attrlist_cons
struct attrlist *attrlist_cons(struct attrlist *, struct attr *);
return attrlist_cons(next, a);
fakedev->d_attrs = attrlist_cons(NULL, attr);
a->a_deps = attrlist_cons(a->a_deps, newa);
attrs = attrlist_cons(attrs, getattr(dev->d_name));