Implicit instantiation of undefined template” when forward declaring template class?

In order to declare a variable of any type, template or not, the entire definition of that type must be available. You cannot forward-declare a template, and then start using it as if it were defined. All you can do at that point is declaring a pointer to an object of a type based on the template, like this.

It is from my understanding that you can not forward declare something and then instantiate it in your stack (template or not).

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