[antlr-interest] Duplicate nodes on a parse tree?

[Vadim Tropashko]

I'm leveraging debugger parse tree generation as
described in
http://www.antlr.org/wiki/pages/viewpage.action?pageId=1760

Everything works as advertised, although I'm getting
duplicate nodes. For example given the rule:

boolean_primary options { backtrack=true; }
:         sim_expr
|
 member_predicate
|                          comparison_predicate
;

I'm getting the tree branch like this

boolean_primary
    sim_expr
        ....
    sim_expr
        ....

Is the duplicate "sim_expr" branch occurrence due to
backtracking?  Then what would be the right way to
filter out those ghost nodes? 


 
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