+MAKE_SCHEME_CALLBACK(Span_bar, calc_glyph_name, 1);
+SCM
+Span_bar::calc_glyph_name (SCM smob)
+{
+ Grob *me = unsmob_grob (smob);
+ extract_grob_set (me, "elements", elements);
+ SCM gl = SCM_EOL;
+ for (vsize i = elements.size ();
+ i-- && !scm_is_string (gl);)
+ gl = elements[i]->get_property ("glyph-name");
+
+ if (!scm_is_string (gl))