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This is because Groovy is a dynamic language. Several other things could be happening to make this code valid at runtime. Using the MetaClass, you could add a salude() method to the Greet class at runtime. You could also add a state property to Number, which would make the welcome(..) call valid. See ExpandoMetaClass and Groovy TMPGroovy Categories.

Will I get a performance boost if I statically type all of my fields and methods?