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I noticed that in the following circumstances, the scala type "Int" can be used, but Any or Nothing, cannot. 

user match { case Int => "scala int" case Any => "?" }

How and why does scala's case class differentiate between these types as being matchable?

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    When you write case Int => you're probably not getting what you expect. It'll only match the Int companion object, which provides e.g. Int.MaxValue, etc. Commented Oct 8, 2014 at 13:52

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Nothing is not really a type at all (there exist no instances of this type - http://www.scala-lang.org/api/2.10.4/index.html#scala.Nothing). To match Any you can just use _

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If you write it correctly:

user match { case _: Int => "scala int" case _: Any => "?" }

you can use Any (though it isn't useful, as Eugene points out). You can't use Nothing because it could never match.

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