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object Whatever {
override def equals(x: Any) = true
}
object Test extends App {
// this should make it abundantly clear Any is the best return type we can guarantee
def matchWhatever(x: Any): Any = x match { case n @ Whatever => n }
// when left to its own devices, and not under -Xfuture, the return type is Whatever.type
def matchWhateverCCE(x: Any) = x match { case n @ Whatever => n }
// just to exercise it a bit
assert(matchWhatever(1) == 1)
assert(matchWhatever("1") == "1")
try {
matchWhateverCCE("1"): Whatever.type
} catch {
case _: ClassCastException => println("whoops")
}
}
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