I can't imagine any obvious reason I would miss Rust's 2018 edition, let alone 2024 edition, to implement linear algebra? People seemed happy enough in Fortran before I was old enough to go to school and I don't sense it's an application where I'd want async for example. A lot of other edition changes are nice when writing new thing but not helpful for an existing codebase. So, like, sure, it's 2015 edition but that's fine?