(application) `exercise` package 3. 前往 exercise/，使用 cargo run 建構並執行二進位檔： $ cd exercise $ cargo run Compiling exercise v0.1.0 (/home/mgeisler/tmp/exercise) Finished dev [unoptimized + debuginfo] target(s) in src/main.rs 會類似如下： fn main() { println!("Edit me!"); } 5. 使用 cargo run 建構並執行更新版二進位檔： $ cargo run Compiling exercise v0.1.0 (/home/mgeisler/tmp/exercise) Finished dev [unoptimized + debuginfo] target(s) in