Implement reflection on annotations of parameters.

sdk/lib/_internal/compiler/implementation/js/builder.dart

 // Copyright (c) 2013, 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.
 
 // Utilities for building JS ASTs at runtime.  Contains a builder class
 // and a parser that parses part of the language.
 
 part of js;
 
 class JsBuilder {
@@ skipping 108 matching lines @@
     } else if (expression is num) {
       return new LiteralNumber('$expression');
     } else if (expression is bool) {
       return new LiteralBool(expression);
     } else if (expression is Map) {
       if (!expression.isEmpty) {
         throw new ArgumentError('expression should be an empty Map');
       }
       return new ObjectInitializer([]);
     } else if (expression is List) {
-      var values = new List<ArrayElement>(expression.length);
-      int index = 0;
-      for (var entry in expression) {
-        values[index] = new ArrayElement(index, toExpression(entry));
-        index++;
-      }
+      var values = new List<ArrayElement>.generate(expression.length,
+          (index) => new ArrayElement(index, toExpression(expression[index])));
       return new ArrayInitializer(values.length, values);
     } else {
       throw new ArgumentError('expression should be an Expression, '
-                              'a String, a num, a bool, or a Map');
+                              'a String, a num, a bool, a Map, or a List;');
     }
   }
 
   ForIn forIn(String name, object, statement) {
     return new ForIn(defineVar(name),
                      toExpression(object),
                      toStatement(statement));
   }
 
   For for_(init, condition, update, statement) {
@@ skipping 643 matching lines @@
   }
 
   Node visitLiteralNull(LiteralNull node) {
     return node;
   }
 
   Node visitLiteralBool(LiteralBool node) {
     return node;
   }
 }