gistfile1.txt

trait $ cat SomeTrait.groovy 
trait SomeTrait {
    int getMagicNumber() {
        42
    }
}
trait $ cat SomeClass.groovy 
class SomeClass implements SomeTrait {
    static magicNumber = 'Forty Two'
}
trait $ groovyc SomeClass.groovy 
org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
SomeClass.groovy: 1: Can't have an abstract method in a non-abstract class. The class 'SomeClass' must be declared abstract or the method 'int getMagicNumber()' must be implemented.
 @ line 1, column 1.
   class SomeClass implements SomeTrait {
   ^

1 error