Dear Alexei, ASh> I propose this patch instead: Yes, this is better, but ASh> + if (eb.info(rational_function)) should it be like that: + if (eb.info(info_flags::rational_function)) Best wishes, Vladimir -- Vladimir V. Kisil email: kisilv at maths.leeds.ac.uk -- www: http://maths.leeds.ac.uk/~kisilv/