Expands on previous function RTT to support named/optional parameters.

compiler/lib/implementation/array.dart

Index: compiler/lib/implementation/array.dart
diff --git a/compiler/lib/implementation/array.dart b/compiler/lib/implementation/array.dart
index 74f64e3d6784f7e0d1991061e8048f846106203e..0e3795a9a35094cd27c1e0cf53831e76be34698b 100644
--- a/compiler/lib/implementation/array.dart
+++ b/compiler/lib/implementation/array.dart
@@ -4,6 +4,9 @@
 
 class ListFactory {
   factory List<E>.from(Iterable<E> other) {
+    if (other == null) {
+      throw const NullPointerException();
+    }
     List<E> list = new List<E>();
     for (final e in other) {
       list.add(e);
@@ -174,6 +177,9 @@ class ListImplementation<T> implements List<T> native "Array" {
       throw const UnsupportedOperationException(
           "Cannot add to a non-extendable list");
     } else {
+      if (elements == null) {
+        throw const NullPointerException();
+      }
       for (final e in elements) {
         _add(e);
       }