private def foo(): scala.AllRef = {
    var x$module$0: scala.runtime.ObjectRef = new scala.runtime.ObjectRef.this(null);
    null
  };
  final private   def x$0(x$module$0: scala.runtime.ObjectRef): object test.A$x$1 = {
    if (x$module$0.elem.$asInstanceOf[object test.A$x$1]().eq(null))
      x$module$0.elem = new object test.A$x$1.this(A$class.this);
    x$module$0.elem.$asInstanceOf[object test.A$x$1]()
  };
  def /*A$class*/$init$(): scala.Unit = {
    ()
  }
}
exception when traversing abstract trait A$class extends java.lang.Object with scala.ScalaObject with test.A {
  private def foo(): scala.AllRef = {
    var x$module$0: scala.runtime.ObjectRef = new scala.runtime.ObjectRef.this(null);
    null
  };
  final private   def x$0(x$module$0: scala.runtime.ObjectRef): object test.A$x$1 = {
    if (x$module$0.elem.$asInstanceOf[object test.A$x$1]().eq(null))
      x$module$0.elem = new object test.A$x$1.this(A$class.this);
    x$module$0.elem.$asInstanceOf[object test.A$x$1]()
  };
  def /*A$class*/$init$(): scala.Unit = {
    ()
  }
}
exception when traversing package test {
  abstract trait A extends java.lang.Object with scala.ScalaObject;
  abstract trait A$class extends java.lang.Object with scala.ScalaObject with test.A {
    private def foo(): scala.AllRef = {
      var x$module$0: scala.runtime.ObjectRef = new scala.runtime.ObjectRef.this(null);
      null
    };
    final private   def x$0(x$module$0: scala.runtime.ObjectRef): object test.A$x$1 = {
      if (x$module$0.elem.$asInstanceOf[object test.A$x$1]().eq(null))
        x$module$0.elem = new object test.A$x$1.this(A$class.this);
      x$module$0.elem.$asInstanceOf[object test.A$x$1]()
    };
    def /*A$class*/$init$(): scala.Unit = {
      ()
    }
  };
  final class A$x$1 extends java.lang.Object with scala.ScalaObject$class {
    private   val $outer : test.A = _;
       def $outer(): test.A = A$x$1.this.$outer ;
    def this($outer: test.A): object test.A$x$1 = {
      if ($outer.eq(null))
        throw new java.lang.NullPointerException.this()
      else
        A$x$1.this.$outer  = $outer;
      {
        A$x$1.super.this();
        ()
      };
      ()
    }
  }
}
Exception in thread "main" scala.tools.nsc.symtab.Types$TypeError: wrong number of arguments for constructor A$x\
$1: (test.A)object test.A$x$1
	at scala.tools.nsc.typechecker.Contexts$Context.error(Contexts.scala:185)
	at scala.tools.nsc.typechecker.Typers$Typer.reportTypeError(Typers.scala:148)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:1772)
	at scala.tools.nsc.typechecker.Typers$Typer.typed(Typers.scala:1790)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.attributedDef$0(Mixin.scala:264)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.implementPrivateObject$0(Mixin.scala:303)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$31.apply(Mixin.scala:345)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$31.apply(Mixin.scala:345)
	at scala.List.flatMap(List.scala:920)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.addNewDefs(Mixin.scala:345)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.scala$tools$nsc$transform$Mixin$MixinTransformer$$postTrans\
form(Mixin.scala:357)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$35.apply(Mixin.scala:426)
	at scala.tools.nsc.transform.Mixin$MixinTransformer$$anonfun$35.apply(Mixin.scala:426)
	at scala.tools.nsc.symtab.SymbolTable.atPhase(SymbolTable.scala:71)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:426)
	at scala.tools.nsc.ast.Trees$Transformer.transformTemplate(Trees.scala:1044)
	at scala.tools.nsc.ast.Trees$Transformer$$anonfun$13.apply(Trees.scala:950)
	at scala.tools.nsc.ast.Trees$Transformer$$anonfun$13.apply(Trees.scala:949)
	at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:1064)
	at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:948)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:425)
	at scala.tools.nsc.ast.Trees$Transformer$$anonfun$25.apply(Trees.scala:1058)
	at scala.tools.nsc.ast.Trees$Transformer$$anonfun$25.apply(Trees.scala:1056)
	at scala.List$.loop$0(List.scala:232)
	at scala.List$.mapConserve(List.scala:249)
	at scala.List$.loop$0(List.scala:236)
	at scala.List$.mapConserve(List.scala:249)
	at scala.tools.nsc.ast.Trees$Transformer.transformStats(Trees.scala:1056)
	at scala.tools.nsc.ast.Trees$Transformer$$anonfun$12.apply(Trees.scala:945)
	at scala.tools.nsc.ast.Trees$Transformer$$anonfun$12.apply(Trees.scala:945)
	at scala.tools.nsc.ast.Trees$Transformer.atOwner(Trees.scala:1064)
	at scala.tools.nsc.ast.Trees$Transformer.transform(Trees.scala:944)
	at scala.tools.nsc.transform.Mixin$MixinTransformer.transform(Mixin.scala:425)
	at scala.tools.nsc.ast.Trees$Transformer.transformUnit(Trees.scala:1059)
	at scala.tools.nsc.transform.Transform$Phase.apply(Transform.scala:26)
	at scala.tools.nsc.Global$GlobalPhase.applyPhase(Global.scala:220)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$1.apply(Global.scala:209)
	at scala.tools.nsc.Global$GlobalPhase$$anonfun$1.apply(Global.scala:209)
	at scala.Iterator$class.foreach(Iterator.scala:304)
	at scala.collection.mutable.ListBuffer$$anon$0.foreach(ListBuffer.scala:216)
	at scala.tools.nsc.Global$GlobalPhase.run(Global.scala:209)
	at scala.tools.nsc.Global$Run.compileSources(Global.scala:471)
	at scala.tools.nsc.Global$Run.compile(Global.scala:535)
	at scala.tools.nsc.Main$.process(Main.scala:76)
	at scala.tools.nsc.Main$.main(Main.scala:98)
	at scala.tools.nsc.Main.main(Main.scala)