error[E0046]: not all trait items implemented, missing: `eat` --> $DIR/class-method-missing.rs:9:1 | LL | fn eat(&self); | -------------- `eat` from trait ... LL | impl Animal for Cat { | ^^^^^^^^^^^^^^^^^^^ missing `eat` in implementation error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0046`.