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milessabin/gist:2cc749c84e504876cb6e9507993fa7c4

Created September 12, 2016 23:38
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gistfile1.txt
scala> def stuff(xs: ::[Int]): Int = xs.head
stuff: (xs: ::[Int])Int
scala> stuff(Nil)
<console>:13: error: type mismatch;
found : scala.collection.immutable.Nil.type
required: ::[Int]
stuff(Nil)
^
scala> stuff(::(1, ::(2, ::(3, Nil))))
res0: Int = 1
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