$ cargo run
   Compiling traits-example v0.1.0 (file:///projects/traits-example)
error[E0790]: cannot call associated function on trait without specifying the corresponding `impl` type
  --> src/main.rs:20:43
   |
2  |     fn baby_name() -> String;
   |     ------------------------- `Animal::baby_name` defined here
...
20 |     println!("A baby dog is called a {}", Animal::baby_name());
   |                                           ^^^^^^^^^^^^^^^^^ cannot call associated function of trait
   |
help: use the fully-qualified path to the only available implementation
   |
20 |     println!("A baby dog is called a {}", <::Dog as Animal>::baby_name());
   |                                           +++++++++       +

For more information about this error, try `rustc --explain E0790`.
error: could not compile `traits-example` due to previous error