140c1650e8
cast_ref_to_mut lint I see this pattern way too often, and it's completely wrong. In fact, due to how common this incorrect pattern is, [the Rustonomicon specifically points this out](https://doc.rust-lang.org/nomicon/transmutes.html). > - Transmuting an & to &mut is UB > - Transmuting an & to &mut is always UB > - No you can't do it > - No you're not special This is my first lint.