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object Test {
abstract class <~<[-From, +To] extends (From => To)
implicit def trivial[A]: A <~< A = error("")
trait Forcible[T]
implicit val forcibleInt: (Int <~< Forcible[Int]) = error("")
def headProxy[P <: Forcible[Int]](implicit w: Int <~< P): P = error("")
headProxy
// trivial[Int] should not be considered a valid implicit, since w would have type Int <~< Int,
// and headProxy's type parameter P cannot be instantiated to Int
}
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