Auto merge of #7643 - xFrednet:7569-splits-for-slices, r=camsteffen

New lint `index_refutable_slice` to avoid slice indexing

A new lint to check for slices that could be deconstructed to avoid indexing. This lint should hopefully prevent some panics in other projects and ICEs for us. See #7569 for an example

The implementation specifically checks for immutable bindings in `if let` statements to slices and arrays. Then it checks if these bindings are only used for value access using indices and that these indices are lower than the configured limit. I did my best to keep the implementation small, however the check was sadly quite complex. Now it's around 300 lines for the implementation and the rest are test.

---

Optional future improvements:
* Check for these instances also in `match` statements
* Check for mutable slice bindings that could also be destructed

---

changelog: New lint [`index_refutable_slice`]

I've already fixed a bunch of lint triggers in #7638 to make this PR smaller

Closes: #7569

0 files changed, 0 insertions, 0 deletions