Fix unparsing of variable definitions.

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.
 
 class Unparser implements Visitor {
   StringBuffer sb;
 
   Unparser();
 
   String unparse(Node node) {
@@ skipping 258 matching lines @@
 
   visitTypeVariable(TypeVariable node) {
     visit(node.name);
     if (node.bound !== null) {
       sb.add(' extends ');
       visit(node.bound);
     }
   }
 
   visitVariableDefinitions(VariableDefinitions node) {
+    visit(node.modifiers);
+    if (node.modifiers.nodes.length() > 0) {
+      sb.add(' ');
+    }
     if (node.type !== null) {
       visit(node.type);
-    } else {
-      sb.add('var');
+      sb.add(' ');
     }
-    sb.add(' ');
-    // TODO(karlklose): print modifiers.
     visit(node.definitions);
     if (node.endToken.value == const SourceString(';')) {
       add(node.endToken.value);
     }
   }
 
   visitDoWhile(DoWhile node) {
     add(node.doKeyword.value);
     sb.add(' ');
     visit(node.body);
@@ skipping 161 matching lines @@
       sb.add(' ');
     }
     visit(node.name);
     if (node.typeParameters !== null) {
       visit(node.typeParameters);
     }
     visit(node.formals);
     add(node.endToken.value);
   }
 }