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case class Empty[a]() extends IntMap[a];
case class Node[a](left: IntMap[a], keyVal: Tuple2[Int, a], right: IntMap[a]) extends IntMap[a];
abstract class IntMap[a] {
def lookup(key: Int): a = this match {
case Empty =>
sys.error("clef inexistante")
case _ =>
};
};
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