./tests/patmat/t8178.scala:6: warning: match may not be exhaustive.
It would fail on the following input: FailsChild2(_)
    f match {
      ^
./tests/patmat/t8178.scala:14: warning: match may not be exhaustive.
It would fail on the following input: VarArgs1(_)
    f match {
      ^
./tests/patmat/t8178.scala:27: warning: match may not be exhaustive.
It would fail on the following input: SeqArgs2(_)
    f match {
      ^
three warnings found