Overrides.swift

class BaseClass {
    class func entityName() -> String {
        return ""
    }
}

class FirstClass: BaseClass {
    override class func entityName() -> String {
        return "FirstClass"
    }
}

class SecondClass: BaseClass {
    override class func entityName() -> String {
        return "SecondClass"
    }
}

func somethingWithFirst<T: FirstClass>(someType: T.Type) {
    someType.entityName() // Ambiguous use of 'entityName()'
}

func somethingWithSecond<T: SecondClass>(someType: T.Type) {
    someType.entityName() // Ambiguous use of 'entityName()'
}