diff -r a6378c19836b -r ec77c7b46c37 src/share/classes/com/sun/tools/javac/tree/JCTree.java
--- a/src/share/classes/com/sun/tools/javac/tree/JCTree.java	Fri Aug 16 10:32:42 2013 +0100
+++ b/src/share/classes/com/sun/tools/javac/tree/JCTree.java	Thu Aug 15 22:33:43 2013 +0200
@@ -645,7 +645,7 @@
         public List<Type> targets;
 
         public Type getDescriptorType(Types types) {
-            return types.findDescriptorType(targets.head);
+            return targets.nonEmpty() ? types.findDescriptorType(targets.head) : types.createErrorType(null);
         }
     }