11.12. Traits Example

declare GoldenCustomer
    @format(trait)
    // fields will map to getters/setters
    code     : String
    balance  : long
    discount : int
    maxExpense : long
end
In order to apply a trait to an object, the new don keyword is added: 
when
    $c : Customer()
then
    GoldenCustomer gc = don( $c, Customer.class );
end
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