val trap_error :
(unit -> ('a, string) Stdlib.result) ->
('a, string) Stdlib.resultval (let*) :
('a, 'b) Stdlib.result ->
('a -> ('c, 'b) Stdlib.result) ->
('c, 'b) Stdlib.resultval guard : bool -> 'a -> (unit, 'a) Stdlib.resultval guard_some : 'a option -> 'b -> ('a, 'b) Stdlib.resultval guard_none : 'a option -> 'b -> (unit, 'b) Stdlib.resultval u32_compare : int32 -> int32 -> int