}
@Override
public List<SrcOp> set(GrammarAST setAST, GrammarAST labelAST, boolean invert) {
MatchSet matchOp;
if ( invert ) matchOp = new MatchNotSet(this, setAST);
else matchOp = new MatchSet(this, setAST);
if ( labelAST!=null ) {
String label = labelAST.getText();
RuleFunction rf = getCurrentRuleFunction();
if ( labelAST.parent.getType() == ANTLRParser.PLUS_ASSIGN ) {