On stable, suggest removing `#![feature]` for features that have been stabilized #83722

jyn514 · 2021-03-31T20:30:56Z

I don't know how to test this (https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Run.20tests.20without.20enabling.20nightly.20features.3F). I confirmed locally that this gives the
appropriate help with channel = "beta":

error[E0554]: `#![feature]` may not be used on the beta release channel
 --> src/lib.rs:2:1
  |
2 | #![feature(min_const_generics)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
  |
  = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable

error[E0554]: `#![feature]` may not be used on the beta release channel
 --> src/lib.rs:3:1
  |
3 | #![feature(min_const_generics, min_specialization)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  |
  = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable

error[E0554]: `#![feature]` may not be used on the beta release channel
 --> src/lib.rs:4:1
  |
4 | #![feature(box_patterns)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^

Closes #83715.

rust-highfive · 2021-03-31T20:30:59Z

r? @estebank

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GuillaumeGomez · 2021-04-01T15:06:11Z

I think it shouldn't make this check only on stable. If you are using a feature in nightly which is now stable, I think it's definitely worth it to show a warning there as well (and this case is simpler to test too 😉 ).

jyn514 · 2021-04-01T15:45:37Z

@GuillaumeGomez it already warns on nightly. It's a lint and feature gates are rejected during parsing, which is why it doesn't already show up. That's the main reason I wanted to add a test, because I think whoever added the lint originally expected it to work on all channels.

GuillaumeGomez · 2021-04-01T15:47:24Z

Oh I see, my bad, I misunderstood the context from your comment.

joshtriplett · 2021-04-02T22:40:55Z

@jyn514 This seems like a great idea.

Would it be possible to also provide a rustfix suggestion that deletes the line?

jyn514 · 2021-04-02T22:52:19Z

Would it be possible to also provide a rustfix suggestion that deletes the line?

Hmm, I could only do that if all features in the attribute are stable (consider #![feature(min_const_generics, min_specialization)]). But other than that it seems doable.

jyn514 · 2021-04-02T23:36:22Z

Would it be possible to also provide a rustfix suggestion that deletes the line?

Done.

… stabilized I don't know how to test this. I confirmed locally that this gives the appropriate help with `channel = "beta"`: ``` error[E0554]: `#![feature]` may not be used on the beta release channel --> src/lib.rs:2:1 | 2 | #![feature(min_const_generics)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute | = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable error[E0554]: `#![feature]` may not be used on the beta release channel --> src/lib.rs:3:1 | 3 | #![feature(min_const_generics, min_specialization)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable error[E0554]: `#![feature]` may not be used on the beta release channel --> src/lib.rs:4:1 | 4 | #![feature(box_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^ ```

joshtriplett · 2021-04-03T05:56:38Z

@jyn514 In theory, if you get #![feature(stable_feature, unstable_feature)], it'd be possible to give a rustfix suggestion to delete just stable_feature, , but since the resulting code still won't compile on stable, I don't know if that's worth the extra effort.

This LGTM, and thanks for implementing the rustfix!

jyn514 · 2021-04-19T12:09:09Z

@estebank will you have time to look at this sometime soon?

estebank · 2021-04-21T01:43:17Z

@bors r+

bors · 2021-04-21T01:43:18Z

📌 Commit 53a1105 has been approved by estebank

bors · 2021-04-21T07:23:43Z

⌛ Testing commit 53a1105 with merge d3665eadefdd3fa7a5960ebaf1cfd05ed8d26750...

rust-log-analyzer · 2021-04-21T07:29:42Z

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

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

bors · 2021-04-21T07:31:06Z

💔 Test failed - checks-actions

On stable, suggest removing `#![feature]` for features that have been stabilized I don't know how to test this (https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Run.20tests.20without.20enabling.20nightly.20features.3F). I confirmed locally that this gives the appropriate help with `channel = "beta"`: ``` error[E0554]: `#![feature]` may not be used on the beta release channel --> src/lib.rs:2:1 | 2 | #![feature(min_const_generics)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute | = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable error[E0554]: `#![feature]` may not be used on the beta release channel --> src/lib.rs:3:1 | 3 | #![feature(min_const_generics, min_specialization)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable error[E0554]: `#![feature]` may not be used on the beta release channel --> src/lib.rs:4:1 | 4 | #![feature(box_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^ ``` Closes rust-lang#83715.

bors · 2021-04-23T08:17:24Z

⌛ Testing commit 53a1105 with merge 9a09752f514c67aea71428c9c52245e1ed009643...

bors · 2021-04-23T12:32:24Z

💥 Test timed out

jyn514 · 2021-04-23T12:36:37Z

@bors retry

rust-log-analyzer · 2021-04-23T12:39:52Z

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

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

On stable, suggest removing `#![feature]` for features that have been stabilized I don't know how to test this (https://rust-lang.zulipchat.com/#narrow/stream/182449-t-compiler.2Fhelp/topic/Run.20tests.20without.20enabling.20nightly.20features.3F). I confirmed locally that this gives the appropriate help with `channel = "beta"`: ``` error[E0554]: `#![feature]` may not be used on the beta release channel --> src/lib.rs:2:1 | 2 | #![feature(min_const_generics)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: remove the attribute | = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable error[E0554]: `#![feature]` may not be used on the beta release channel --> src/lib.rs:3:1 | 3 | #![feature(min_const_generics, min_specialization)] | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = help: the feature `min_const_generics` has been stable since 1.51.0 and no longer requires an attribute to enable error[E0554]: `#![feature]` may not be used on the beta release channel --> src/lib.rs:4:1 | 4 | #![feature(box_patterns)] | ^^^^^^^^^^^^^^^^^^^^^^^^^ ``` Closes rust-lang#83715.

bors · 2021-04-24T02:25:59Z

⌛ Testing commit 53a1105 with merge a7aba58...

bors · 2021-04-24T04:54:05Z

☀️ Test successful - checks-actions
Approved by: estebank
Pushing a7aba58 to master...

jyn514 added A-diagnostics Area: Messages for errors, warnings, and lints A-stability Area: `#[stable]`, `#[unstable]` etc. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Mar 31, 2021

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jyn514 force-pushed the stable-help branch from 2ae7534 to 9e92ca4 Compare April 2, 2021 23:35

jyn514 force-pushed the stable-help branch from 9e92ca4 to 53a1105 Compare April 2, 2021 23:36

jyn514 mentioned this pull request Apr 6, 2021

rustdoc: Link to the docs on namespaces when an unknown disambiguator is found #83866

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Rollup of 10 pull requests #84425

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Rollup of 12 pull requests #84432

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Rollup of 11 pull requests #84454

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Rollup of 13 pull requests #84477

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Rollup of 11 pull requests #84483

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jruderman mentioned this pull request Sep 9, 2021

Missing help when trying to enable stabilized library feature on stable #88802

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On stable, suggest removing `#![feature]` for features that have been stabilized #83722

On stable, suggest removing `#![feature]` for features that have been stabilized #83722

jyn514 commented Mar 31, 2021 •

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On stable, suggest removing #![feature] for features that have been stabilized #83722

On stable, suggest removing #![feature] for features that have been stabilized #83722

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On stable, suggest removing `#![feature]` for features that have been stabilized #83722

On stable, suggest removing `#![feature]` for features that have been stabilized #83722

jyn514 commented Mar 31, 2021 •

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