(* TEST
 expect;
*)

(*** Record ***)

(* Expressions *)

module M = struct
  type r = { lbl : int }
end
;;
[%%expect{|
module M : sig type r = { lbl : int; } end
|}]

let before_a : M.r =
  { lbl = 3 }
;;
[%%expect{|
val before_a : M.r = {M.lbl = 3}
|}]

let a =
  let x = ({ M.lbl = 3 } : M.r) in
  x.lbl
;;
[%%expect{|
val a : int = 3
|}]

let after_a =
  let x = ({ M.lbl = 3 } : M.r) in
  { x with lbl = 4 }
;;
[%%expect{|
Line 3, characters 2-20:
3 |   { x with lbl = 4 }
      ^^^^^^^^^^^^^^^^^^
Warning 23 [useless-record-with]: all the fields are explicitly listed in this record:
the 'with' clause is useless.

val after_a : M.r = {M.lbl = 4}
|}]

let b =
  let x = ({ contents = { M.lbl = 3 } } : M.r ref) in
  x := { lbl = 4 }
;;
[%%expect{|
val b : unit = ()
|}, Principal{|
Line 3, characters 7-18:
3 |   x := { lbl = 4 }
           ^^^^^^^^^^^
Warning 18 [not-principal]: this type-based record disambiguation is not principal.

val b : unit = ()
|}]

let c =
  let x = ({ contents = { M.lbl = 3 } } : M.r ref) in
  !x.lbl
;;
[%%expect{|
val c : int = 3
|}]

let d =
  let x = ({ contents = { M.lbl = 3 } } : M.r ref) in
  x.contents <- { lbl = 4 }
;;
[%%expect{|
val d : unit = ()
|}]

let e =
  let x = ({ contents = { M.lbl = 3 } } : M.r ref) in
  { x with contents = { lbl = 4 } }
;;
[%%expect{|
Line 3, characters 24-27:
3 |   { x with contents = { lbl = 4 } }
                            ^^^
Error: Unbound record field lbl
|}]

let f =
  let x = ({ contents = { M.lbl = 3 } } : M.r ref) in
  x.contents.lbl
;;
[%%expect{|
val f : int = 3
|}]

(* Patterns *)

let g (x : M.r) =
  match x with
  | { lbl = _ } -> ()
;;
[%%expect{|
val g : M.r -> unit = <fun>
|}]

let h x =
  match x with
  | (_ : M.r) -> ()
  | { lbl = _ } -> ()
;;
[%%expect{|
Line 4, characters 4-15:
4 |   | { lbl = _ } -> ()
        ^^^^^^^^^^^
Warning 11 [redundant-case]: this match case is unused.

val h : M.r -> unit = <fun>
|}, Principal{|
Line 4, characters 4-15:
4 |   | { lbl = _ } -> ()
        ^^^^^^^^^^^
Warning 18 [not-principal]: this type-based record disambiguation is not principal.

Line 4, characters 4-15:
4 |   | { lbl = _ } -> ()
        ^^^^^^^^^^^
Warning 11 [redundant-case]: this match case is unused.

val h : M.r -> unit = <fun>
|}]

let i x =
  match x with
  | { lbl = _ } -> ()
  | (_ : M.r) -> ()
;;
[%%expect{|
Line 3, characters 6-9:
3 |   | { lbl = _ } -> ()
          ^^^
Error: Unbound record field lbl
|}]

let j x =
  match x with
  | (_ : M.r)
  | { lbl = _ } -> ()
;;
[%%expect{|
Line 4, characters 4-15:
4 |   | { lbl = _ } -> ()
        ^^^^^^^^^^^
Warning 12 [redundant-subpat]: this sub-pattern is unused.

val j : M.r -> unit = <fun>
|}, Principal{|
Line 4, characters 4-15:
4 |   | { lbl = _ } -> ()
        ^^^^^^^^^^^
Warning 18 [not-principal]: this type-based record disambiguation is not principal.

Line 4, characters 4-15:
4 |   | { lbl = _ } -> ()
        ^^^^^^^^^^^
Warning 12 [redundant-subpat]: this sub-pattern is unused.

val j : M.r -> unit = <fun>
|}]

let k x =
  match x with
  | { lbl = _ }
  | (_ : M.r) -> ()
;;
[%%expect{|
Line 3, characters 6-9:
3 |   | { lbl = _ }
          ^^^
Error: Unbound record field lbl
|}]

let l (x : M.r ref) =
  match x with
  | { contents = { lbl = _ } } -> ()
;;
[%%expect{|
val l : M.r ref -> unit = <fun>
|}]

let m x =
  match x with
  | { contents = { lbl = _ } } -> ()
;;
[%%expect{|
Line 3, characters 19-22:
3 |   | { contents = { lbl = _ } } -> ()
                       ^^^
Error: Unbound record field lbl
|}]

let n x =
  match x with
  | (_ : M.r ref) -> ()
  | { contents = { lbl = _ } } -> ()
;;
[%%expect{|
Line 4, characters 4-30:
4 |   | { contents = { lbl = _ } } -> ()
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
Warning 11 [redundant-case]: this match case is unused.

val n : M.r ref -> unit = <fun>
|}, Principal{|
Line 4, characters 17-28:
4 |   | { contents = { lbl = _ } } -> ()
                     ^^^^^^^^^^^
Warning 18 [not-principal]: this type-based record disambiguation is not principal.

Line 4, characters 4-30:
4 |   | { contents = { lbl = _ } } -> ()
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
Warning 11 [redundant-case]: this match case is unused.

val n : M.r ref -> unit = <fun>
|}]

let o x =
  match x with
  | { contents = { lbl = _ } } -> ()
  | (_ : M.r ref) -> ()
;;
[%%expect{|
Line 3, characters 19-22:
3 |   | { contents = { lbl = _ } } -> ()
                       ^^^
Error: Unbound record field lbl
|}]

let p x =
  match x with
  | (_ : M.r ref)
  | { contents = { lbl = _ } } -> ()
;;
[%%expect{|
Line 4, characters 4-30:
4 |   | { contents = { lbl = _ } } -> ()
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
Warning 12 [redundant-subpat]: this sub-pattern is unused.

val p : M.r ref -> unit = <fun>
|}, Principal{|
Line 4, characters 17-28:
4 |   | { contents = { lbl = _ } } -> ()
                     ^^^^^^^^^^^
Warning 18 [not-principal]: this type-based record disambiguation is not principal.

Line 4, characters 4-30:
4 |   | { contents = { lbl = _ } } -> ()
        ^^^^^^^^^^^^^^^^^^^^^^^^^^
Warning 12 [redundant-subpat]: this sub-pattern is unused.

val p : M.r ref -> unit = <fun>
|}]

let q x =
  match x with
  | { contents = { lbl = _ } }
  | (_ : M.r ref) -> ()
;;
[%%expect{|
Line 3, characters 19-22:
3 |   | { contents = { lbl = _ } }
                       ^^^
Error: Unbound record field lbl
|}]

let r arg =
  match arg with
  | (x : M.r ref) ->
    !x.lbl
;;
[%%expect{|
val r : M.r ref -> int = <fun>
|}]

let s arg =
  match arg with
  | (x : M.r ref) ->
    x := { lbl = 4 }
;;
[%%expect{|
val s : M.r ref -> unit = <fun>
|}, Principal{|
Line 4, characters 9-20:
4 |     x := { lbl = 4 }
             ^^^^^^^^^^^
Warning 18 [not-principal]: this type-based record disambiguation is not principal.

val s : M.r ref -> unit = <fun>
|}]

let t = function
  | ({ contents = { M.lbl = _ } } : M.r ref) as x ->
    x := { lbl = 4 }
;;
[%%expect{|
val t : M.r ref -> unit = <fun>
|}, Principal{|
Line 3, characters 9-20:
3 |     x := { lbl = 4 }
             ^^^^^^^^^^^
Warning 18 [not-principal]: this type-based record disambiguation is not principal.

val t : M.r ref -> unit = <fun>
|}]

let u = function
  | ({ contents = { M.lbl = _ } } : M.r ref) as x ->
    !x.lbl
;;
[%%expect{|
val u : M.r ref -> int = <fun>
|}]


(*** Constructors ***)

(* Expressions *)

module M = struct
  type t = A | B
end
;;
[%%expect{|
module M : sig type t = A | B end
|}]

let before_a : M.t =
  A
;;
[%%expect{|
val before_a : M.t = M.A
|}]

let a =
  let x = (A : M.t) in
  x
;;
[%%expect{|
val a : M.t = M.A
|}]

let b =
  let x = ({ contents = A } : M.t ref) in
  x := B
;;
[%%expect{|
val b : unit = ()
|}, Principal{|
Line 3, characters 7-8:
3 |   x := B
           ^
Warning 18 [not-principal]: this type-based constructor disambiguation is not principal.

val b : unit = ()
|}]

let d =
  let x = ({ contents = A } : M.t ref) in
  x.contents <- B
;;
[%%expect{|
val d : unit = ()
|}]

let e =
  let x = ({ contents = A } : M.t ref) in
  { x with contents = B }
;;
[%%expect{|
Line 3, characters 22-23:
3 |   { x with contents = B }
                          ^
Error: Unbound constructor B
|}]

(* Patterns *)

let g (x : M.t) =
  match x with
  | A | B  -> ()
;;
[%%expect{|
val g : M.t -> unit = <fun>
|}]

let h x =
  match x with
  | (A : M.t) -> ()
  | B -> ()
;;
[%%expect{|
val h : M.t -> unit = <fun>
|}, Principal{|
Line 4, characters 4-5:
4 |   | B -> ()
        ^
Warning 18 [not-principal]: this type-based constructor disambiguation is not principal.

val h : M.t -> unit = <fun>
|}]

let i x =
  match x with
  | A -> ()
  | (B : M.t) -> ()
;;
[%%expect{|
Line 3, characters 4-5:
3 |   | A -> ()
        ^
Error: Unbound constructor A
|}]

let j x =
  match x with
  | (A : M.t)
  | B -> ()
;;
[%%expect{|
val j : M.t -> unit = <fun>
|}, Principal{|
Line 4, characters 4-5:
4 |   | B -> ()
        ^
Warning 18 [not-principal]: this type-based constructor disambiguation is not principal.

val j : M.t -> unit = <fun>
|}]

let k x =
  match x with
  | A
  | (B : M.t) -> ()
;;
[%%expect{|
Line 3, characters 4-5:
3 |   | A
        ^
Error: Unbound constructor A
|}]

let l (x : M.t ref) =
  match x with
  | { contents = (A | B) } -> ()
;;
[%%expect{|
val l : M.t ref -> unit = <fun>
|}]

let m x =
  match x with
  | { contents = (A | B) } -> ()
;;
[%%expect{|
Line 3, characters 18-19:
3 |   | { contents = (A | B) } -> ()
                      ^
Error: Unbound constructor A
|}]

let n x =
  match x with
  | (_ : M.t ref) -> ()
  | { contents = A } -> ()
;;
[%%expect{|
Line 4, characters 4-20:
4 |   | { contents = A } -> ()
        ^^^^^^^^^^^^^^^^
Warning 11 [redundant-case]: this match case is unused.

val n : M.t ref -> unit = <fun>
|}, Principal{|
Line 4, characters 17-18:
4 |   | { contents = A } -> ()
                     ^
Warning 18 [not-principal]: this type-based constructor disambiguation is not principal.

Line 4, characters 4-20:
4 |   | { contents = A } -> ()
        ^^^^^^^^^^^^^^^^
Warning 11 [redundant-case]: this match case is unused.

val n : M.t ref -> unit = <fun>
|}]

let o x =
  match x with
  | { contents = A } -> ()
  | (_ : M.t ref) -> ()
;;
[%%expect{|
Line 3, characters 17-18:
3 |   | { contents = A } -> ()
                     ^
Error: Unbound constructor A
|}]

let p x =
  match x with
  | (_ : M.t ref)
  | { contents = A } -> ()
;;
[%%expect{|
Line 4, characters 4-20:
4 |   | { contents = A } -> ()
        ^^^^^^^^^^^^^^^^
Warning 12 [redundant-subpat]: this sub-pattern is unused.

val p : M.t ref -> unit = <fun>
|}, Principal{|
Line 4, characters 17-18:
4 |   | { contents = A } -> ()
                     ^
Warning 18 [not-principal]: this type-based constructor disambiguation is not principal.

Line 4, characters 4-20:
4 |   | { contents = A } -> ()
        ^^^^^^^^^^^^^^^^
Warning 12 [redundant-subpat]: this sub-pattern is unused.

val p : M.t ref -> unit = <fun>
|}]

let q x =
  match x with
  | { contents = A }
  | (_ : M.t ref) -> ()
;;
[%%expect{|
Line 3, characters 17-18:
3 |   | { contents = A }
                     ^
Error: Unbound constructor A
|}]

let s arg =
  match arg with
  | (x : M.t ref) ->
    x := A
;;
[%%expect{|
val s : M.t ref -> unit = <fun>
|}, Principal{|
Line 4, characters 9-10:
4 |     x := A
             ^
Warning 18 [not-principal]: this type-based constructor disambiguation is not principal.

val s : M.t ref -> unit = <fun>
|}]

let t = function
  | ({ contents = M.A } : M.t ref) as x ->
    x := B
;;
[%%expect{|
Lines 1-3, characters 8-10:
1 | ........function
2 |   | ({ contents = M.A } : M.t ref) as x ->
3 |     x := B
Warning 8 [partial-match]: this pattern-matching is not exhaustive.
Here is an example of a case that is not matched:
{contents=B}

val t : M.t ref -> unit = <fun>
|}, Principal{|
Line 3, characters 9-10:
3 |     x := B
             ^
Warning 18 [not-principal]: this type-based constructor disambiguation is not principal.

Lines 1-3, characters 8-10:
1 | ........function
2 |   | ({ contents = M.A } : M.t ref) as x ->
3 |     x := B
Warning 8 [partial-match]: this pattern-matching is not exhaustive.
Here is an example of a case that is not matched:
{contents=B}

val t : M.t ref -> unit = <fun>
|}]