Inherit `#[stable(..)]` annotations in enum variants and fields from its item #71481

estebank · 2020-04-23T18:20:34Z

Lint changes for #65515. The stdlib will have to be updated once this lands in beta and that version is promoted in master.

rust-highfive · 2020-04-23T18:20:37Z

r? @matthewjasper

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estebank · 2020-05-07T18:20:54Z

CC @rust-lang/compiler who might be interested in this.

petrochenkov · 2020-05-07T18:29:13Z

I still don't think this is a good idea.

petrochenkov · 2020-05-07T18:39:34Z

Items in trait impls don't currently require stability attributes.
This PR at least should use the same mechanism.

estebank · 2020-05-07T19:23:51Z

I still don't think this is a good idea.

Does this refer to this implementation, the general idea of stability stable attributes flowing down in general or the specific case of them flowing down from ADTs to their variants and fields?

From the first diff section in https://github.com/rust-lang/rust/pull/71481/files#diff-6bfe08b41853465a10867dc22a4a548c it seems to me that we originally intended this new behavior to be the correct one.

It's also making me realize that after landing this when we update the used beta in this repo we'll also need to in the same commit update the current usages, as having two different nested stable attributes with the same value in the feature field is denied by this PR (in currently existing code) and would require a more significant change.

Items in trait impls don't currently require stability attributes.
This PR at least should use the same mechanism.

The mechanism used for impls is a visitor boolean field. This PR adds an argument and can be changed to be a field, but I find using fields tracking current state harder to follow, at least when trying things out first. It should be easy to change it to use a field if necessary.

nagisa · 2020-06-06T12:44:08Z

src/test/ui/stability-attribute/stability-attribute-issue-43027.rs

 #![feature(staged_api)]
 #![stable(feature = "test", since = "0")]

 #[stable(feature = "test", since = "0")]
-pub struct Reverse<T>(pub T); //~ ERROR field has missing stability attribute
+pub struct Reverse<T>(pub T);


I feel like this is potentially dangerous change that also limits our options in the future.

I can see an use-case in adding an unstable new field to a struct and not impacting any stable uses of the struct.

Similarly for #[non_exhaustive] enums (the only kind of enum to which it is valid to add a variant), though perhaps significantly more debatable depending on the specific case.

I can see an use-case in adding an unstable new field to a struct and not impacting any stable uses of the struct.

I'm not sure I follow. This PR makes the linked code semantically the same as the current

#[stable(feature = "test", since = "0")] pub struct Reverse<T>(#[stable(feature = "test", since = "0")] pub T);

but you can still add unstable (and stable with different feature name) annotations to individual fields as you add to them. You currently get a compile error with the presented code. I don't see how this change limits us?

I guess the point is more that we might accidentally stabilize struct fields without intending to?

Yeah, the reason this comment ended up being here is because I’m expressing my observation based on the removed error message, not because the struct is in any way interesting.

@nikomatsakis summarized my point well.

Dylan-DPC-zz · 2020-06-30T08:28:45Z

@matthewjasper any updates on this?

nikomatsakis · 2020-06-30T17:49:29Z

I'm nominating to discuss in a triage meeting and decide next steps here.

spastorino · 2020-07-02T17:39:12Z

Removed I-nominated by mistake and re-added it again, we didn't have time to discuss this issue during this week triage meeting. So keeping it nominated for the next one.

spastorino · 2020-07-09T14:39:44Z

This was discussed in today's weekly meeting. Removing nomination.

bors · 2021-03-03T04:28:44Z

💥 Test timed out

rust-log-analyzer · 2021-03-03T05:48:29Z

A job failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

estebank · 2021-03-03T23:14:39Z

@bors retry

…atsakis Inherit `#[stable(..)]` annotations in enum variants and fields from its item Lint changes for rust-lang#65515. The stdlib will have to be updated once this lands in beta and that version is promoted in master.

bors · 2021-03-04T04:11:12Z

⌛ Testing commit 49310ce with merge d81b0db9e9fc6a3ecbf3d00f9652e8c33aa953d7...

rust-log-analyzer · 2021-03-04T04:26:27Z

The job mingw-check failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

Removing intermediate container befbf413490f
 ---> 0862050eff83
Step 5/10 : RUN npm install es-check -g
 ---> Running in 019c2ce940b3
/node-v14.4.0-linux-x64/bin/es-check -> /node-v14.4.0-linux-x64/lib/node_modules/es-check/index.js

> spawn-sync@1.0.15 postinstall /node-v14.4.0-linux-x64/lib/node_modules/es-check/node_modules/spawn-sync
> node postinstall
+ es-check@5.2.1
added 95 packages from 44 contributors in 3.844s
Removing intermediate container 019c2ce940b3
 ---> 85daf0875536
---
Cloning into 'rust-toolstate'...
<Nothing changed>
+ es-check es5 ../src/librustdoc/html/static/main.js ../src/librustdoc/html/static/settings.js ../src/librustdoc/html/static/source-script.js ../src/librustdoc/html/static/storage.js

Cannot read property 'includes' of undefined

bors · 2021-03-04T04:28:59Z

💔 Test failed - checks-actions

JohnTitor · 2021-03-04T06:44:18Z

Unrelated CI failure, @bors retry

…atsakis Inherit `#[stable(..)]` annotations in enum variants and fields from its item Lint changes for rust-lang#65515. The stdlib will have to be updated once this lands in beta and that version is promoted in master.

bors · 2021-03-05T05:28:11Z

⌛ Testing commit 49310ce with merge a0d66b5...

bors · 2021-03-05T08:32:57Z

☀️ Test successful - checks-actions
Approved by: nikomatsakis
Pushing a0d66b5 to master...

…stab, r=estebank Enum variant ctor inherits the stability of the enum variant Fixes rust-lang#100399 Fixes rust-lang#100420 Context rust-lang#71481 for why enum variants don't need stability

rust-highfive assigned matthewjasper Apr 23, 2020

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estebank mentioned this pull request Apr 23, 2020

Remove inherited #[stable(..)] annotations #71482

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estebank mentioned this pull request May 5, 2020

Reduce the places where stable annotations are needed #65515

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Dylan-DPC-zz mentioned this pull request Mar 4, 2021

Rollup of 11 pull requests #82737

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Rollup of 9 pull requests #82785

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camelid mentioned this pull request Jul 23, 2021

Error on private items with stability attributes #83397

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compiler-errors mentioned this pull request Aug 11, 2022

Enum variant ctor inherits the stability of the enum variant #100431

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Inherit `#[stable(..)]` annotations in enum variants and fields from its item #71481

Inherit `#[stable(..)]` annotations in enum variants and fields from its item #71481

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Inherit #[stable(..)] annotations in enum variants and fields from its item #71481

Inherit #[stable(..)] annotations in enum variants and fields from its item #71481

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Inherit `#[stable(..)]` annotations in enum variants and fields from its item #71481

Inherit `#[stable(..)]` annotations in enum variants and fields from its item #71481

estebank commented May 7, 2020 •

edited