Better logging

[l3r8yJ]

I found something interesting in std, here's an example:

use std::panic::Location;
fn validate(/*something that you want to validate*/) -> ... {
    if something_not_valid {
        let location = Location::caller();
        return Err(anyhow!(format!(
            "{location}: ..."
        )));
    }
}

this code produces a message like:
src/filename.rs:line:position: ...

it might be helpful to

[l3r8yJ]

@yegor256 is this one needed?