[xsbt] AssertionError when trying to compile (#176)

build.sbt

libraryDependencies ++= Seq(
    "org.parboiled" % "parboiled-core" % "1.0.1",
    "org.parboiled" % "parboiled-scala" % "1.0.1"
)

HelloWorld.scala

import org.parboiled.scala.Parser

object HelloWorld extends Parser {
  def main(args: Array[String]) = {}
}