[antlr-interest] Error in generated tree parser with rewrite rules - possible bug?

[Benjamin Niemann]

Hi Lorenzo,

Lorenzo Dalla Vecchia wrote:
> I've built a simple tree parser to parse a tree and rewrite it (so the 
> output is also a tree).

Are you using the upcoming V3.1? 3.0 does not support treeparsers with 
output=AST.

> tree grammar MyGrammar;
>  
> options {
>  output       = AST;
>  ASTLabelType = CommonTree;
> }
>  
> tokens {
>  ...some tokens used for rewrite...
> }
> 
> ...parser rules... with tree rewrite (new 3.0 syntax)
>  
>  
> ANTLR Tool compiles the grammar correctly, but the resulting Java file 
> has several errors.
>  
> - if I don't rewrite all rules, many errors "The method create(Token) in 
> the type TreeAdaptor is not applicable for the arguments (CommonTree)"
>  
> - even after putting rewrite rules everywhere, each rule method has an 
> error "retval.stop cannot be resolved or is not a field", inside a 
> adaptor.setToeknBoundaries call
>  
> - if I comment out the setTokenBoundaries calls in the generated code, I 
> get runtime ClassCastException about trying to cast CommonTree to token
>  
> What could be the issue? May it be a bug in tree parsers with AST output?
> Thanks.