Hi guys !

Parse::RecDescent has RD_TRACE , which when is set to 1 , tells you
which rule the parser it's trying , what it matches , what part of the
input consumes , and so on . Does treetop have an equivalent to this ?
I don't really find the documentation available for it to be that good ,
and calling parser.failure_line and parser.failure_column returns 1,1 no
matter what. Help !
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