Compilare: warning: unused import: `Write` --> main.rs:4:42 | 4 | io::{BufReader, BufRead, LineWriter, Write}, | ^^^^^ | = note: `#[warn(unused_imports)]` on by default warning: unused variable: `writer` --> main.rs:80:13 | 80 | let mut writer = LineWriter::new(out_file); | ^^^^^^ help: if this is intentional, prefix it with an underscore: `_writer` | = note: `#[warn(unused_variables)]` on by default warning: variable does not need to be mutable --> main.rs:80:9 | 80 | let mut writer = LineWriter::new(out_file); | ----^^^^^^ | | | help: remove this `mut` | = note: `#[warn(unused_mut)]` on by default warning: associated function `count` is never used --> main.rs:56:8 | 56 | fn count(&mut self, word: &str) -> i32 { | ^^^^^ | = note: `#[warn(dead_code)]` on by default warning: associated function `longest_prefix` is never used --> main.rs:64:8 | 64 | fn longest_prefix(&mut self, word: &str) -> i32 { | ^^^^^^^^^^^^^^ warning: 5 warnings emitted