Report arity errors on user definable operators.

sdk/lib/_internal/compiler/implementation/util/link.dart

Index: sdk/lib/_internal/compiler/implementation/util/link.dart
diff --git a/sdk/lib/_internal/compiler/implementation/util/link.dart b/sdk/lib/_internal/compiler/implementation/util/link.dart
index d16ae6cce472e95d0d84ea50550cddc5727eeacc..8a5674a43fb32456240769b568138809957991b3 100644
--- a/sdk/lib/_internal/compiler/implementation/util/link.dart
+++ b/sdk/lib/_internal/compiler/implementation/util/link.dart
@@ -49,6 +49,10 @@ class Link<T> extends Iterable<T> {
     return this.prepend(from.head).reversePrependAll(from.tail);
   }
 
+  Link<T> skip(int n) {

[ahe, 2013/01/09 13:35:46]

if (n == 0) return this;

[Johnni Winther, 2013/01/09 14:29:11]

Done.

+    throw new RangeError('No more elements');
+  }
+
   void forEach(void f(T element)) {}
 
   bool operator ==(other) {