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lang-cs
(State<Thing>)new State<T>whileT : Thing! But can(Thing)new T()SomeSpecificThingis aThing; but it is not true that aState<SomeSpecificThing>is aState<Thing>. There is no inheritance etc. If it were a generic interface, if could potentially beIState<out Thing>, in which case the 4.0 variance rules start to apply, and then yes, there is a cast fromIState<SomeSpecificThing>toIState<Thing>.