Make add all also recive Arrays

These call use `java.lang.System.arraycopy` to add the elements

Author: nicolasstucki

library/src/scala/collection/mutable/IArrayBuilder.scala

@@ -17,12 +17,12 @@ sealed abstract class IArrayBuilder[T]
   def clear(): Unit = arrayBuilder.clear()
 
   /** Add all elements of an array */
-  def addAll(xs: IArray[T]): this.type =
+  def addAll(xs: IArray[T] | Array[_ <: T]): this.type =
     arrayBuilder.addAll(xs.asInstanceOf[Array[T]])
     this
 
   /** Add a slice of an array */
-  def addAll(xs: IArray[T], offset: Int, length: Int): this.type =
+  def addAll(xs: IArray[T] | Array[_ <: T], offset: Int, length: Int): this.type =
     arrayBuilder.addAll(xs.asInstanceOf[Array[T]], offset, length)
     this
 

tests/run/IArrayOps.scala

@@ -1,11 +1,6 @@
 @main def Test: Unit =
   val iarr1 = IArray(1, 2, 3)
   val iarr2 = IArray(5, 4, 5, 6)
-  // val iarr3 = IArray(
-  //   IArray(1, 2, 3),
-  //   IArray(4, 5, 6),
-  //   IArray(7, 8, 9)
-  // )
 
   println(iarr1.toSeq)
   println(iarr1.contains(1))