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When using string formatting for example with println!, one can use both numbered and unnumbered formatters to save some bytes.

Best shown with an example:

fn main() { println!("{} {} {0} {0} {1} {} {2}", "first", "second", "third"); } 

Will output:

first second first first second third third 

So the unnumbered formatters will get assigned to the values in order, this allows you to skip the index once per item.