return stencil_traverser (trans, scm_caddr (expr));
else if (scm_is_eq (scm_car (expr), ly_symbol2scm ("transparent-stencil")))
return stencil_traverser (trans, scm_cadr (expr));
return stencil_traverser (trans, scm_caddr (expr));
else if (scm_is_eq (scm_car (expr), ly_symbol2scm ("transparent-stencil")))
return stencil_traverser (trans, scm_cadr (expr));