Record literal list type arguments and report errors when there are too many.

dart/lib/compiler/implementation/scanner/listener.dart

Index: dart/lib/compiler/implementation/scanner/listener.dart
diff --git a/dart/lib/compiler/implementation/scanner/listener.dart b/dart/lib/compiler/implementation/scanner/listener.dart
index b2fe6befd1a7fb79bdca923c289bfc52aeab9c1f..33118f5ba07bf17830680b1ee286d6a606ffb44c 100644
--- a/dart/lib/compiler/implementation/scanner/listener.dart
+++ b/dart/lib/compiler/implementation/scanner/listener.dart
@@ -1311,9 +1311,7 @@ class NodeListener extends ElementListener {
   void handleLiteralList(int count, Token beginToken, Token constKeyword,
                          Token endToken) {
     NodeList elements = makeNodeList(count, beginToken, endToken, ',');
-    NodeList typeArguments = popNode();
-    // TODO(ahe): Type arguments are discarded.
-    pushNode(new LiteralList(null, elements, constKeyword));
+    pushNode(new LiteralList(popNode(), elements, constKeyword));
   }
 
   void handleIndexedExpression(Token openSquareBracket,