register-tool.md

+#![feature(register_tool)]
+#![register_tool(bevy)]
+#![deny(bevy::duplicate_bevy_dependencies)]


i've already asked @alice-i-cecile about this example, she said mentioning bevy is fine.

Note that this lint / tool doesn't exist yet, but I think it's a very clear example of where this might be useful.

Note that this lint / tool doesn't exist yet, but I think it's a very clear example of where this might be useful.

This specific lint comes in the 0.2.0 release, but yea it's not an official bevy tool yet.

src/doc/unstable-book/src/language-features/register-tool.md

jieyouxu

Thanks, looks good. One tiny nit but r=me with or without.

src/doc/unstable-book/src/language-features/register-tool.md

alice-i-cecile

Good stuff; the c2rust section in particular is much clearer to me now.

jieyouxu · 2025-03-17T09:28:24Z

Thanks!
@bors r+ rollup

bors · 2025-03-17T09:28:26Z

📌 Commit 10bc5ac has been approved by jieyouxu

It is now in the queue for this repository.

Rollup of 9 pull requests Successful merges: - rust-lang#136355 (Add `*_value` methods to proc_macro lib) - rust-lang#137621 (Add std support to cygwin target) - rust-lang#137793 (Stablize anonymous pipe) - rust-lang#138341 (std: Mention clone-on-write mutation in Arc<T>) - rust-lang#138517 (Improve upvar analysis for deref of child capture) - rust-lang#138584 (Update Rust Foundation links in Readme) - rust-lang#138586 (Document `#![register_tool]`) - rust-lang#138590 (Flatten and simplify some control flow 🫓) - rust-lang#138592 (update change entry for rust-lang#137147) r? `@ghost` `@rustbot` modify labels: rollup

DaAlbrecht

Thank you so much for the mention of the bevy lint tool!

DaAlbrecht · 2025-03-17T13:07:50Z

src/doc/unstable-book/src/language-features/register-tool.md

+#![feature(register_tool)]
+#![register_tool(bevy)]
+#![deny(bevy::duplicate_bevy_dependencies)]


Note that this lint / tool doesn't exist yet, but I think it's a very clear example of where this might be useful.

This specific lint comes in the 0.2.0 release, but yea it's not an official bevy tool yet.

Rollup merge of rust-lang#138586 - jyn514:doc-register-tool, r=jieyouxu Document `#![register_tool]` cc rust-lang#66079

BD103 · 2025-03-17T21:18:19Z

Thanks for doing this, this is really cool! If you want any help writing the RFC, I'd be glad to assist, although it would be my first time. :)

jhpratt · 2025-03-18T03:53:29Z

still in the queue after being merged

@bors r-

jyn514 · 2025-03-18T06:42:00Z

@jhpratt this pr has not been merged ??

jhpratt · 2025-03-18T06:45:06Z

@jyn514 It was merged as part of #138595. It is present on master and is indicated as merged by GitHub in multiple places.

I noticed it when I created #138636 and saw that a number of PRs had already been merged.

jieyouxu · 2025-03-18T06:46:52Z

Yeah, bors sometimes has its own ideas...

jyn514 · 2025-03-18T06:47:59Z

oh lmao the github app was showing me a cached version of the pr, incredible

jhpratt · 2025-03-18T06:48:26Z

🤦

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Document #![register_tool]

10bc5ac

jyn514 force-pushed the doc-register-tool branch from e390be7 to 10bc5ac Compare March 17, 2025 05:16

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Rollup of 9 pull requests #138595

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bors merged commit 47d0c6b into rust-lang:master Mar 17, 2025
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Unrolled build for rust-lang#138586

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Rollup merge of rust-lang#138586 - jyn514:doc-register-tool, r=jieyouxu Document `#![register_tool]` cc rust-lang#66079

jieyouxu assigned jieyouxu and unassigned ehuss Mar 17, 2025

jyn514 deleted the doc-register-tool branch March 17, 2025 21:39

jhpratt mentioned this pull request Mar 18, 2025

Rollup of 12 pull requests #138636

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Release bevy_lint v0.2.0 TheBevyFlock/bevy_cli#308

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Enable internal rustc lints TheBevyFlock/bevy_cli#316

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Document `#![register_tool]` #138586

Document `#![register_tool]` #138586

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jhpratt commented Mar 18, 2025


		`register_tool` also allows configuring lint levels for external tools.

		Tool attributes are only meant for ignorable attributes. If your code changes meaning when the attribute is present, it should not use a tool attribute (because it cannot be compiled with anything other than the external tool, and in a sense is a fork of the language).

Document #![register_tool] #138586

Document #![register_tool] #138586

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Document `#![register_tool]` #138586

Document `#![register_tool]` #138586

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