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tailrec-3.scala:4: error: could not optimize @tailrec annotated method quux: it contains a recursive call not in tail position
@tailrec private def quux(xs: List[String]): List[String] = quux(quux(xs))
^
tailrec-3.scala:6: error: could not optimize @tailrec annotated method quux2: it contains a recursive call not in tail position
case x1 :: x2 :: rest => quux2(x1 :: quux2(rest))
^
tailrec-3.scala:10: error: could not optimize @tailrec annotated method quux3: it contains a recursive call not in tail position
case x :: xs if quux3(List("abc")) => quux3(xs)
^
three errors found
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