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

dart/lib/compiler/implementation/tree/unparser.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 // Returns null if no need to rename a node.
 typedef String Renamer(Node node);
 
 class Unparser implements Visitor {
   Renamer rename;
   StringBuffer sb;
@@ skipping 188 matching lines @@
     add(node.token.value);
   }
 
   visitNewExpression(NewExpression node) {
     addToken(node.newToken);
     visit(node.send);
   }
 
   visitLiteralList(LiteralList node) {
     addToken(node.constKeyword);
-    if (node.type !== null) {
-      sb.add('<');
-      visit(node.type);
-      sb.add('>');
-    }
+    visit(node.typeArguments);
     visit(node.elements);
   }
 
   visitModifiers(Modifiers node) => node.visitChildren(this);
 
   /**
    * Unparses given NodeList starting from specific node.
    */
   unparseNodeListFrom(NodeList node, Link<Node> from) {
     if (from.isEmpty()) return;
@@ skipping 276 matching lines @@
       sb.add(' ');
     }
     visit(node.name);
     if (node.typeParameters !== null) {
       visit(node.typeParameters);
     }
     visit(node.formals);
     add(node.endToken.value);
   }
 }