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Code Block
match(input,VAR,FOLLOW_VAR_in_a13); 
match(input, Token.DOWN, null); 
matchAny(input); 
match(input,ID,FOLLOW_ID_in_a17); 
match(input, Token.UP, null);

On-demand serialization of a tree in java (no continuations) would be a pain. Would have to maintain a stack. Might be better for deep tree anyway. skip in node stream would skip over DOWN...UP sequence or just one token if not DOWN.