Welcome to Scala 2.12.4 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_131).
Type in expressions for evaluation. Or try :help.

scala> :power
Power mode enabled. :phase is at typer.
import scala.tools.nsc._, intp.global._, definitions._
Try :help or completions for vals._ and power._

scala> println(nodePrinters.nodeToString(reify { List(1, 2, 3).map(_ * 2) }.tree))
Apply(
  Apply(
    List.apply(1, 2, 3)."map"
    Function(
      ValDef(
        <param> <synthetic>
        "x$1"
        <tpt>
        <empty>
      )
      Apply(
        "x$1"."$times"
        2
      )
    )
  )
  "List"."canBuildFrom"
)