[antlr-interest] Getting rid of class cast exceptions to CommonTree

Terence Parr parrt at cs.usfca.edu
Thu May 22 08:54:55 PDT 2008


hi. what line exactly is giving the issue?  Perhaps we can avoid the  
cast.
Ter
On May 22, 2008, at 7:04 AM, Felix Dorner wrote:

> Hi,
>
> I use a lot of semantic predicates in my tree grammar. When a  
> FailedPredicateException is thrown, I sometimes end up with a  
> ClassCast exception, because Antlr tries to cast an "UP" or a "DOWN"  
> node, to my custom AST type. It seems that UP/DOWN are always  
> CommonTrees.
>
> I don't know where things get messed up, for now I'd just like to  
> get rid of the class cast exception.
>
> Felix



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