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|
(* TEST
expect;
*)
module F(X : sig type t end) = struct
let f (_ : X.t) = ()
end;;
[%%expect{|
module F : functor (X : sig type t end) -> sig val f : X.t -> unit end
|}]
module M = F(struct type t = T end);;
[%%expect{|
Line 1, characters 11-35:
1 | module M = F(struct type t = T end);;
^^^^^^^^^^^^^^^^^^^^^^^^
Error: This functor has type
functor (X : sig type t end) -> sig val f : X.t -> unit end
The parameter cannot be eliminated in the result type.
Please bind the argument to a module identifier.
|}]
module M (X : sig type 'a t constraint 'a = float end) = struct
module type S = sig
type t = float
val foo : t X.t
end
end
module N = M (struct type 'a t = int constraint 'a = float end)
[%%expect{|
module M :
functor (X : sig type 'a t constraint 'a = float end) ->
sig module type S = sig type t = float val foo : t X.t end end
module N : sig module type S = sig type t = float val foo : int end end
|}]
type 'a always_int = int
module F (X : sig type t end) = struct type s = X.t always_int end
module M = F (struct type t = T end)
[%%expect{|
type 'a always_int = int
module F : functor (X : sig type t end) -> sig type s = X.t always_int end
module M : sig type s = int end
|}]
module M = struct
module F (X : sig type t end) = X
module Not_ok = F (struct type t = private [< `A] end)
end
[%%expect{|
module M :
sig
module F : functor (X : sig type t end) -> sig type t = X.t end
module Not_ok : sig type t end
end
|}]
|
