Derived2_phantom.M
type ('a, 'b, 'c) t
val compare : ('a -> 'a -> int) -> ('b -> 'b -> int) -> ('a, 'b, 'c) t -> ('a, 'b, 'c) t -> int
val sexp_of_t : ('a -> Sexp.t) -> ('b -> Sexp.t) -> ('a, 'b, _) t -> Sexp.t