val hash_fold_t : (Hash.state -> 'a -> Hash.state) -> (Hash.state -> 'b -> Hash.state) -> Hash.state -> ('a, 'b) t -> Hash.state
Sequence.Merge_with_duplicates_element
val hash_fold_t : (Hash.state -> 'a -> Hash.state) -> (Hash.state -> 'b -> Hash.state) -> Hash.state -> ('a, 'b) t -> Hash.state