scala> class A
defined class A

scala> 

scala> class B {
  def foo(x: A) = 1
}
defined class B

scala> 

scala> object defs {
  val cm = reflect.runtime.currentMirror
  val u = cm.universe
  val im = cm.reflect(new B)
  val method = im.symbol.info.member(u.TermName("foo")).asMethod
  val mm = im.reflectMethod(method)
}
defined object defs

scala> import defs._
import defs._

scala> 

scala> mm(new A)
res0: Any = 1

scala> :quit