rust/compiler/rustc_lint
bors d170833431 Auto merge of #112431 - Urgau:cast_ref_to_mut_improvments, r=Nilstrieb
Improve `invalid_reference_casting` lint

This PR is a follow-up to https://github.com/rust-lang/rust/pull/111567 and https://github.com/rust-lang/rust/pull/113422.

This PR does multiple things:
 - First it adds support for deferred de-reference, the goal is to support code like this, where the casting and de-reference are not done on the same expression
    ```rust
    let myself = self as *const Self as *mut Self;
    *myself = Self::Ready(value);
    ```
 - Second it does not lint anymore on SB/TB UB code by only checking assignments (`=`, `+=`, ...) and creation of mutable references `&mut *`
 - Thirdly it greatly improves the diagnostics in particular for cast from `&mut` to `&mut` or assignments
 - ~~And lastly it renames the lint from `cast_ref_to_mut` to `invalid_reference_casting` which is more consistent with the ["rules"](https://github.com/rust-lang/rust-clippy/issues/2845) and also more consistent with what the lint checks~~ *https://github.com/rust-lang/rust/pull/113422*

This PR is best reviewed commit by commit.

r? compiler
2023-08-02 11:25:13 +00:00
..
src Auto merge of #112431 - Urgau:cast_ref_to_mut_improvments, r=Nilstrieb 2023-08-02 11:25:13 +00:00
Cargo.toml
messages.ftl Improve diagnostics of the invalid_reference_casting lint 2023-07-29 12:20:59 +02:00