Suggest `std::ptr::swap(a, b)` instead of `std::mem::swap(&mut *a, &mut *b)`

[vihdzp]

What it does

This lint would find instances of a user converting two pointers into mutable references and calling swap on them. It would error upon finding them.

By the way, this mistake is an actual thing I once saw on production code: dimforge/nalgebra#919

Categories

• Kind: clippy::correctness.

What is the advantage of the recommended code over the original code

If a and b are equal or overlap, the original code is actually UB, while the latter isn't.

Drawbacks

None that I can think of.