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exhausting.scala:21: error: match may not be exhaustive.
It would fail on the following input: List(_, _, _)
  def fail1[T](xs: List[T]) = xs match {
                              ^
exhausting.scala:27: error: match may not be exhaustive.
It would fail on the following input: Nil
  def fail2[T](xs: List[T]) = xs match {
                              ^
exhausting.scala:32: error: match may not be exhaustive.
It would fail on the following input: List(<not in (1, 2)>)
  def fail3a(xs: List[Int]) = xs match {
                              ^
exhausting.scala:39: error: match may not be exhaustive.
It would fail on the following input: Bar3
  def fail3[T](x: Foo[T]) = x match {
                            ^
exhausting.scala:47: error: match may not be exhaustive.
It would fail on the following inputs: (Bar1, Bar2), (Bar1, Bar3), (Bar2, Bar1), (Bar2, Bar2)
  def fail4[T <: AnyRef](xx: (Foo[T], Foo[T])) = xx match {
                                                 ^
exhausting.scala:56: error: match may not be exhaustive.
It would fail on the following inputs: (Bar1, Bar2), (Bar1, Bar3), (Bar2, Bar1), (Bar2, Bar2)
  def fail5[T](xx: (Foo[T], Foo[T])) = xx match {
                                       ^
6 errors found