[antlr-interest] Simple tree-based interpreter not working....

[Terence Parr]

I think it comes from having an empty statement or {...} block.
Ter
On Oct 11, 2007, at 2:26 PM, ANTLR Mailing List wrote:

> Opening up ANTLRworks, I test out the "Simple tree-based  
> interpreter" grammar..
>
> Unfortunately, it does work, throwing a null pointer exception...
>
> Any hints?
>
> http://www.antlr.org/wiki/display/ANTLR3/Simple+tree-based+interpeter