What English word would you use to describe a particular example of a type constructor, in the sense that `List[Int]` and `List[String]` are examples of `List`s? I'd like to avoid calling them "examples" if possible.
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But List[Int] is an instance of a List[T], just like how Monad[List] is an instance of Monad[F[_]]
I'm actually not sure...! Because it depends on how you interpret "instance"... (and also, I could read `Monad[List]` as a term or type expression, with different meanings)!
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If I go with "variant" (rather than instance) for the thing I'm trying to describe, would you prefer me to say, "List[Int] is a variant of List[T]", or "List[Int] is a variant of List"?
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The problem is, "is instance of" is too tainted, from OOP books and languages, to mean "is runtime value that inhabits type and exposes interface of this class"
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