$ cargo run
- Compiling structs v0.1.0 (file:///projects/structs)
+ Compiling rectangles v0.1.0 (file:///projects/rectangles)
Finished dev [unoptimized + debuginfo] target(s) in 0.48s
- Running `target/debug/structs`
+ Running `target/debug/rectangles`
rect1 is Rectangle { width: 30, height: 50 }