[antlr-interest] AST and the interpreter

[Shaun Bogan]

Is it normal for the ANTLRWorks interpreter to stop working after
using rewrite rules and outputing an AST?  The debugger still works.
The interpreter basically fails when it tries to interpret the first
token, giving a NoViableAltException.

Also, I'm also curious what the different colors mean for the parse
tree generated by the debugger, is this supposed to show backtracking?

Thanks,
S M Bogan