No More Than One Class for a Type Parameter Constraint

When specifying constraints for a type parameter in a generic class, you can specify at most one class as a constraint, but  you can specify one or more interfaces.  If one of the constraints is a class type, it must come first.

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// Type must be castable to DogToy and must implement //   IEdible and IBuryable public class Dog<TFavToy>     where TFavToy : DogToy, IEdible, IBuryable

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