Scala view application puzzler

Question

Say we have the following two traits:

trait Foo[A] { def howMany(xs: List[A]) = xs.size }
trait Bar

And an implicit conversion from the second

Answer 1

Replacing your Foo with this:

trait Foo[_] { def howMany(xs: List[_]) = xs.size }

It works, which also makes quite a lot more sense to me because your absolutly not interested in A.