[antlr-interest] Possible bug with backtrack-generated predicate methods

[franck102]

The grammar below won't compile, this looks like a bug to me? It seems that
the syntactic predicate automatically generated by the backtrack option
includes the rule parameter but doesn't have a declaration for it.
The error I get is:

[08:49:44] 1 error
[08:50:01] C:\Temp\output\TestParser.java:548: cannot find symbol
[08:50:01] symbol  : variable $program
[08:50:01] location: class TestParser
[08:50:01]         	    rule($program.tree);

=====================================================

grammar Test;

options {
	output=AST;
	backtrack=true;
}

program
	:	'raw'? ( ID->ID ) ( rule[$program.tree] -> rule )*
	|	'raw' ID
	;

rule[Object tree]
	:	'some' ID
	;	

// LEXER
// ==========================================

ID
	:	('a'..'z'|'A'..'Z'|'_') ('a'..'z'|'A'..'Z'|'0'..'9'|'_')*
	;

        
WS  :   ( ' '
        | '\t'
        | '\r'
        | '\n'
        ) {$channel=HIDDEN;}
    ;


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