Incremental compilation error with macros and inheritance

example.src.AnnotateExample.scala

package example

import macros.Annotate
import InheritExample._

object AnnotateExample extends AnnotateExampleTrait

trait AnnotateExampleTrait {
  @Annotate()
  val integer: Int = 9

  def unit: Unit = println(otherInteger)
}

example.src.InheritExample.scala

package example

object InheritExample extends AnnotateExampleTrait {
  val otherInteger: Int = 3
}

example.test.AnnotateTest.scala

package example

import org.scalatest.{FlatSpec, Matchers}

class AnnotateTest extends FlatSpec with Matchers {
  "Annotation" should "compile and change value" in {
    AnnotateExample.integer shouldBe 0
  }
}

macros.src.Annotate.scala

package macros

import scala.annotation.StaticAnnotation
import scala.language.experimental.macros
import scala.reflect.macros.blackbox


class Annotate() extends StaticAnnotation {
  def macroTransform(annottees: Any*): Any = macro AnnotateImpl.apply
}

class AnnotateImpl(val c: blackbox.Context) {

  import c.universe._

  def apply(annottees: c.Expr[Any]*): c.Expr[Any] = {
    annottees map (_.tree) toList match {
      case (vd: ValDef) :: Nil =>
        c.Expr[Nothing](q"""val ${vd.name}: ${vd.tpe} = 0""")
    }
  }
}