Overload constructor of Composite iterator for lazy use cases

libraries/sandbox/extensionTraits/src/kotlin2/Iterators.kt

@@ -160,9 +160,10 @@ class FunctionIterator<T>(val nextFunction: () -> T?): AbstractIterator<T>() {
 }
 
 /** An [[Iterator]] which iterates over a number of iterators in sequence */
-class CompositeIterator<T>(vararg iterators: Iterator<T>): AbstractIterator<T>() {
+fun CompositeIterator<T>(vararg iterators: Iterator<T>) = CompositeIterator(iterators.iterator())
+
+class CompositeIterator<T>(val iterators: Iterator<Iterator<T>>): AbstractIterator<T>() {
 
-    val iteratorsIter = iterators.iterator()
     var currentIter: Iterator<T>? = null
 
     override protected fun computeNext(): Unit {