I've seen this failure so many zillions of times (when recompiling via ant) and finally it is reduced.
% ./build/pack/bin/scalac src/compiler/scala/tools/nsc/interpreter/ReplReporter.scala src/compiler/scala/tools/nsc/interpreter/ReplConfig.scala
Cannot use package as value: interpreter.this
at scala.Predef$.assert(Predef.scala:161)
at scala.tools.nsc.Global.assert(Global.scala:176)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:941)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genLoadQualifier(GenICode.scala:1150)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:721)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase.genLoadQualifier(GenICode.scala:1150)
at scala.tools.nsc.backend.icode.GenICode$ICodePhase.scala$tools$nsc$backend$icode$GenICode$ICodePhase$$genLoad(GenICode.scala:894)
I've seen this failure so many zillions of times (when recompiling via ant) and finally it is reduced.