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Rollup merge of #127907 - RalfJung:byte_slice_in_packed_struct_with_derive, r=nnethercote

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built-in derive: remove BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE hack and lint

Fixes https://github.com/rust-lang/rust/issues/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 https://github.com/rust-lang/rust/pull/104429, and https://github.com/unicode-org/icu4x/pull/2834 has propagated far enough to let us make this a hard error.

Cc ``@nnethercote`` ``@Manishearth``
This commit is contained in:
Matthias Krüger 2024-08-05 05:40:19 +02:00 • committed by GitHub
commit d10f2b32f0
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8 changed files with 41 additions and 232 deletions
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34
compiler/rustc_lint_defs/src/builtin.rs
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@ -26,7 +26,6 @@ declare_lint_pass! {
BARE_TRAIT_OBJECTS,
BINDINGS_WITH_VARIANT_NAME,
BREAK_WITH_LABEL_AND_LOOP,
BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE,
CENUM_IMPL_DROP_CAST,
COHERENCE_LEAK_CHECK,
CONFLICTING_REPR_HINTS,
@ -4315,39 +4314,6 @@ declare_lint! {
report_in_external_macro
}
declare_lint! {
/// The `byte_slice_in_packed_struct_with_derive` lint detects cases where a byte slice field
/// (`[u8]`) or string slice field (`str`) is used in a `packed` struct that derives one or
/// more built-in traits.
///
/// ### Example
///
/// ```rust
/// #[repr(packed)]
/// #[derive(Hash)]
/// struct FlexZeroSlice {
/// width: u8,
/// data: [u8],
/// }
/// ```
///
/// {{produces}}
///
/// ### Explanation
///
/// This was previously accepted but is being phased out, because fields in packed structs are
/// now required to implement `Copy` for `derive` to work. Byte slices and string slices are a
/// temporary exception because certain crates depended on them.
pub BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE,
Warn,
"`[u8]` or `str` used in a packed struct with `derive`",
@future_incompatible = FutureIncompatibleInfo {
reason: FutureIncompatibilityReason::FutureReleaseErrorReportInDeps,
reference: "issue #107457 <https://github.com/rust-lang/rust/issues/107457>",
};
report_in_external_macro
}
declare_lint! {
/// The `invalid_macro_export_arguments` lint detects cases where `#[macro_export]` is being used with invalid arguments.
///