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import scala.language.postfixOps
object Test {
def main(args: Array[String]): Unit = {
assert(1 to 10 drop 10 isEmpty)
assert(1 until 10 drop 9 isEmpty)
assert(1 to 10 by 2 drop 5 isEmpty)
assert(10 to 1 by -1 drop 10 isEmpty)
assert((10 to 1 by -1 drop 9) == Seq(1))
assert((1 to 10 drop 9) == Seq(10))
assert((1 until 10 drop 9) == Nil)
assert(Stream(1 to 10).flatten.toList == Stream(1 until 11).flatten.toList)
}
}
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