Real slt = Staff_symbol_referencer::line_thickness (me) / ss;
SCM sdy = me->get_property ("least-squares-dy");
- Real dy_mus = is_number (sdy) ? ly_scm2double (sdy) : 0.0;
+ Real dy_mus = ly_c_number_p (sdy) ? ly_scm2double (sdy) : 0.0;
Real straddle = 0.0;
Real sit = (thickness - slt) / 2;