module type Creators1 =sig..end
type 'a t
type 'a tree
type key
val empty : 'a tval singleton : key -> 'a -> 'a tval of_alist : (key * 'a) list ->
[ `Duplicate_key of key
| `Ok of 'a t ]val of_alist_exn : (key * 'a) list -> 'a tval of_alist_multi : (key * 'a) list -> 'a list tval of_alist_fold : (key * 'a) list ->
init:'b -> f:('b -> 'a -> 'b) -> 'b tval of_sorted_array : (key * 'a) array ->
'a t Or_error.tval of_sorted_array_unchecked : (key * 'a) array -> 'a tval of_tree : 'a tree -> 'a t