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object Test {
import scala.collection._
((Map(1 -> "a", 2 -> "b"): collection.Map[Int, String]) map identity[(Int, String)]) : scala.collection.Map[Int,String]
((SortedMap(1 -> "a", 2 -> "b"): collection.SortedMap[Int, String]) map identity[(Int, String)]): scala.collection.SortedMap[Int,String]
((SortedSet(1, 2): collection.SortedSet[Int]) map identity[Int]): scala.collection.SortedSet[Int]
}
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