What are AnyVal.types useful for?

I've accidentally written this line of code:

scala> val f = Int
f: Int.type = object scala.Int

Seems开发者_StackOverflow社区 to work for every subtype of AnyVal except for AnyVal itself.

Is there anything I can use f for or is it just an implementation detail of Scala leaking out?

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The Int companion object is documented here. It doesn't provide a lot, but here are a couple things:

scala> val f = Int
f: Int.type = object scala.Int

scala> f.MaxValue
res1: Int = 2147483647

scala> f.box(2)
res2: java.lang.Integer = 2