Generate all runtime files from dart.

lib/src/js/template.dart

 // Copyright (c) 2014, 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.
 
 part of js_ast;
 
 class TemplateManager {
   Map<String, Template> expressionTemplates = new Map<String, Template>();
   Map<String, Template> statementTemplates = new Map<String, Template>();
 
@@ skipping 84 matching lines @@
   }
 
   /// Instantiates the template with the given [arguments].
   ///
   /// This method fills in the holes with the given arguments. The [arguments]
   /// must be either a [List] or a [Map].
   Node instantiate(var arguments) {
     if (arguments is List) {
       if (arguments.length != positionalArgumentCount) {
         throw 'Wrong number of template arguments, given ${arguments.length}, '
-            'expected $positionalArgumentCount';
+            'expected $positionalArgumentCount:\n$source';
       }
       return instantiator(arguments);
     }
     assert(arguments is Map);
     if (holeNames.length < arguments.length) {
       // This search is in O(n), but we only do it in case of an error, and the
       // number of holes should be quite limited.
       String unusedNames =
           arguments.keys.where((name) => !holeNames.contains(name)).join(", ");
       throw "Template arguments has unused mappings: $unusedNames";
@@ skipping 767 matching lines @@
     if (count != before) containsInterpolatedNode.add(node);
     return null;
   }
 
   visitInterpolatedNode(InterpolatedNode node) {
     containsInterpolatedNode.add(node);
     if (node.isNamed) holeNames.add(node.nameOrPosition);
     ++count;
   }
 }