Listing 6.2 will give Wrong forward reference,
Can not be evaluated at Scala console either.
Slave can be defined as an inner object of Master as:

import scala.actors.Actor
import scala.actors.Actor._

object Master extends Actor {
  def act() {
    Slave ! 'doWork
    react {
      case 'done =>
        throw new Exception("Master crashed")
    }
  }

  object Slave extends Actor {
    def act() {
      link(Master)
      loop {
        react {
          case 'doWork =>
            println("Done")
            reply('done)
        }
      }
    }
  }
}


scala> Master.Slave.start()
res0: scala.actors.Actor = Master$Slave$@267fbe19

scala> Master.Slave.getState
res1: scala.actors.Actor.State.Value = Suspended

scala> Master.start()
res2: scala.actors.Actor = Master$@22006edb

scala> Done
Master.getState
res3: scala.actors.Actor.State.Value = Terminated

scala> Master.Slave.getState
res4: scala.actors.Actor.State.Value = Terminated

Listing 7.2:

joeActor should be started before sending a message to it

Ex:

ActorWithThreadLocalWrong.joeActor.start()
println("Your name: " + (ActorWithThreadLocalWrong.joeActor !?
'YourName))
println("Your name: " + (ActorWithThreadLocalWrong.joeActor !? 'YourName))

End of first paragraph says "After that, the actor terminates normally"
which is probalbly wrong, considering that page 148 (also end of first
paragraph there) says "execution continues with the current continuation
closure".

Program output should not be colorized in eBook, e.g. output of listing
6.5, starting "I'm (re-)born".