/
inclusion_errors.ml
1809 lines (1724 loc) · 48.4 KB
/
inclusion_errors.ml
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(* TEST
* expect
*)
(********************************** Equality **********************************)
module M : sig
type ('a, 'b) t = 'a * 'b
end = struct
type ('a, 'b) t = 'a * 'a
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type ('a, 'b) t = 'a * 'a
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type ('a, 'b) t = 'a * 'a end
is not included in
sig type ('a, 'b) t = 'a * 'b end
Type declarations do not match:
type ('a, 'b) t = 'a * 'a
is not included in
type ('a, 'b) t = 'a * 'b
The type 'a * 'a is not equal to the type 'a * 'b
Type 'a is not equal to type 'b
|}];;
module M : sig
type ('a, 'b) t = 'a * 'a
end = struct
type ('a, 'b) t = 'a * 'b
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type ('a, 'b) t = 'a * 'b
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type ('a, 'b) t = 'a * 'b end
is not included in
sig type ('a, 'b) t = 'a * 'a end
Type declarations do not match:
type ('a, 'b) t = 'a * 'b
is not included in
type ('a, 'b) t = 'a * 'a
The type 'a * 'b is not equal to the type 'a * 'a
Type 'b is not equal to type 'a
|}];;
type 'a x
module M: sig
type ('a,'b,'c) t = ('a * 'b * 'c * 'b * 'a) x
end = struct
type ('b,'c,'a) t = ('b * 'c * 'a * 'c * 'a) x
end
[%%expect{|
type 'a x
Lines 4-6, characters 6-3:
4 | ......struct
5 | type ('b,'c,'a) t = ('b * 'c * 'a * 'c * 'a) x
6 | end
Error: Signature mismatch:
Modules do not match:
sig type ('b, 'c, 'a) t = ('b * 'c * 'a * 'c * 'a) x end
is not included in
sig type ('a, 'b, 'c) t = ('a * 'b * 'c * 'b * 'a) x end
Type declarations do not match:
type ('b, 'c, 'a) t = ('b * 'c * 'a * 'c * 'a) x
is not included in
type ('a, 'b, 'c) t = ('a * 'b * 'c * 'b * 'a) x
The type ('b * 'c * 'a * 'c * 'a) x is not equal to the type
('b * 'c * 'a * 'c * 'b) x
Type 'a is not equal to type 'b
|}]
module M : sig
type t = <m : 'b. 'b * ('b * <m:'c. 'c * 'bar> as 'bar)>
end = struct
type t = <m : 'a. 'a * ('a * 'foo)> as 'foo
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = <m : 'a. 'a * ('a * 'foo)> as 'foo
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = < m : 'a. 'a * ('a * 'b) > as 'b end
is not included in
sig type t = < m : 'b. 'b * ('b * < m : 'c. 'c * 'a > as 'a) > end
Type declarations do not match:
type t = < m : 'a. 'a * ('a * 'b) > as 'b
is not included in
type t = < m : 'b. 'b * ('b * < m : 'c. 'c * 'a > as 'a) >
The type < m : 'a. 'a * ('a * 'd) > as 'd is not equal to the type
< m : 'b. 'b * ('b * < m : 'c. 'c * 'e > as 'e) >
The method m has type 'a. 'a * ('a * < m : 'a. 'f >) as 'f,
but the expected method type was 'c. 'c * ('b * < m : 'c. 'g >) as 'g
The universal variable 'b would escape its scope
|}];;
type s = private < m : int; .. >;;
[%%expect{|
type s = private < m : int; .. >
|}];;
module M : sig
type t = s
end = struct
type t = <m : int>
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = <m : int>
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = < m : int > end
is not included in
sig type t = s end
Type declarations do not match:
type t = < m : int >
is not included in
type t = s
The type < m : int > is not equal to the type s
The second object type has an abstract row, it cannot be closed
|}];;
module M : sig
type t = <m : int>
end = struct
type t = s
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = s
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = s end
is not included in
sig type t = < m : int > end
Type declarations do not match:
type t = s
is not included in
type t = < m : int >
The type s is not equal to the type < m : int >
The first object type has an abstract row, it cannot be closed
|}];;
module M : sig
type t =
| Foo of (int)*float
end = struct
type t =
| Foo of (int*int)*float
end;;
[%%expect{|
Lines 4-7, characters 6-3:
4 | ......struct
5 | type t =
6 | | Foo of (int*int)*float
7 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = Foo of (int * int) * float end
is not included in
sig type t = Foo of int * float end
Type declarations do not match:
type t = Foo of (int * int) * float
is not included in
type t = Foo of int * float
Constructors do not match:
Foo of (int * int) * float
is not the same as:
Foo of int * float
The type int * int is not equal to the type int
|}];;
module M : sig
type t = (int * float)
end = struct
type t = (int * float * int)
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = (int * float * int)
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = int * float * int end
is not included in
sig type t = int * float end
Type declarations do not match:
type t = int * float * int
is not included in
type t = int * float
The type int * float * int is not equal to the type int * float
|}];;
module M : sig
type t = <n : int; m : float>
end = struct
type t = <n : int; f : float>
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = <n : int; f : float>
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = < f : float; n : int > end
is not included in
sig type t = < m : float; n : int > end
Type declarations do not match:
type t = < f : float; n : int >
is not included in
type t = < m : float; n : int >
The type < f : float; n : int > is not equal to the type
< m : float; n : int >
The second object type has no method f
|}];;
module M : sig
type t = <n : int; m : float>
end = struct
type t = <n : int>
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = <n : int>
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = < n : int > end
is not included in
sig type t = < m : float; n : int > end
Type declarations do not match:
type t = < n : int >
is not included in
type t = < m : float; n : int >
The type < n : int > is not equal to the type < m : float; n : int >
The first object type has no method m
|}];;
module M4 : sig
type t = <n : int; m : float * int>
end = struct
type t = <n : int; m : int>
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = <n : int; m : int>
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = < m : int; n : int > end
is not included in
sig type t = < m : float * int; n : int > end
Type declarations do not match:
type t = < m : int; n : int >
is not included in
type t = < m : float * int; n : int >
The type < m : int; n : int > is not equal to the type
< m : float * int; n : int >
Types for method m are incompatible
|}];;
module M4 : sig
type t =
| Foo of [`Foo of string | `Bar of string]
end = struct
type t =
| Foo of [`Bar of string]
end;;
[%%expect{|
Lines 4-7, characters 6-3:
4 | ......struct
5 | type t =
6 | | Foo of [`Bar of string]
7 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = Foo of [ `Bar of string ] end
is not included in
sig type t = Foo of [ `Bar of string | `Foo of string ] end
Type declarations do not match:
type t = Foo of [ `Bar of string ]
is not included in
type t = Foo of [ `Bar of string | `Foo of string ]
Constructors do not match:
Foo of [ `Bar of string ]
is not the same as:
Foo of [ `Bar of string | `Foo of string ]
The type [ `Bar of string ] is not equal to the type
[ `Bar of string | `Foo of string ]
The first variant type does not allow tag(s) `Foo
|}];;
module M : sig
type t = private [`C of int]
end = struct
type t = private [`C]
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = private [`C]
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = private [ `C ] end
is not included in
sig type t = private [ `C of int ] end
Type declarations do not match:
type t = private [ `C ]
is not included in
type t = private [ `C of int ]
The type [ `C ] is not equal to the type [ `C of int ]
Types for tag `C are incompatible
|}];;
module M : sig
type t = private [`C]
end = struct
type t = private [`C of int]
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = private [`C of int]
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = private [ `C of int ] end
is not included in
sig type t = private [ `C ] end
Type declarations do not match:
type t = private [ `C of int ]
is not included in
type t = private [ `C ]
The type [ `C of int ] is not equal to the type [ `C ]
Types for tag `C are incompatible
|}];;
module M : sig
type t = [`C of [< `A] | `C of [`A]]
end = struct
type t = [`C of [< `A | `B] | `C of [`A]]
end;;
[%%expect{|
module M : sig type t = [ `C of [ `A ] ] end
|}];;
module M : sig
type t = private [> `A of int]
end = struct
type t = private [`A of int]
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = private [`A of int]
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = private [ `A of int ] end
is not included in
sig type t = private [> `A of int ] end
Type declarations do not match:
type t = private [ `A of int ]
is not included in
type t = private [> `A of int ]
The type [ `A of int ] is not equal to the type [> `A of int ]
The second variant type is open and the first is not
|}];;
module M : sig
type t = private [`A of int]
end = struct
type t = private [> `A of int]
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = private [> `A of int]
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = private [> `A of int ] end
is not included in
sig type t = private [ `A of int ] end
Type declarations do not match:
type t = private [> `A of int ]
is not included in
type t = private [ `A of int ]
The type [> `A of int ] is not equal to the type [ `A of int ]
The first variant type is open and the second is not
|}];;
module M : sig
type 'a t = [> `A of int | `B of int] as 'a
end = struct
type 'a t = [> `A of int] as 'a
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type 'a t = [> `A of int] as 'a
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type 'a t = 'a constraint 'a = [> `A of int ] end
is not included in
sig type 'a t = 'a constraint 'a = [> `A of int | `B of int ] end
Type declarations do not match:
type 'a t = 'a constraint 'a = [> `A of int ]
is not included in
type 'a t = 'a constraint 'a = [> `A of int | `B of int ]
The type [> `A of int ] is not equal to the type
[> `A of int | `B of int ]
The first variant type does not allow tag(s) `B
|}];;
module M : sig
type 'a t = [> `A of int] as 'a
end = struct
type 'a t = [> `A of int | `C of float] as 'a
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type 'a t = [> `A of int | `C of float] as 'a
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type 'a t = 'a constraint 'a = [> `A of int | `C of float ] end
is not included in
sig type 'a t = 'a constraint 'a = [> `A of int ] end
Type declarations do not match:
type 'a t = 'a constraint 'a = [> `A of int | `C of float ]
is not included in
type 'a t = 'a constraint 'a = [> `A of int ]
The type [> `A of int | `C of float ] is not equal to the type
[> `A of int ]
The second variant type does not allow tag(s) `C
|}];;
module M : sig
type t = [`C of [< `A | `B] | `C of [`A]]
end = struct
type t = [`C of [< `A] | `C of [`A]]
end;;
[%%expect{|
module M : sig type t = [ `C of [ `A ] ] end
|}];;
module M : sig
type t = private [< `C]
end = struct
type t = private [< `C of int&float]
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | type t = private [< `C of int&float]
5 | end..
Error: Signature mismatch:
Modules do not match:
sig type t = private [< `C of int & float ] end
is not included in
sig type t = private [< `C ] end
Type declarations do not match:
type t = private [< `C of int & float ]
is not included in
type t = private [< `C ]
Types for tag `C are incompatible
|}];;
(********************************** Moregen ***********************************)
module type T = sig
type t
end
module Int = struct
type t = int
end
module type S = sig
module Choice : T
val r : Choice.t list ref ref
end
module Force (X : functor () -> S) = struct end
module Choose () = struct
module Choice =
(val (module Int : T))
let r = ref (ref [])
end
module Ignore = Force(Choose)
[%%expect{|
module type T = sig type t end
module Int : sig type t = int end
module type S = sig module Choice : T val r : Choice.t list ref ref end
module Force : functor (X : functor () -> S) -> sig end
module Choose :
functor () -> sig module Choice : T val r : '_weak1 list ref ref end
Line 17, characters 16-29:
17 | module Ignore = Force(Choose)
^^^^^^^^^^^^^
Error: Modules do not match:
functor () -> sig module Choice : T val r : '_weak1 list ref ref end
is not included in functor () -> S
Modules do not match:
sig module Choice : T val r : '_weak1 list ref ref end
is not included in
S
Values do not match:
val r : '_weak1 list ref ref
is not included in
val r : Choice.t list ref ref
The type '_weak1 list ref ref is not compatible with the type
Choice.t list ref ref
The type constructor Choice.t would escape its scope
|}];;
module O = struct
module type s
module M: sig
val f: (module s) -> unit
end = struct
module type s
let f (module X:s) = ()
end
end;;
[%%expect{|
Lines 5-8, characters 8-5:
5 | ........struct
6 | module type s
7 | let f (module X:s) = ()
8 | end
Error: Signature mismatch:
Modules do not match:
sig module type s val f : (module s) -> unit end
is not included in
sig val f : (module s) -> unit end
Values do not match:
val f : (module s/1) -> unit
is not included in
val f : (module s/2) -> unit
The type (module s/1) -> unit is not compatible with the type
(module s/2) -> unit
Type (module s/1) is not compatible with type (module s/2)
Line 6, characters 4-17:
Definition of module type s/1
Line 2, characters 2-15:
Definition of module type s/2
|}];;
module M : sig
val f : (<m : 'b. ('b * <m: 'c. 'c * 'bar> as 'bar)>) -> unit
end = struct
let f (x : <m : 'a. ('a * 'foo)> as 'foo) = ()
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : <m : 'a. ('a * 'foo)> as 'foo) = ()
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : (< m : 'a. 'a * 'b > as 'b) -> unit end
is not included in
sig val f : < m : 'b. 'b * < m : 'c. 'c * 'a > as 'a > -> unit end
Values do not match:
val f : (< m : 'a. 'a * 'b > as 'b) -> unit
is not included in
val f : < m : 'b. 'b * < m : 'c. 'c * 'a > as 'a > -> unit
The type (< m : 'a. 'a * 'd > as 'd) -> unit
is not compatible with the type
< m : 'b. 'b * < m : 'c. 'c * 'e > as 'e > -> unit
The method m has type 'a. 'a * < m : 'a. 'f > as 'f,
but the expected method type was 'c. 'c * ('b * < m : 'c. 'g >) as 'g
The universal variable 'b would escape its scope
|}];;
type s = private < m : int; .. >;;
module M : sig
val f : s -> s
end = struct
let f (x : <m : int>) = x
end;;
[%%expect{|
type s = private < m : int; .. >
Lines 5-7, characters 6-3:
5 | ......struct
6 | let f (x : <m : int>) = x
7 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : < m : int > -> < m : int > end
is not included in
sig val f : s -> s end
Values do not match:
val f : < m : int > -> < m : int >
is not included in
val f : s -> s
The type < m : int > -> < m : int > is not compatible with the type
s -> s
Type < m : int > is not compatible with type s = < m : int; .. >
The second object type has an abstract row, it cannot be closed
|}];;
module M : sig
val f : 'a -> float
end = struct
let f : 'b -> int = fun _ -> 0
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f : 'b -> int = fun _ -> 0
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : 'b -> int end
is not included in
sig val f : 'a -> float end
Values do not match:
val f : 'b -> int
is not included in
val f : 'a -> float
The type 'a -> int is not compatible with the type 'a -> float
Type int is not compatible with type float
|}]
module M : sig
val x : 'a list ref
end = struct
let x = ref []
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let x = ref []
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val x : '_weak2 list ref end
is not included in
sig val x : 'a list ref end
Values do not match:
val x : '_weak2 list ref
is not included in
val x : 'a list ref
The type '_weak2 list ref is not compatible with the type 'a list ref
Type '_weak2 is not compatible with type 'a
|}];;
module M = struct let r = ref [] end;;
type t;;
module N : sig val r : t list ref end = M;;
[%%expect{|
module M : sig val r : '_weak3 list ref end
type t
Line 3, characters 40-41:
3 | module N : sig val r : t list ref end = M;;
^
Error: Signature mismatch:
Modules do not match:
sig val r : '_weak3 list ref end
is not included in
sig val r : t list ref end
Values do not match:
val r : '_weak3 list ref
is not included in
val r : t list ref
The type '_weak3 list ref is not compatible with the type t list ref
The type constructor t would escape its scope
|}];;
type (_, _) eq = Refl : ('a, 'a) eq;;
module T : sig
type t
type s
val eq : (t, s) eq
end = struct
type t = int
type s = int
let eq = Refl
end;;
module M = struct let r = ref [] end;;
let foo p (e : (T.t, T.s) eq) (x : T.t) (y : T.s) =
match e with
| Refl ->
let z = if p then x else y in
let module N = struct
module type S = module type of struct let r = ref [z] end
end in
let module O : N.S = M in
();;
[%%expect{|
type (_, _) eq = Refl : ('a, 'a) eq
module T : sig type t type s val eq : (t, s) eq end
module M : sig val r : '_weak4 list ref end
Line 22, characters 25-26:
22 | let module O : N.S = M in
^
Error: Signature mismatch:
Modules do not match:
sig val r : '_weak4 list ref end
is not included in
N.S
Values do not match:
val r : '_weak4 list ref
is not included in
val r : T.t list ref
The type '_weak4 list ref is not compatible with the type T.t list ref
This instance of T.t is ambiguous:
it would escape the scope of its equation
|}];;
module M: sig
val f : int -> float
end = struct
let f (x : 'a) = x
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : 'a) = x
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : 'a -> 'a end
is not included in
sig val f : int -> float end
Values do not match:
val f : 'a -> 'a
is not included in
val f : int -> float
The type int -> int is not compatible with the type int -> float
Type int is not compatible with type float
|}];;
module M: sig
val f : (int * float * int) -> (int -> int)
end = struct
let f (x : (int * int)) = x
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : (int * int)) = x
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : int * int -> int * int end
is not included in
sig val f : int * float * int -> int -> int end
Values do not match:
val f : int * int -> int * int
is not included in
val f : int * float * int -> int -> int
The type int * int -> int * int is not compatible with the type
int * float * int -> int -> int
Type int * int is not compatible with type int * float * int
|}];;
module M: sig
val f : <m : int; n : float> -> <m : int; n : float>
end = struct
let f (x : <m : int; f : float>) = x
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : <m : int; f : float>) = x
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : < f : float; m : int > -> < f : float; m : int > end
is not included in
sig val f : < m : int; n : float > -> < m : int; n : float > end
Values do not match:
val f : < f : float; m : int > -> < f : float; m : int >
is not included in
val f : < m : int; n : float > -> < m : int; n : float >
The type < f : float; m : int > -> < f : float; m : int >
is not compatible with the type
< m : int; n : float > -> < m : int; n : float >
The second object type has no method f
|}];;
module M : sig
val f : [`Foo] -> unit
end = struct
let f (x : [ `Foo | `Bar]) = ()
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : [ `Foo | `Bar]) = ()
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : [ `Bar | `Foo ] -> unit end
is not included in
sig val f : [ `Foo ] -> unit end
Values do not match:
val f : [ `Bar | `Foo ] -> unit
is not included in
val f : [ `Foo ] -> unit
The type [ `Bar | `Foo ] -> unit is not compatible with the type
[ `Foo ] -> unit
The second variant type does not allow tag(s) `Bar
|}];;
module M : sig
val f : [>`Foo] -> unit
end = struct
let f (x : [< `Foo]) = ()
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : [< `Foo]) = ()
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : [< `Foo ] -> unit end
is not included in
sig val f : [> `Foo ] -> unit end
Values do not match:
val f : [< `Foo ] -> unit
is not included in
val f : [> `Foo ] -> unit
The type [< `Foo ] -> unit is not compatible with the type
[> `Foo ] -> unit
The second variant type is open and the first is not
|}];;
module M : sig
val f : [< `Foo | `Bar] -> unit
end = struct
let f (x : [< `Foo]) = ()
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : [< `Foo]) = ()
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : [< `Foo ] -> unit end
is not included in
sig val f : [< `Bar | `Foo ] -> unit end
Values do not match:
val f : [< `Foo ] -> unit
is not included in
val f : [< `Bar | `Foo ] -> unit
The type [< `Foo ] -> unit is not compatible with the type
[< `Bar | `Foo ] -> unit
The first variant type does not allow tag(s) `Bar
|}];;
module M : sig
val f : < m : [< `Foo]> -> unit
end = struct
let f (x : < m : 'a. [< `Foo] as 'a >) = ()
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : < m : 'a. [< `Foo] as 'a >) = ()
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : < m : 'a. [< `Foo ] as 'a > -> unit end
is not included in
sig val f : < m : [< `Foo ] > -> unit end
Values do not match:
val f : < m : 'a. [< `Foo ] as 'a > -> unit
is not included in
val f : < m : [< `Foo ] > -> unit
The type < m : 'a. [< `Foo ] as 'a > -> unit
is not compatible with the type < m : [< `Foo ] > -> unit
Types for method m are incompatible
|}];;
module M : sig
val f : < m : 'a. [< `Foo] as 'a > -> unit
end = struct
let f (x : < m : [`Foo]>) = ()
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : < m : [`Foo]>) = ()
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : < m : [ `Foo ] > -> unit end
is not included in
sig val f : < m : 'a. [< `Foo ] as 'a > -> unit end
Values do not match:
val f : < m : [ `Foo ] > -> unit
is not included in
val f : < m : 'a. [< `Foo ] as 'a > -> unit
The type < m : [ `Foo ] > -> unit is not compatible with the type
< m : 'a. [< `Foo ] as 'a > -> unit
Types for method m are incompatible
|}];;
module M : sig
val f : [< `C] -> unit
end = struct
let f (x : [< `C of int&float]) = ()
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : [< `C of int&float]) = ()
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : [< `C of int & float ] -> unit end
is not included in
sig val f : [< `C ] -> unit end
Values do not match:
val f : [< `C of int & float ] -> unit
is not included in
val f : [< `C ] -> unit
The type [< `C of & int & float ] -> unit
is not compatible with the type [< `C ] -> unit
Types for tag `C are incompatible
|}];;
module M : sig
val f : [`Foo] -> unit
end = struct
let f (x : [`Foo of int]) = ()
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : [`Foo of int]) = ()
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : [ `Foo of int ] -> unit end
is not included in
sig val f : [ `Foo ] -> unit end
Values do not match:
val f : [ `Foo of int ] -> unit
is not included in
val f : [ `Foo ] -> unit
The type [ `Foo of int ] -> unit is not compatible with the type
[ `Foo ] -> unit
Types for tag `Foo are incompatible
|}];;
module M : sig
val f : [`Foo of int] -> unit
end = struct
let f (x : [`Foo]) = ()
end;;
[%%expect{|
Lines 3-5, characters 6-3:
3 | ......struct
4 | let f (x : [`Foo]) = ()
5 | end..
Error: Signature mismatch:
Modules do not match:
sig val f : [ `Foo ] -> unit end
is not included in
sig val f : [ `Foo of int ] -> unit end
Values do not match:
val f : [ `Foo ] -> unit
is not included in
val f : [ `Foo of int ] -> unit
The type [ `Foo ] -> unit is not compatible with the type
[ `Foo of int ] -> unit
Types for tag `Foo are incompatible
|}];;
module M : sig
val f : [< `Foo | `Bar | `Baz] -> unit
end = struct