up_ref
return (*method->up_ref)(method->method);
impl->method.up_ref = method_up_ref;
int (*up_ref)(void *);
p->method.up_ref = method_up_ref;
&up_ref, &down_ref))) {
&up_ref, &down_ref))) {
&up_ref, &down_ref))
&up_ref, &down_ref))
&up_ref, &down_ref))) {