./tests/patmat/t4526.scala:2: warning: match may not be exhaustive.
It would fail on the following input: _: Int
  def foo(a: Int) = a match {
                      ^
./tests/patmat/t4526.scala:7: warning: match may not be exhaustive.
It would fail on the following input: (_, _)
  def bar(a: (Int, Int)) = a match {
                             ^
./tests/patmat/t4526.scala:12: warning: match may not be exhaustive.
It would fail on the following input: (false, false), (true, true)
  def baz(a: (Boolean, Boolean)) = a match {
                                     ^
three warnings found