private constructors for generated classes

[Yanlin Wang]

I noticed that when using Truffle, constructors for generated classes are private by default. 
For example, in the “mumbler” tutorial (http://cesquivias.github.io/blog/2014/12/02/writing-a-language-in-truffle-part-2-using-truffle-and-graal/#installing-graal--truffle),  the generated class DefineNodeGen has a private constructor. 

But for for some special experiments, I want to use these constructors directly. Is there any way (truffle annotations) I can use to make these constructors public? Thanks :)

Regards,
Grace