Change IllegalArgumentException to ArgumentError.

lib/coreimpl/arrays.dart

Index: lib/coreimpl/arrays.dart
diff --git a/lib/coreimpl/arrays.dart b/lib/coreimpl/arrays.dart
index 7ed81a96d10bdf4e0018dacc24566f7909cd3e22..2a43a9555588a7647cfff4766e9fa85438cb664f 100644
--- a/lib/coreimpl/arrays.dart
+++ b/lib/coreimpl/arrays.dart
@@ -78,7 +78,7 @@ class Arrays {
 
   static void rangeCheck(List a, int start, int length) {
     if (length < 0) {
-      throw new IllegalArgumentException("negative length $length");
+      throw new ArgumentError("negative length $length");
     }
     if (start < 0 ) {
       String message = "$start must be greater than or equal to 0";