Can't use $0 in edit(ConstructorCall arg)

[bblfish]

The following code

 StringBuffer code = new StringBuffer();
 code.append("com.sun.labs.rdf.sommer.Mapping.active().test($0);");
 code.append("$proceed($$);");
 System.out.println("code="+code.toString());
 arg.replace(code.toString());

Throws the following exception

 java.lang.VerifyError: (class: eg/test/atom/MetaData, method: <init> signature: (Leg/test/atom/AtomId;Ljava/util/Date;)V) Expecting to find object/array on stack
 at eg.test.MappedTest.testEntryConstruction(MappedTest.java:74)
 at eg.test.MappedTest.main(MappedTest.java:80)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at javassist.Loader.run(Loader.java:273)
 at javassist.Loader.run(Loader.java:260)
 at com.sun.labs.rdf.sommer.ClassRewriter.main(ClassRewriter.java:53)

I can use $class, $sig and $args without any problems though. How is one meant to use it?

[bblfish]

Looks like it works if instead of using $0 I just use 'this'.

StringBuffer code = new StringBuffer();
code.append("$proceed($$);");
code.append("com.sun.labs.rdf.sommer.Mapping.active().test(this);");

Also I noticed that one can only use 'this' after '$proceed($$);' otherwise one gets the same exception.