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
|
abstype t = T
with
val eq = op =
end
val _ = eq (3, 3)
abstype t = T
with
val t = T
val eq = op =
end
val _ = eq (t, t)
abstype t = T
with
val t = T
val eq = op =
val _ = eq (t, t)
end
val _ = eq (2, 3)
abstype t = T
with
val t = T
val eq = op =
val _ = eq (t, t)
end
val _ = eq (t, t)
abstype t = T
with
val t = T
val eq = op =
val _ = eq (t, t) andalso eq (2, 3)
end
val _ = eq (2, 3)
(* with abstype *)
structure S =
struct
abstype s = S
with
val a = S
end
end
signature F =
sig
val b : S.s
end
functor F() : F =
struct
type s = S.s
val b = S.a
end
functor K() =
struct
structure F = F()
end
structure K = K()
(* abstype.sml *)
(* Checks equality inferred for abstype environments. *)
abstype t = T with
datatype u = U of t
val eq = op=
end
fun eq1(t1, t2) = U t1 = U t2;
fun eq2(t1, t2 : t) = eq(t1, t2);
|
