[antlr-interest] The ^ and !

Alexander Lenski alenski at dca.net
Fri Sep 20 10:59:53 PDT 2002

>>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?


Alexander Lenski
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