1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
(* TEST
* expect
*)
module rec A: sig val x: int end = struct let x = B.x end
and B:sig val x: int end = struct let x = E.y end
and C:sig val x: int end = struct let x = B.x end
and D:sig val x: int end = struct let x = C.x end
and E:sig val x: int val y:int end = struct let x = D.x let y = 0 end
[%%expect {|
Line 2, characters 27-49:
2 | and B:sig val x: int end = struct let x = E.y end
^^^^^^^^^^^^^^^^^^^^^^
Error: Cannot safely evaluate the definition of the following cycle
of recursively-defined modules: B -> E -> D -> C -> B.
There are no safe modules in this cycle (see manual section 12.2).
Line 2, characters 10-20:
2 | and B:sig val x: int end = struct let x = E.y end
^^^^^^^^^^
Module B defines an unsafe value, x .
Line 5, characters 10-20:
5 | and E:sig val x: int val y:int end = struct let x = D.x let y = 0 end
^^^^^^^^^^
Module E defines an unsafe value, x .
Line 4, characters 10-20:
4 | and D:sig val x: int end = struct let x = C.x end
^^^^^^^^^^
Module D defines an unsafe value, x .
Line 3, characters 10-20:
3 | and C:sig val x: int end = struct let x = B.x end
^^^^^^^^^^
Module C defines an unsafe value, x .
|}]
type t = ..
module rec A: sig type t += A end = struct type t += A = B.A end
and B:sig type t += A end = struct type t += A = A.A end
[%%expect {|
type t = ..
Line 2, characters 36-64:
2 | module rec A: sig type t += A end = struct type t += A = B.A end
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error: Cannot safely evaluate the definition of the following cycle
of recursively-defined modules: A -> B -> A.
There are no safe modules in this cycle (see manual section 12.2).
Line 2, characters 28-29:
2 | module rec A: sig type t += A end = struct type t += A = B.A end
^
Module A defines an unsafe extension constructor, A .
Line 3, characters 20-21:
3 | and B:sig type t += A end = struct type t += A = A.A end
^
Module B defines an unsafe extension constructor, A .
|}]
module rec A: sig
module F: functor(X:sig end) -> sig end
val f: unit -> unit
end = struct
module F(X:sig end) = struct end
let f () = B.value
end
and B: sig val value: unit end = struct let value = A.f () end
[%%expect {|
Lines 4-7, characters 6-3:
4 | ......struct
5 | module F(X:sig end) = struct end
6 | let f () = B.value
7 | end
Error: Cannot safely evaluate the definition of the following cycle
of recursively-defined modules: A -> B -> A.
There are no safe modules in this cycle (see manual section 12.2).
Line 2, characters 2-41:
2 | module F: functor(X:sig end) -> sig end
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Module A defines an unsafe functor, F .
Line 8, characters 11-26:
8 | and B: sig val value: unit end = struct let value = A.f () end
^^^^^^^^^^^^^^^
Module B defines an unsafe value, value .
|}]
module F(X: sig module type t module M: t end) = struct
module rec A: sig
module M: X.t
val f: unit -> unit
end = struct
module M = X.M
let f () = B.value
end
and B: sig val value: unit end = struct let value = A.f () end
end
[%%expect {|
Lines 5-8, characters 8-5:
5 | ........struct
6 | module M = X.M
7 | let f () = B.value
8 | end
Error: Cannot safely evaluate the definition of the following cycle
of recursively-defined modules: A -> B -> A.
There are no safe modules in this cycle (see manual section 12.2).
Line 3, characters 4-17:
3 | module M: X.t
^^^^^^^^^^^^^
Module A defines an unsafe module, M .
Line 9, characters 13-28:
9 | and B: sig val value: unit end = struct let value = A.f () end
^^^^^^^^^^^^^^^
Module B defines an unsafe value, value .
|}]
module rec M: sig val f: unit -> int end = struct let f () = N.x end
and N:sig val x: int end = struct let x = M.f () end;;
[%%expect {|
Exception: Undefined_recursive_module ("", 1, 43).
|}]
|
