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package scala {
/* An empty list. Scala provides <code>[]</code> as syntactic sugar
* for <code>Nil</code>.
*/
final case class Nil[c]() extends List[c] with {
def isEmpty = True;
def head: c = error("head of empty list");
def tail: List[c] = error("tail of empty list");
override def toString(): String = "[]";
}
}
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