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On stable channels, suggest removing #![feature]s that have already been stabilized #83715

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Zapeth opened this issue Mar 31, 2021 · 4 comments · Fixed by #83722
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On stable channels, suggest removing #![feature]s that have already been stabilized #83715

Zapeth opened this issue Mar 31, 2021 · 4 comments · Fixed by #83722
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@jyn514
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A-diagnostics Area: Messages for errors, warnings, and lints A-stability Area: issues related to #[stable] and #[unstable] attributes themselves. C-enhancement Category: An issue proposing an enhancement or a PR with one.

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@Zapeth
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Zapeth commented Mar 31, 2021

I was under the impression that min_const_generics should work on stable channel with version 1.51, however using the example code from #79135 I get

error[E0554]: `#![feature]` may not be used on the stable release channel
 --> src\main.rs:5:1
  |
5 | #![feature(min_const_generics)]
  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0554`.

rustc -Vv output (its the mingw package):

rustc 1.51.0
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-pc-windows-gnu
release: 1.51.0
LLVM version: 11.0.0
@eggyal
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eggyal commented Mar 31, 2021

#[feature] attributes are used to enable unstable/gated features in the nightly compiler. Once a feature stabilizes, the attribute is no longer required.

@jyn514
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jyn514 commented Mar 31, 2021

I think the compiler should suggest removing the feature gate if it's been stabilized.

@jyn514 jyn514 added A-diagnostics Area: Messages for errors, warnings, and lints A-stability Area: issues related to #[stable] and #[unstable] attributes themselves. C-enhancement Category: An issue proposing an enhancement or a PR with one. labels Mar 31, 2021
@Zapeth
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Zapeth commented Mar 31, 2021 •
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I see, I was unsure whether the error message was referring to the referred feature or the feature flag itself (since the example code of the stabilize PR was using it too I was assuming the former).

And yes, removing the feature line from the example code makes it compile, thanks.

Is there any way to make rustc ignore the feature flag and try to compile it anyway? The crate I want to use still has it included and I'd prefer not having to remove it manually until it gets removed upstream.

(re-opening since @jyn514 seems to think its a valid issue/suggestion)

@Zapeth Zapeth closed this as completed Mar 31, 2021
@Zapeth Zapeth reopened this Mar 31, 2021
@jyn514
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jyn514 commented Mar 31, 2021

Is there any way to make rustc ignore the feature flag and try to compile it anyway? The library I want to use still has it included and I'd prefer not having to remove it manually until it gets removed upstream.

No, you'll need to either patch the crate or fix it upstream.

@jyn514 jyn514 changed the title min_const_generics wont compile on rustc 1.51 stable On stable channels, suggest removing #![feature]s that have already been stabilized Mar 31, 2021
@jyn514 jyn514 self-assigned this Mar 31, 2021
@jyn514 jyn514 mentioned this issue Mar 31, 2021
Merged
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this issue Apr 22, 2021
@Dylan-DPC
Rollup merge of rust-lang#83722 - jyn514:stable-help, r=estebank
c1bfcae 
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.
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this issue Apr 22, 2021
@Dylan-DPC
Rollup merge of rust-lang#83722 - jyn514:stable-help, r=estebank
cd78afe 
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.
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this issue Apr 22, 2021
@Dylan-DPC
Rollup merge of rust-lang#83722 - jyn514:stable-help, r=estebank
59639c4 
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.
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this issue Apr 22, 2021
@Dylan-DPC
Rollup merge of rust-lang#83722 - jyn514:stable-help, r=estebank
9c15d9b 
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.
Dylan-DPC-zz pushed a commit to Dylan-DPC-zz/rust that referenced this issue Apr 23, 2021
@Dylan-DPC
Rollup merge of rust-lang#83722 - jyn514:stable-help, r=estebank
14bbf69 
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.
JohnTitor added a commit to JohnTitor/rust that referenced this issue Apr 23, 2021
@JohnTitor
Rollup merge of rust-lang#83722 - jyn514:stable-help, r=estebank
01089e0 
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 bors closed this as completed in a7aba58 Apr 24, 2021
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On stable, suggest removing #![feature] for features that have been stabilized jyn514/rust
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@eggyal @Zapeth @jyn514