Trying to get simple syntax tree out of scala compiler

gistfile1.scala

import scala.tools.nsc.interactive.{Global, RefinedBuildManager}
import scala.tools.nsc.Settings
import scala.tools.nsc.reporters.StoreReporter
import scala.tools.nsc.io._
import scala.tools.nsc.util._
import scala.tools.nsc.interactive.Response
import scala.tools.nsc.util.{Position, OffsetPosition}
import scala.reflect.generic.Trees

    val settings = new Settings
    val cmp = new Global(settings, new StoreReporter())
    val src = new BatchSourceFile("<source>", "package scct { class A { val i = 1}}")
    val r = new Response[cmp.Tree]()
    cmp.askLoadedTyped(src, r)
    r.get match {
      case Left(data) =>
        def pT(t:cmp.Tree):List[String] =  {
          t match {
            // case Ident(name) => println("Got identifier: %s" format name)
            case _ =>
          }
          List(
            ("class = %s" format t.getClass),
            ("pos = %s" format t.pos),
            ("pos.getClass = %s" format t.pos.getClass),
            ("tpe = %s" format t.tpe),
            ("symbol = %s" format t.symbol),
            ""
          ) ::: t.children.filter(_.pos != NoPosition).flatMap(pT(_)).map("  " + _)
        }
        pT(data).foreach(println)
    }