Static rustc_lint_defs::builtin::BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE

pub static BYTE_SLICE_IN_PACKED_STRUCT_WITH_DERIVE: &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

#[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.