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tpolecat/gist:6270850

Created August 19, 2013 16:09
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gistfile1.txt
case class Box[A](a:A) {
def len1(implicit ev: A <:< Seq[_]) = a.length
def len2(implicit ev: A => Seq[_]) = a.length
}
Box(List(1,2,3)).len1 // ok
Box(List(1,2,3)).len2 // ok
Box("foo").len1 // doesn't compile
Box("foo").len2 // ok
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