settings.maxPrintString for Scala 2.9 REPL

以下线程建议输入settings.maxPrintString = 0：

How to force interpreter show complete stack trace?

不幸的是,这似乎不适用于Scala 2.9：

Welcome to Scala version 2.9.1.final (Java HotSpot(TM) 64-Bit Server VM,Java 1.6.0_29).
Type in expressions to have them evaluated.
Type :help for more information.

scala> settings.maxPrintString = 0
<console>:10: error: not found: value settings
val $ires0 = settings.maxPrintString
             ^
<console>:7: error: not found: value settings
       settings.maxPrintString = 0
       ^

有需要导入的东西吗？

我试过：电源,这使设置可用,但它似乎不支持maxPrintString：

scala> :power
** Power User mode enabled - BEEP BOOP SPIZ **
** :phase has been set to 'typer'.          **
** scala.tools.nsc._ has been imported      **
** global._ and definitions._ also imported **
** Try  :help,vals.<tab>,power.<tab>    **

scala> settings
res0: scala.tools.nsc.Settings = 
Settings {
  -d = .
  -Yrich-exceptions = true
  -classpath = bin:lib/*
  -encoding = UTF-8
}


scala> settings.maxPrintString = 0
<console>:31: error: value maxPrintString is not a member of scala.tools.nsc.Settings
val $ires9 = settings.maxPrintString
                      ^
<console>:28: error: value maxPrintString is not a member of scala.tools.nsc.Settings
       settings.maxPrintString = 0

我看到scala.tools.nsc.InterpreterSettings.maxPrintString存在,但我不知道如何获得一个适当的InterpreterSettings实例进行修改.