for (; !found && scm_is_pair (ifs); ifs = scm_cdr (ifs))
{
SCM iface = scm_hashq_ref (all_ifaces, scm_car (ifs), SCM_BOOL_F);
for (; !found && scm_is_pair (ifs); ifs = scm_cdr (ifs))
{
SCM iface = scm_hashq_ref (all_ifaces, scm_car (ifs), SCM_BOOL_F);