t6340.scala:11: error: value D is not a member of object Foo
  import Foo.{ A, B, C, D, E, X, Y, Z }
         ^
t6340.scala:16: error: not found: type D
  val d = new D
              ^
t6340.scala:17: error: not found: type W
  val w = new W
              ^
three errors found