(* TEST
   * expect
*)

type r = R of r list [@@unboxed]
let rec a = R [a];;
[%%expect{|
type r = R of r list [@@unboxed]
val a : r = R [<cycle>]
|}];;


type t = {x: int64} [@@unboxed]
let rec x = {x = y} and y = 3L;;
[%%expect{|
type t = { x : int64; } [@@unboxed]
Line 2, characters 12-19:
2 | let rec x = {x = y} and y = 3L;;
                ^^^^^^^
Error: This kind of expression is not allowed as right-hand side of `let rec'
|}];;

type r = A of r [@@unboxed]
let rec y = A y;;
[%%expect{|
type r = A of r [@@unboxed]
Line 2, characters 12-15:
2 | let rec y = A y;;
                ^^^
Error: This kind of expression is not allowed as right-hand side of `let rec'
|}];;

(* This test is not allowed if 'a' is unboxed, but should be accepted
   as written *)
type a = {a: b}
and b = X of a | Y

let rec a =
  {a=
    (if Sys.opaque_identity true then
       X a
     else
       Y)};;
[%%expect{|
type a = { a : b; }
and b = X of a | Y
val a : a = {a = X <cycle>}
|}];;

type a = {a: b }[@@unboxed]
and b = X of a | Y

let rec a =
  {a=
    (if Sys.opaque_identity true then
       X a
     else
       Y)};;
[%%expect{|
type a = { a : b; } [@@unboxed]
and b = X of a | Y
Lines 5-9, characters 2-10:
5 | ..{a=
6 |     (if Sys.opaque_identity true then
7 |        X a
8 |      else
9 |        Y)}..
Error: This kind of expression is not allowed as right-hand side of `let rec'
|}];;

(* This test is not allowed if 'c' is unboxed, but should be accepted
   as written *)
type d = D of e
and e = V of d | W;;
[%%expect{|
type d = D of e
and e = V of d | W
|}];;

let rec d =
  D
    (if Sys.opaque_identity true then
       V d
     else
       W);;
[%%expect{|
val d : d = D (V <cycle>)
|}];;

type d = D of e [@@unboxed]
and e = V of d | W;;

let rec d =
  D
    (if Sys.opaque_identity true then
       V d
     else
       W);;
[%%expect{|
type d = D of e [@@unboxed]
and e = V of d | W
Lines 5-9, characters 2-9:
5 | ..D
6 |     (if Sys.opaque_identity true then
7 |        V d
8 |      else
9 |        W)..
Error: This kind of expression is not allowed as right-hand side of `let rec'
|}];;