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Extend BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE.

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To temporarily allow a `str` field in a packed struct using `derive`,
along with `[u8]`.
This commit is contained in:
Nicholas Nethercote 2023-02-06 12:58:39 +11:00
parent ef934d9b63
commit a70d03b624
4 changed files with 81 additions and 25 deletions
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9
compiler/rustc_lint_defs/src/builtin.rs
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@ -4073,7 +4073,8 @@ declare_lint! {
declare_lint! {
/// The `byte_slice_in_packed_struct_with_derive` lint detects cases where a byte slice field
/// (`[u8]`) is used in a `packed` struct that derives one or more built-in traits.
/// (`[u8]`) or string slice field (`str`) is used in a `packed` struct that derives one or
/// more built-in traits.
///
/// ### Example
///
@ -4091,11 +4092,11 @@ declare_lint! {
/// ### 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 are a temporary
/// exception because certain crates depended on them.
/// 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]` slice used in a packed struct with `derive`",
"`[u8]` or `str` used in a packed struct with `derive`",
@future_incompatible = FutureIncompatibleInfo {
reference: "issue #107457 <https://github.com/rust-lang/rust/issues/107457>",
reason: FutureIncompatibilityReason::FutureReleaseErrorReportNow,