Map.For_deriving
module type Sexp_of_m = sig ... end
module type M_of_sexp = sig ... end
module type Compare_m = sig ... end
module type Equal_m = sig ... end
module type Hash_fold_m = Hasher.S
val m__t_sexp_grammar : Sexp.Private.Raw_grammar.t
val hash_fold_m__t : (module Hash_fold_m with type t = 'k) -> (Hash.state -> 'v -> Hash.state) -> Hash.state -> ('k, 'v, _) t -> Hash.state