// Why the file is not being excluded?

lazy val harrah_up = Project(
      id="harrah-up",
      base = file("harrah-up"),
      settings = generalSettings ++
      Seq(
        sources in (Compile, doc) ~= {
            _.filterNot{ f =>
              println("Excluding? "+f)
              val ret = f.getName == "NatTest.scala"
              if (ret) println("Excluding " + f);
              ret
            }
          }
      )
  )