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Tracking Issue for BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE lint #107457

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nnethercote opened this issue Jan 30, 2023 · 2 comments · Fixed by #127907
Closed

Tracking Issue for BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE lint #107457

nnethercote opened this issue Jan 30, 2023 · 2 comments · Fixed by #127907
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C-future-incompatibility Category: Future-incompatibility lints C-tracking-issue Category: A tracking issue for an RFC or an unstable feature.

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@nnethercote
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This is a tracking issue for the BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE lint, which is being added in #104429. The lint detects cases where derive is used with a packed struct that contains a [u8] field.

Example

This lint will trigger for code like this:

#[repr(packed)]
#[derive(Eq, PartialEq)]
pub struct FlexZeroSlice {
    width: u8,
    data: [u8], // triggered
}

At some point in the future this case will be disallowed.

See #104429 for more details, especially the t-lang nomination.
@nnethercote nnethercote added the C-tracking-issue Category: A tracking issue for an RFC or an unstable feature. label Jan 30, 2023
@est31
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est31 commented Jan 30, 2023

@rustbot label C-future-compatibility

@rustbot rustbot added the C-future-incompatibility Category: Future-incompatibility lints label Jan 30, 2023
nicholasbishop added a commit to nicholasbishop/uefi-rs that referenced this issue Jan 31, 2023
@nicholasbishop
Fix new lints related to derives on a packed struct
c44bf3e 
Deriving `Debug` and `PartialEq` on a packed struct containing `[u8]` fields is
being phased out. See rust-lang/rust#107457 for more
info.
@nicholasbishop nicholasbishop mentioned this issue Jan 31, 2023
Merged
2 tasks
@lukas-code lukas-code mentioned this issue Feb 4, 2023
Merged
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Feb 14, 2023
@matthiaskrgr
Rollup merge of rust-lang#107673 - lukas-code:update-icu4x, r=davidtwco
0c5c12e 
update ICU4X to 1.1.0

This patch updates the ICU4X crates to version 1.1.0 and regenerates the static data for `rustc_baked_icu_data`.

This is mostly an internal and bugfix update. It notably includes unicode-org/icu4x#2834 to fix the future compatibility warning for [`BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE`](rust-lang#107457).

[full changelog](https://github.com/unicode-org/icu4x/blob/icu%401.1.0/CHANGELOG.md)
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Feb 14, 2023
@matthiaskrgr
Rollup merge of rust-lang#107673 - lukas-code:update-icu4x, r=davidtwco
3549e42 
update ICU4X to 1.1.0

This patch updates the ICU4X crates to version 1.1.0 and regenerates the static data for `rustc_baked_icu_data`.

This is mostly an internal and bugfix update. It notably includes unicode-org/icu4x#2834 to fix the future compatibility warning for [`BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE`](rust-lang#107457).

[full changelog](https://github.com/unicode-org/icu4x/blob/icu%401.1.0/CHANGELOG.md)
RalfJung pushed a commit to RalfJung/miri that referenced this issue Feb 15, 2023
@matthiaskrgr
Rollup merge of #107673 - lukas-code:update-icu4x, r=davidtwco
e86a59a 
update ICU4X to 1.1.0

This patch updates the ICU4X crates to version 1.1.0 and regenerates the static data for `rustc_baked_icu_data`.

This is mostly an internal and bugfix update. It notably includes unicode-org/icu4x#2834 to fix the future compatibility warning for [`BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE`](rust-lang/rust#107457).

[full changelog](https://github.com/unicode-org/icu4x/blob/icu%401.1.0/CHANGELOG.md)
@kennystrawnmusic kennystrawnmusic mentioned this issue Mar 27, 2023
Closed
kennystrawnmusic added a commit to kennystrawnmusic/bootloader that referenced this issue Mar 27, 2023
@kennystrawnmusic
Refactor UEFI implementation for compliance with rust-lang/rust#107457 …
a2fc6ce 
…lint
@kennystrawnmusic kennystrawnmusic mentioned this issue Mar 27, 2023
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@traviscross
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@rustbot labels +I-lang-nominated

Let's discuss whether we want to disallow this in Rust 2024.

@rustbot rustbot added the I-lang-nominated Nominated for discussion during a lang team meeting. label Nov 15, 2023
@traviscross traviscross removed the I-lang-nominated Nominated for discussion during a lang team meeting. label Nov 15, 2023
@github-actions github-actions bot mentioned this issue Apr 9, 2024
Merged
@RalfJung RalfJung mentioned this issue Jul 18, 2024
Merged
bors added a commit to rust-lang-ci/rust that referenced this issue Jul 18, 2024
@bors
Auto merge of rust-lang#127907 - RalfJung:byte_slice_in_packed_struct…
6223d84 
…_with_derive, r=<try>

built-in derive: remove BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE hack and lint

Fixes rust-lang#107457 by turning the lint into a hard error. The lint has been shown in future breakage reports since Rust 1.69 (released in April 2023).

Let's see (via crater) if enough time has passed since rust-lang#104429, and unicode-org/icu4x#2834 has propagated far enough to let us make this a hard error.

TODO: actually remove the lint.

Cc `@nnethercote` `@Manishearth`
matthiaskrgr added a commit to matthiaskrgr/rust that referenced this issue Aug 5, 2024
@matthiaskrgr
Rollup merge of rust-lang#127907 - RalfJung:byte_slice_in_packed_stru…
12c363a 
…ct_with_derive, r=nnethercote

built-in derive: remove BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE hack and lint

Fixes rust-lang#107457 by turning the lint into a hard error. The lint has been shown in future breakage reports since Rust 1.69 (released in April 2023).

Let's see (via crater) if enough time has passed since rust-lang#104429, and unicode-org/icu4x#2834 has propagated far enough to let us make this a hard error.

Cc `@nnethercote` `@Manishearth`
@bors bors closed this as completed in d10f2b3 Aug 5, 2024
rust-timer added a commit to rust-lang-ci/rust that referenced this issue Aug 5, 2024
@rust-timer
Unrolled build for rust-lang#127907
bcfb510 
Rollup merge of rust-lang#127907 - RalfJung:byte_slice_in_packed_struct_with_derive, r=nnethercote

built-in derive: remove BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE hack and lint

Fixes rust-lang#107457 by turning the lint into a hard error. The lint has been shown in future breakage reports since Rust 1.69 (released in April 2023).

Let's see (via crater) if enough time has passed since rust-lang#104429, and unicode-org/icu4x#2834 has propagated far enough to let us make this a hard error.

Cc ``@nnethercote`` ``@Manishearth``
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Labels
C-future-incompatibility Category: Future-incompatibility lints C-tracking-issue Category: A tracking issue for an RFC or an unstable feature.
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built-in derive: remove BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE hack and lint RalfJung/rust
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@traviscross @nnethercote @est31 @rustbot