Scala compiler crash with -target:jvm-1.6

gistfile1.txt

Possible compiler crash during test of: /Users/grek/scala/scala/test/files/pos/t5957
java.lang.AssertionError: assertion failed: 
     while compiling: /Users/grek/scala/scala/test/files/pos/t5957/T_1.scala
        during phase: jvm
     library version: version 2.10.0-20120719-133117-f18ef37c66
    compiler version: version 2.10.0-20120719-133117-f18ef37c66
  reconstructed args: -deprecation -d /Users/grek/scala/scala/test/files/pos/t5957-pos.obj -classpath /Users/grek/scala/scala/test/files/codelib/code.jar:/Users/grek/scala/scala/build/pack/lib/scala-library.jar:/Users/grek/scala/scala/test/files/pos/t5957-pos.obj:/Users/grek/scala/scala/test/files/pos/t5957:/Users/grek/scala/scala/build/pack/lib/scala-compiler.jar:/Users/grek/scala/scala/build/pack/lib/scala-reflect.jar:/Users/grek/scala/scala/build/pack/lib/scala-library.jar:/Users/grek/scala/scala/build/pack/lib/scala-partest.jar:/Users/grek/scala/scala/lib/fjbg.jar:/Users/grek/scala/scala/build/pack/lib/scalap.jar:/Users/grek/scala/scala/build/pack/lib/scala-actors.jar:/Users/grek/scala/scala/build/pack/lib/scala-actors-migration.jar:/Users/grek/scala/scala/test/files/lib/annotations.jar:/Users/grek/scala/scala/test/files/lib/enums.jar:/Users/grek/scala/scala/test/files/lib/genericNest.jar:/Users/grek/scala/scala/test/files/lib/methvsfield.jar:/Users/grek/scala/scala/test/files/lib/nest.jar:/Users/grek/scala/scala/test/files/lib/scalacheck.jar:/Users/grek/scala/scala/build/pack/lib/scalacheck.jar

  last tree to typer: EmptyTree
              symbol: null
   symbol definition: null
                 tpe: <notype>
       symbol owners: 
      context owners: class T -> package <empty>

== Enclosing template or block ==

Template( // val <local T>: <notype> in class T, tree.tpe=T
  "java.lang.Object" // parents
  ValDef(
    private <java>
    "_"
    <tpt>
    <empty>
  )
  // 5 statements
  DefDef( // def t1(): Test$Bar in class T
    <method> <deferred>
    "t1"
    []
    List(Nil)
    <tpt> // tree.tpe=Test$Bar
    <empty>
  )
  DefDef( // def t2(): Test$Bar in class T
    <method> <deferred>
    "t2"
    []
    List(Nil)
    <tpt> // tree.tpe=Test$Bar
    <empty>
  )
  DefDef( // def t3(): Test$Baz in class T
    <method> <deferred>
    "t3"
    []
    List(Nil)
    <tpt> // tree.tpe=Test$Baz
    <empty>
  )
  DefDef( // def t4(): Test$Baz in class T
    <method> <deferred>
    "t4"
    []
    List(Nil)
    <tpt> // tree.tpe=Test$Baz
    <empty>
  )
  DefDef( // def <init>(): T in class T
    <method>
    "<init>"
    []
    List(Nil)
    <tpt> // tree.tpe=T
    Block( // tree.tpe=Unit
      Apply( // def <init>(): Object in class Object, tree.tpe=Object
        T.super."<init>" // def <init>(): Object in class Object, tree.tpe=()Object
        Nil
      )
      ()
    )
  )
)

== Expanded type of tree ==

<notype>

how can getCommonSuperclass() do its job if different class symbols get the same bytecode-level internal name: Test$Bar
	at scala.Predef$.assert(Predef.scala:170)
	at scala.tools.nsc.Global.assert(Global.scala:235)
	at scala.tools.nsc.backend.jvm.GenASM$JBuilder.javaName(GenASM.scala:600)
	at scala.tools.nsc.backend.jvm.GenASM$JBuilder.javaType(GenASM.scala:633)
	at scala.tools.nsc.backend.jvm.GenASM$JBuilder.javaType(GenASM.scala:639)
	at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genMethod(GenASM.scala:1546)
	at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder$$anonfun$genClass$4.apply(GenASM.scala:1454)
	at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder$$anonfun$genClass$4.apply(GenASM.scala:1454)
	at scala.collection.LinearSeqOptimized$class.foreach(LinearSeqOptimized.scala:59)
	at scala.collection.immutable.List.foreach(List.scala:77)
	at scala.tools.nsc.backend.jvm.GenASM$JPlainBuilder.genClass(GenASM.scala:1454)
	at scala.tools.nsc.backend.jvm.GenASM$AsmPhase.run(GenASM.scala:180)
	at scala.tools.nsc.Global$Run.compileUnitsInternal(Global.scala:1576)
	at scala.tools.nsc.Global$Run.compileUnits(Global.scala:1550)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:1546)
	at scala.tools.nsc.Global$Run.compile(Global.scala:1656)
	at scala.tools.partest.nest.DirectCompiler.compile(CompileManager.scala:133)
	at scala.tools.partest.nest.CompileManager.attemptCompile(CompileManager.scala:153)
	at scala.tools.partest.nest.RunnerManager$Runner$$anonfun$scala$tools$partest$nest$RunnerManager$Runner$$compileGroup$1$1.apply(RunnerManager.scala:327)
	at scala.tools.partest.nest.RunnerManager$Runner$$anonfun$scala$tools$partest$nest$RunnerManager$Runner$$compileGroup$1$1.apply(RunnerManager.scala:326)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.partest.nest.RunnerManager$Runner.scala$tools$partest$nest$RunnerManager$Runner$$compileGroup$1(RunnerManager.scala:326)
	at scala.tools.partest.nest.RunnerManager$Runner$$anonfun$compileFilesIn$1.apply(RunnerManager.scala:334)
	at scala.tools.partest.nest.RunnerManager$Runner$$anonfun$compileFilesIn$1.apply(RunnerManager.scala:333)
	at scala.collection.LinearSeqOptimized$class.foldLeft(LinearSeqOptimized.scala:111)
	at scala.collection.immutable.List.foldLeft(List.scala:77)
	at scala.tools.partest.nest.RunnerManager$Runner.compileFilesIn(RunnerManager.scala:333)
	at scala.tools.partest.nest.RunnerManager$Runner$$anonfun$runTestCommon$1.apply(RunnerManager.scala:345)
	at scala.tools.partest.nest.RunnerManager$Runner$$anonfun$runTestCommon$1.apply(RunnerManager.scala:343)
	at scala.tools.partest.nest.RunnerManager$Runner.runInContext(RunnerManager.scala:304)
	at scala.tools.partest.nest.RunnerManager$Runner.runTestCommon(RunnerManager.scala:343)
	at scala.tools.partest.nest.RunnerManager$Runner.processSingleFile(RunnerManager.scala:466)
	at scala.tools.partest.nest.RunnerManager$Runner.run(RunnerManager.scala:786)
	at scala.tools.partest.nest.RunnerManager$$anonfun$29.apply(RunnerManager.scala:818)
	at scala.tools.partest.nest.RunnerManager$$anonfun$29.apply(RunnerManager.scala:818)
	at scala.tools.partest.package$.timed(package.scala:35)
	at scala.tools.partest.nest.RunnerManager.runTest(RunnerManager.scala:818)
	at scala.tools.partest.nest.DirectRunner$$anonfun$2$$anonfun$apply$1.apply(DirectRunner.scala:59)
	at scala.tools.partest.nest.DirectRunner$$anonfun$2$$anonfun$apply$1.apply(DirectRunner.scala:59)
	at scala.tools.partest.package$$anon$1.call(package.scala:41)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
	at java.util.concurrent.FutureTask.run(FutureTask.java:138)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at java.lang.Thread.run(Thread.java:680)