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tailrec.scala:45: error: could not optimize @tailrec annotated method facfail: it contains a recursive call not in tail position
else n * facfail(n - 1)
^
tailrec.scala:50: error: could not optimize @tailrec annotated method fail1: it is neither private nor final so can be overridden
@tailrec def fail1(x: Int): Int = fail1(x)
^
tailrec.scala:53: error: could not optimize @tailrec annotated method fail2: it contains a recursive call not in tail position
@tailrec final def fail2[T](xs: List[T]): List[T] = xs match {
^
tailrec.scala:59: error: could not optimize @tailrec annotated method fail3: it is called recursively with different type arguments
@tailrec final def fail3[T](x: Int): Int = fail3(x - 1)
^
tailrec.scala:63: error: could not optimize @tailrec annotated method fail4: it changes type of 'this' on a polymorphic recursive call
@tailrec final def fail4[U](other: Tom[U], x: Int): Int = other.fail4[U](other, x - 1)
^
5 errors found
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