[antlr-interest] The ^ and !
Terence Parr
parrt at jguru.com
Fri Sep 20 11:42:19 PDT 2002
On Friday, September 20, 2002, at 10:59 AM, Alexander Lenski wrote:
> From the CHANGES-2.7.2.txt:
>
> "Bad code gen with ^ or ! on tree root
> when building trees in a tree walker grammar such as:
>
> expr: #(PLUS^ expr expr)
> | i:INT
> ;
>
> Fortunately, ^ is simply redundant; removing it makes code ok.
> Added a warning. Added an error message for ! saying that it
> is not implemented."
>
> Are the ^ and ! not implemented yet or they are gone forever?
Hi. They are still there...just don't use ^ on the root...it's already
a root.
Ter
--
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Creator, ANTLR Parser Generator: http://www.antlr.org
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