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object Test extends dotty.runtime.LegacyApp {
class QSRichIterable[A](self: Iterable[A]) {
def filterMap[R](f: PartialFunction[A,R]) =
self filter (f.isDefinedAt) map f
}
object Un {
def unapply(i: Int): Option[Int] = Some(i)
}
val richIter = new QSRichIterable(List(0, 1, 2, 3, 4))
assert((richIter filterMap {case Un(3) => 7}) == List(7))
}
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