File: t751.scala

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scala 2.11.12-5
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object Test {
  def main(args: Array[String]): Unit = {
    val map =  Map(1 -> "a", 2 -> "b", 3 -> "c")
    assert(map.filterKeys(_ % 2 == 0).isInstanceOf[scala.collection.immutable.Map[_,_]])
  }
}