added support for new call statement

--HG--
branch : trunk
diff --git a/jinja2/nodes.py b/jinja2/nodes.py
index 00f6d62..b569a31 100644
--- a/jinja2/nodes.py
+++ b/jinja2/nodes.py
@@ -222,7 +222,7 @@
 
 class CallBlock(Stmt):
     """A node that represents am extended macro call."""
-    fields = ('call', 'body')
+    fields = ('call', 'args', 'defaults', 'body')
 
 
 class Set(Stmt):