Welcome to Scala version 2.10.1 (Java HotSpot(TM) 64-Bit Server VM, Java 1.7.0_17).
Type in expressions to have them evaluated.
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scala> "delayed".toUerror: uncaught exception during compilation: java.lang.AssertionError
                 toUpperCase

Failed to initialize the REPL due to an unexpected error.
This is a bug, please, report it along with the error diagnostics printed below.
java.lang.AssertionError: assertion failed:
     while compiling: <console>
        during phase: global=icode, atPhase=patmat
     library version: version 2.10.1
    compiler version: version 2.10.1
  reconstructed args:

  last tree to typer: term value
              symbol: variable value in object $eval (flags: <mutable> <triedcooking> private[this])
   symbol definition: private[this] var value: tools.nsc.interpreter.IMain
                 tpe: <notype>
       symbol owners: variable value -> object $eval -> package $line1
      context owners: object $eval -> package $line1

== Enclosing template or block ==

Template( // val <local $eval>: <notype> in object $eval, tree.tpe=$line1.$eval.type
  "java.lang.Object" // parents
  ValDef(
    private
    "_"
    <tpt>
    <empty>
  )
  // 5 statements
  ValDef( // private[this] var value: scala.tools.nsc.interpreter.IMain in object $eval
    private <mutable> <local> <defaultinit> <triedcooking>
    "value "
    <tpt> // tree.tpe=tools.nsc.interpreter.IMain
    <empty>
  )
  DefDef( // def value: scala.tools.nsc.interpreter.IMain in object $eval
    <method> <accessor> <defaultinit> <triedcooking>
    "value"
    []
    List(Nil)
    <tpt> // tree.tpe=tools.nsc.interpreter.IMain
    $eval.this."value " // private[this] var value: scala.tools.nsc.interpreter.IMain in object $eval, tree.tpe=tools.nsc.interpreter.IMain
  )
  DefDef( // def value_=(x$1: scala.tools.nsc.interpreter.IMain): Unit in object $eval
    <method> <accessor> <defaultinit> <triedcooking>
    "value_$eq"
    []
    // 1 parameter list
    ValDef( // x$1: tools.nsc.interpreter.IMain
      <param> <synthetic> <triedcooking>
      "x$1"
      <tpt> // tree.tpe=tools.nsc.interpreter.IMain
      <empty>
    )
    <tpt> // tree.tpe=Unit
    Assign( // tree.tpe=Unit
      $eval.this."value " // private[this] var value: scala.tools.nsc.interpreter.IMain in object $eval, tree.tpe=tools.nsc.interpreter.IMain
      "x$1" // x$1: tools.nsc.interpreter.IMain, tree.tpe=tools.nsc.interpreter.IMain
    )
  )
  DefDef( // def set(x: Any): Unit in object $eval
    <method>
    "set"
    []
    // 1 parameter list
    ValDef( // x: Any
      <param> <triedcooking>
      "x"
      <tpt> // tree.tpe=Object
      <empty>
    )
    <tpt> // tree.tpe=Unit
    Apply( // def value_=(x$1: scala.tools.nsc.interpreter.IMain): Unit in object $eval, tree.tpe=Unit
      $eval.this."value_$eq" // def value_=(x$1: scala.tools.nsc.interpreter.IMain): Unit in object $eval, tree.tpe=(x$1: tools.nsc.interpreter.IMain)Unit
      Apply( // final def $asInstanceOf[T0](): T0 in class Object, tree.tpe=tools.nsc.interpreter.IMain
        TypeApply( // final def $asInstanceOf[T0](): T0 in class Object, tree.tpe=()tools.nsc.interpreter.IMain
          "x"."$asInstanceOf" // final def $asInstanceOf[T0](): T0 in class Object, tree.tpe=[T0 >: ? <: ?]()T0
          <tpt> // tree.tpe=tools.nsc.interpreter.IMain
        )
        Nil
      )
    )
  )
  DefDef( // def <init>(): $line1.$eval.type in object $eval
    <method>
    "<init>"
    []
    List(Nil)
    <tpt> // tree.tpe=$line1.$eval.type
    Block( // tree.tpe=Unit
      Apply( // def <init>(): Object in class Object, tree.tpe=Object
        $eval.super."<init>" // def <init>(): Object in class Object, tree.tpe=()Object
        Nil
      )
      ()
    )
  )
)

== Expanded type of tree ==

<notype>

Duplicate primitive method ==
	at scala.tools.nsc.backend.ScalaPrimitives.addPrimitive(ScalaPrimitives.scala:440)
	at scala.tools.nsc.backend.ScalaPrimitives.addPrimitives(ScalaPrimitives.scala:449)
	at scala.tools.nsc.backend.ScalaPrimitives.init(ScalaPrimitives.scala:328)
	at scala.tools.nsc.backend.icode.GenICode$ICodePhase.run(GenICode.scala:55)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1582)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1556)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1552)
	at scala.tools.nsc.interpreter.IMain.compileSourcesKeepingRun(IMain.scala:428)
	at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.compileAndSaveRun(IMain.scala:801)
	at scala.tools.nsc.interpreter.IMain$ReadEvalPrint.compile(IMain.scala:761)
	at scala.tools.nsc.interpreter.IMain.bind(IMain.scala:618)
	at scala.tools.nsc.interpreter.IMain.bind(IMain.scala:661)
	at scala.tools.nsc.interpreter.IMain$$anonfun$quietBind$1.apply(IMain.scala:660)
	at scala.tools.nsc.interpreter.IMain$$anonfun$quietBind$1.apply(IMain.scala:660)
	at scala.tools.nsc.interpreter.IMain.beQuietDuring(IMain.scala:232)
	at scala.tools.nsc.interpreter.IMain.quietBind(IMain.scala:660)
	at scala.tools.nsc.interpreter.ILoop$$anonfun$process$1$$anonfun$apply$mcZ$sp$2.apply$mcV$sp(ILoop.scala:838)
	at scala.tools.nsc.interpreter.ILoopInit$class.runThunks(ILoopInit.scala:122)
	at scala.tools.nsc.interpreter.ILoop.runThunks(ILoop.scala:42)
	at scala.tools.nsc.interpreter.ILoopInit$class.postInitialization(ILoopInit.scala:95)
	at scala.tools.nsc.interpreter.ILoop.postInitialization(ILoop.scala:42)
	at scala.tools.nsc.interpreter.ILoopInit$$anonfun$createAsyncListener$1.apply$mcV$sp(ILoopInit.scala:63)
	at scala.tools.nsc.interpreter.ILoopInit$$anonfun$createAsyncListener$1.apply(ILoopInit.scala:60)
	at scala.tools.nsc.interpreter.ILoopInit$$anonfun$createAsyncListener$1.apply(ILoopInit.scala:60)
	at scala.tools.nsc.io.package$$anon$3.call(package.scala:40)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
	at java.lang.Thread.run(Thread.java:722)