rust/compiler/rustc_lint
Jack Wrenn 3ce35a4ec5 Make Copy unsafe to implement for ADTs with unsafe fields
As a rule, the application of `unsafe` to a declaration requires that use-sites
of that declaration also require `unsafe`. For example, a field declared
`unsafe` may only be read in the lexical context of an `unsafe` block.

For nearly all safe traits, the safety obligations of fields are explicitly
discharged when they are mentioned in method definitions. For example,
idiomatically implementing `Clone` (a safe trait) for a type with unsafe fields
will require `unsafe` to clone those fields.

Prior to this commit, `Copy` violated this rule. The trait is marked safe, and
although it has no explicit methods, its implementation permits reads of `Self`.

This commit resolves this by making `Copy` conditionally safe to implement. It
remains safe to implement for ADTs without unsafe fields, but unsafe to
implement for ADTs with unsafe fields.

Tracking: #132922
2024-12-07 20:50:00 +00:00
..
src Make Copy unsafe to implement for ADTs with unsafe fields 2024-12-07 20:50:00 +00:00
Cargo.toml Remove unused intercrate dependencies 2024-11-07 14:17:16 +00:00
messages.ftl Rollup merge of #118833 - Urgau:lint_function_pointer_comparisons, r=cjgillot 2024-12-05 07:29:53 +01:00