scala> case class K(s: java.lang.String)
defined class K

scala> class C { implicit val k: K = K("OK?"); override def toString = "C(" + k.toString + ")" }
defined class C

scala> val c = new C
c: C = C(K(OK?))

scala> import c.k
import c.k

scala> scala.Predef.implicitly[K]
res0: K = K(OK?)

scala> val k = 42
k: Int = 42

scala> k                 // was K(OK?)
res1: Int = 42

scala> :quit