clippy::mem_forget is a lint in the restriction group (so it's probably not as common), which fires when Yokeable is derived on a struct with a type that implements Drop, like MutexGuard<'a, _>.

I'm sure this will not be the last time something like #4152 is needed.

Minimal reproducible example: https://play.rust-lang.org/?version=stable&mode=debug&edition=2024&gist=757453c6265ea87035df2fcae691289c