SCM sizes = scm_hashq_ref (font_table, f->self_scm (), SCM_EOL);
SCM handle = scm_assoc (scm_from_double (lookup_mag), sizes);
if (scm_is_pair (handle))
SCM sizes = scm_hashq_ref (font_table, f->self_scm (), SCM_EOL);
SCM handle = scm_assoc (scm_from_double (lookup_mag), sizes);
if (scm_is_pair (handle))