[antlr-interest] Undocumented ANTLR 3.0b6 Message?

[Bert Williams]

Greetings:

 

Whilst adding even more complexity to the grammar upon which I am working, I
got this message from the tool:

 

What does this mean?

 

 

The message came out after adding this fragment to my grammar.  I had to
enable backtracking to get ANTLR to handle the tail

differences without complaining.

 

perl_lpar_ere_expression 

options{

backtrack=true;

}

:

     perl_lpar_ere RPAREN

    | perl_lpar_ere ALTERNATE_PAREN

          ;

 

perl_lpar_ere :  perl_lpar ere ;

 

Tool Message:

 

 

F:\regexparse\tregex>java org.antlr.Tool -o src\com\prosync\regexparse
tregex.g

ANTLR Parser Generator  Version 3.0b6 (Jan 31, 2007)  1989-2007

non-LL(*) DFA 7

non-LL(*) DFA 7

 

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