let s1 ="hello world"; let s2 = s1; // copied – x1 is still valid let x1 = 2; let x2 = x1; // copied – x1 is still valid println!("{} for the {}nd time

let s1 ="hello world"; let s2 = s1; // copied – x1 is still valid let x1 = 2; let x2 = x1; // copied – x1 is still valid println!("{} for the {}nd time!", s1, x1); Typo in first comment? s1 vs x1?