autovivification WIP

Author: fglock

src/main/java/org/perlonjava/operators/Operator.java

@@ -467,6 +467,11 @@ public static RuntimeScalar substr(RuntimeScalar runtimeScalar, RuntimeList list
      * @return a RuntimeList containing the elements that were removed
      */
     public static RuntimeList splice(RuntimeArray runtimeArray, RuntimeList list) {
+
+        if (runtimeArray.elements instanceof AutovivificationArray arrayProxy) {
+            arrayProxy.vivify(runtimeArray);
+        }
+
         RuntimeList removedElements = new RuntimeList();
 
         int size = runtimeArray.elements.size();

src/main/java/org/perlonjava/runtime/RuntimeArray.java

@@ -401,6 +401,11 @@ public RuntimeList each() {
      * @return The updated array with aliases.
      */
     public RuntimeArray setArrayOfAlias(RuntimeArray arr) {
+
+        if (this.elements instanceof AutovivificationArray arrayProxy) {
+            arrayProxy.vivify(this);
+        }
+
         arr.elements.addAll(this.elements);
         return arr;
     }
@@ -411,6 +416,11 @@ public RuntimeArray setArrayOfAlias(RuntimeArray arr) {
      * @return An iterator over the elements of the array.
      */
     public Iterator<RuntimeScalar> iterator() {
+
+        if (this.elements instanceof AutovivificationArray arrayProxy) {
+            arrayProxy.vivify(this);
+        }
+
         return new RuntimeArrayIterator();
     }