Imported From: https://issues.scala-lang.org/browse/SI-3304?orig=1
Reporter: @paulp

@dubochet said:
The first line gets compiled to:

Predef.augmentString("%d %d").format(Predef.genericWrapArray(
  Array.apply(5, Predef.wrapIntArray(Array[Int]{10})).$$asInstanceOf[Array[java.lang.Object]]()
));

Which looks strange (why the wrapIntArray on the second argument only?)

@paulp said:
Replying to [comment:2 dubochet]:

Which looks strange (why the wrapIntArray on the second argument only?)

Turns out that's because all the scala.Array primitive applies look like this:

  def apply(x: Int, xs: Int*): Array[Int] = {

Presumably because otherwise all the overloads look the same after erasure.

I propose that the thing it's trying to do, which doesn't work in the fashion it's trying:

$$asInstanceOf[Array[java.lang.Object]]

should exist as a method on WrappedArray with a name like "toBoxed". It would be plus or minus:

def toBoxed: Array[AnyRef] = array map (_.asInstanceOf[AnyRef])

@paulp said:
...returns WrappedArray[AnyRef] I guess, but you get the gist.

@odersky said:
(In r21981) Closes #3304. Review by extempore.