[antlr-interest] Q re syntax for relative root for TreePatternMatcher

[Gerald Rosenberg]

Given an actual AST structure of

         ^(ROOT ^(PACKAGE ^(PACKAGENAME ID+)))

this tree pattern rule works as expected

         package : ^(PACKAGE ^(PACKAGENAME id+=ID+)) ;

and this works

         package : PACKAGE ;

However, this rule does not

         package : PACKAGE ^(PACKAGENAME id+=ID+) ;

Seems that it generates code that expects a flat structure:

                PACKAGE5 = (AstTree) match(input, PACKAGE, 
FOLLOW_PACKAGE_in_packageStatement162);
                 if (state.failed) return;
                 match(input, PACKAGENAME, 
FOLLOW_PACKAGENAME_in_packageStatement166);
                 if (state.failed) return;

                 match(input, Token.DOWN, null);
                 ...

Is this is intended behavior?

Thanks...