exception Not_found of k0val singleton : 'e var -> 'x -> ('e, 'x) tval add : 'e var -> 'x -> ('e, 'x) t -> ('e, 'x) tval remove : 'e var -> ('e, 'x) t -> ('e, 'x) tval update : 'e var -> ('x option -> 'x option) -> ('e, 'x) t -> ('e, 'x) tval find : 'e var -> ('e, 'x) t -> 'xval find_opt : 'e var -> ('e, 'x) t -> 'x optionval bindings : ('e, 'x) t -> ('e var * 'x) listval mem : 'e var -> ('e, 'x) t -> boolval cardinal : ('e, 'x) t -> intval union :
('e var -> 'x -> 'x -> 'x option) ->
('e, 'x) t ->
('e, 'x) t ->
('e, 'x) tval fold : ('e var -> 'x -> 'acc -> 'acc) -> ('e, 'x) t -> 'acc -> 'accval keys : ('e, 'x) t -> 'e var listval values : ('e, 'x) t -> 'x list