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abstract class Bar[+B] {
}
abstract class C1[+B] extends Bar[B] {
private[this] def g(x: C1[B]): Unit = ()
// this method is fine: notice that it allows the call to g,
// which requires C1[B], even though we matched on C1[_].
// (That is good news.)
private[this] def f1(x: Bar[B]): Unit = x match {
case x: C1[_] => g(x)
}
// this one crashes.
private[this] def f2(x: Bar[B]): Unit = x match {
case x: C1[_] => f2(x)
}
}
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