Scala Actor in script mode -

i'm trying go through chapter 9 of programming in scala, found actor sample code not run in script mode.

the code simple:

// testactor.scala  import scala.actors.actor  class redford extends actor {   def act() {     println("a lot of acting is, paying attention.")   } }  val robert = new redford robert.start 

but when run scala testactor.scala, nothing happens, program exit before redford class print anything.

but if use following code compile , run, works fine, prints message expected.

// testactorcompiled.scala  import scala.actors.actor  class redford extends actor {   def act() {     println("a lot of acting is, paying attention.")   } }  object main {   def main (args: array[string]) {     val robert = new redford     robert.start   }  }  

it seems when program run in script mode, exit before actor doing anything.

why happens? , how make program no exit before actor.act() done when program running in script mode?

update:

i'm using scala 2.8.1.final

tested on 2.8.1.final. strange thing. first time run failed with:

could not connect compilation daemon. exception in thread "main" java.lang.exception: fsc failure         @ scala.tools.nsc.compilesocket.fatal(compilesocket.scala:50)         @ scala.tools.nsc.compilesocket.getport(compilesocket.scala:122)         @ scala.tools.nsc.compilesocket.getsock$1(compilesocket.scala:152)         @ scala.tools.nsc.compilesocket.getorcreatesocket(compilesocket.scala:170)         @ scala.tools.nsc.scriptrunner$.compilewithdaemon(scriptrunner.scala:145)         @ scala.tools.nsc.scriptrunner$.compile$1(scriptrunner.scala:197)         @ scala.tools.nsc.scriptrunner$.withcompiledscript(scriptrunner.scala:225)         @ scala.tools.nsc.scriptrunner$.runscript(scriptrunner.scala:265)         @ scala.tools.nsc.maingenericrunner$.main(maingenericrunner.scala:91)         @ scala.tools.nsc.maingenericrunner.main(maingenericrunner.scala) 

the second time passed successfully:

>scala testactor.scala lot of acting is, paying attention.