Rust Is Looking for Your Feedback to Help Guide Its Future

Ooo. I want to be able to do an expression in a format string.

Instead of:

format!("{}:{} wasn't able to connect to host {}.", file!(), line!(), db_opts.hostname);

I'd rather do:

format!("{file!()}:{line!()} wasn't able to connect to host {db_opts.hostname}.");

Yes, expressions in format strings can be abused, but knee-capping a pretty standard case (`instance.field`)to prevent outlier bad behavior seems like a premature optimization.