Type Parameter Constraints

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Type constraints allow you to impose conditions on type parameters.

Let’s revisit Enumerations. What if you’d like your enumeration to be a subtype of a trait? If this were a normal class you’d just add the trait to the list of base types during inheritance, but with enumerations you must create a new Value type by inheriting from Val. This example shows parameterized types with traits, including type constraints:

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