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object OhNoes {
sealed trait F
sealed abstract class FA extends F
sealed abstract class FB extends F
case object FA1 extends FA
case object FB1 extends FB
case object FB2 extends FB
sealed trait G
case object G1 extends G
case object G2 extends G
sealed trait H
case class H1(a: FB, b: G) extends H
case class H2(a: F) extends H
val demo: H => Unit = {
case H1(FB1, G1) =>
case H1(FB2, G2) =>
case H2(_: FB) =>
case H2(_: FA) =>
case H1(FB1, G2) =>
case H1(FB2, G1) =>
}
}
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