Map.Symmetric_diff_element
type ('k, 'v) t
= 'k * [ `Left of 'v | `Right of 'v | `Unequal of 'v * 'v ]
val compare : ('k -> 'k -> int) -> ('v -> 'v -> int) -> ('k, 'v) t -> ('k, 'v) t -> int
include Sexpable.S2 with type ('k, 'v) t := ('k, 'v) t
type ('a, 'b) t
val t_of_sexp : (Sexp.t -> 'a) -> (Sexp.t -> 'b) -> Sexp.t -> ('a, 'b) t
val sexp_of_t : ('a -> Sexp.t) -> ('b -> Sexp.t) -> ('a, 'b) t -> Sexp.t