public void visitBreakStatement(BreakStatement stat) {
    }

    @Override
    public void visitContinueStatement(ContinueStatement stat) {
    }

    @Override
    public void visitConstantExpression(ConstantExpression expr) {
    }

    @Override
    public void visitClassExpression(ClassExpression expr) {
    }

    @Override
    public void visitVariableExpression(VariableExpression expr) {