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import annotation.tailrec
object Test {
@tailrec private def quux(xs: List[String]): List[String] = quux(quux(xs))
@tailrec private def quux2(xs: List[String]): List[String] = xs match {
case x1 :: x2 :: rest => quux2(x1 :: quux2(rest))
case _ => Nil
}
@tailrec private def quux3(xs: List[String]): Boolean = xs match {
case x :: xs if quux3(List("abc")) => quux3(xs)
case _ => false
}
}
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