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object Test2 {
type Histogram = Map[_, Int] // this is now an existential type!
type StringlyHistogram = Histogram[_ >: String] // error: Test2.Histogram does not take type parameters
val xs: Histogram[String] = Map[String, Int]() // error: Test2.Histogram does not take type parameters
val ys: StringlyHistogram[String] = xs // error: Test2.StringlyHistogram does not take type parameters
val zs: StringlyHistogram = xs
val xs1 = xs
val ys1 = ys
val zs1 = zs
}
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