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t960.scala:18: error: ambiguous reference to overloaded definition,
both method unapply in object List of type [a](xs: List[a])Option[Null]
and method unapply in object List of type [a](xs: List[a])Option[(a, List[a])]
match argument types (List[a])
case List(x, xs) => 7
^
t960.scala:22: error: cannot resolve overloaded unapply
case List(x, xs) => 7
^
t960.scala:12: error: method unapply is defined twice
def unapply[a](xs: List[a]): Option[Null] = xs match {
^
three errors found
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