I hate Rust's solution because it's not a solution at all.

Interpolation only works in a small subset of cases, which makes you constantly having to think whether it can or can't be used in the current situation and requires endless churn when refactoring code.

At the very minimum, they need to allow it to work with field access.

On the other hand, in python, while examples like this site exist and are funny/weird/quirky in practice nobody cares, and they just enjoy using fstrings.