For debugging, the `dbg` macro is the way to go, so you can skip string interpolation for that entirely (see https://doc.rust-lang.org/std/macro.dbg.html for details).

And when you do want to use string interpolation, you can always grab a crate such as interpolate or any of the others. (https://crates.io/search?q=interpolate). No need to change how the language works when you can download or build a library that suits you.