Fancy implicit views

views.scala

trait %>[From, To] {
  def apply(x: From): To
}

def view[From, To](f: From => To): From %> To = 
  new %>[From, To] { 
    def apply(x: From): To = f(x) 
  }

implicit i: Int %> String = view(_.toString)

def foo[A](a: A)(implicit ev: A %> String): String = ev(a)

foo(Some(10)) // does not compile
foo(10) // compiles