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import Function.unlift
object Test {
def evens1(x: Int) = if (x % 2 == 0) Some(x) else None
def evens2: PartialFunction[Int, Int] = {
case x if x % 2 == 0 => x
}
def main(args: Array[String]): Unit = {
val f1 = evens1 _
val f2 = evens2.lift
assert(1 to 10 forall (x => f1(x) == f2(x)))
val f3 = unlift(f1)
val f4 = unlift(f2)
assert(1 to 10 forall { x =>
if (!f3.isDefinedAt(x)) !f4.isDefinedAt(x)
else f3(x) == f4(x)
})
assert(f1 eq f3.lift)
// Hmm, why is this not true:
// assert(f2 eq f4.lift)
}
}
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