Compilare: warning: unused `Result` that must be used --> main.rs:17:5 | 17 | fs::write("adunare.out", sum.to_string()); | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: this `Result` may be an `Err` variant, which should be handled = note: `#[warn(unused_must_use)]` on by default help: use `let _ = ...` to ignore the resulting value | 17 | let _ = fs::write("adunare.out", sum.to_string()); | +++++++ warning: 1 warning emitted