./tests/patmat/t4691_exhaust_extractor.scala:17: warning: match may not be exhaustive.
It would fail on the following input: _: Bar3
  def f1(x: Foo) = x match {
                     ^
./tests/patmat/t4691_exhaust_extractor.scala:23: warning: match may not be exhaustive.
It would fail on the following input: _: Bar3
  def f2(x: Foo) = x match {
                     ^
./tests/patmat/t4691_exhaust_extractor.scala:29: warning: match may not be exhaustive.
It would fail on the following input: _: Bar3
  def f3(x: Foo) = x match {
                     ^
three warnings found