type ('self, 'trec, 'a) tval list0 : ('self, 'trec, 'a) t -> ('self, 'trec, 'a list) tval list0sep : ('self, 'trec, 'a) t -> ('self, norec, unit) t -> bool -> ('self, 'trec, 'a list) tval list1 : ('self, 'trec, 'a) t -> ('self, 'trec, 'a list) tval list1sep : ('self, 'trec, 'a) t -> ('self, norec, unit) t -> bool -> ('self, 'trec, 'a list) tval opt : ('self, 'trec, 'a) t -> ('self, 'trec, 'a option) tval self : ('self, mayrec, 'self) tval next : ('self, mayrec, 'self) t