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object Test {
def main(args: Array[String]) {
import scala.collection.immutable._
val x = TreeSet("a", "b", "c", "d")
val x2 = x + "e"
assert(x2.toString == "TreeSet(a, b, c, d, e)")
assert(x2.toString == runtime.ScalaRunTime.stringOf(x2).trim)
}
}
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