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$ 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
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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
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help: use the fully-qualified path to the only available implementation
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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
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