anyone got a clue what's going on here?
i know what the error message means, but i don't understand what causes `'static` lifetime to be required, considering I've explicitly specified the `'a`.
there's this answer https://users.rust-lang.org/t/box-with-a-trait-object-requires-static-lifetime/35261/2 but it's from 2019 - did the language change?
what am i overlooking?