scalac 2.8.0.x crashes when compiling the following 3 source files (strongly reduced source code from Android project Wiktionary):

//AsyncTask.java
public abstract class AsyncTask<Params, Progress, Result> {
    protected abstract Result doInBackground(Params... args);
}

//MyAsyncTask.java
public abstract class MyAsyncTask extends AsyncTask<String, String, String> {
    protected abstract String doInBackground1(String[] args);
    @Override
    protected String doInBackground(String... args) {
        return doInBackground1(new String[]{"dummy"});
    }
}

//Test.scala
class Test extends MyAsyncTask {
  protected def doInBackground1(args: Array[String]): String = ""
}

I've attached 2 error output logs I generated without resp. with the following line added in `Types.scala` (to Adriaan: "the compiler build crashes during the `quick` phase when the assert in enabled !!):

Index: src/compiler/scala/tools/nsc/symtab/Types.scala

--- src/compiler/scala/tools/nsc/symtab/Types.scala (revision 22422)
+++ src/compiler/scala/tools/nsc/symtab/Types.scala (working copy)
@@ -1881,6 +1881,7 @@

object TypeRef extends TypeRefExtractor {
def apply(pre: Type, sym: Symbol, args: List[Type]): Type = {

•  //assert((sym ne JavaRepeatedParamClass) || args.nonEmpty)
   class rawTypeRef extends TypeRef(pre, sym, args) with UniqueType
   unique(new rawTypeRef)
  

  }

My current workaround is the following:

Index: src/compiler/scala/tools/nsc/transform/UnCurry.scala

--- src/compiler/scala/tools/nsc/transform/UnCurry.scala (revision 22422)
+++ src/compiler/scala/tools/nsc/transform/UnCurry.scala (working copy)
@@ -72,7 +72,7 @@
apply(appliedType(SeqClass.typeConstructor, args))
case TypeRef(pre, JavaRepeatedParamClass, args) =>
apply(arrayType(

•        if (isUnboundedGeneric(args.head)) ObjectClass.tpe else args.head))
  

•        if (args.isEmpty || isUnboundedGeneric(args.head)) ObjectClass.tpe else args.head))
     case _ =>
       expandAlias(mapOver(tp))
   }
  

{code}