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anonymous / groupby.scala
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groupby.scala
Scala
1 2 3
val c = scala.collection.mutable.Set(1,2,3,4,5,6,7,8,9)
val mm = c.groupBy { i => if (i < 5) "alpha" else "beta" }
val x: scala.collection.mutable.Map[Any,Any] = mm // compiler error, type mismatch

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