&& scm_is_symbol (scm_vector_ref (shape_vector, scm_from_int (delta))))
style = scm_vector_ref (shape_vector, scm_from_int (delta));
if (scm_is_symbol (style))
&& scm_is_symbol (scm_vector_ref (shape_vector, scm_from_int (delta))))
style = scm_vector_ref (shape_vector, scm_from_int (delta));
if (scm_is_symbol (style))