blob: 44add7cc344d96a389bb2520bc9487f40f3e99ba (
plain)
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
|
// RUN: %dafny /ironDafny /compile:3 /print:"%t.print" /dprint:"%t.dprint" "%s" > "%t"
// RUN: %diff "%s.expect" "%t"
abstract module AlphaSpec {
type Alpha
predicate IsValid(a:Alpha)
method Init() returns (a:Alpha)
ensures IsValid(a);
}
abstract module BetaSpec {
type Beta
import A as AlphaSpec
predicate IsValid(b:Beta)
method Init(ays:seq<A.Alpha>) returns (b:Beta)
requires forall i :: 0 <= i < |ays| ==> A.IsValid(ays[i]);
ensures IsValid(b);
}
module AlphaImpl exclusively refines AlphaSpec {
type Alpha = bool
predicate IsValid(a:Alpha) {
a
}
method Init() returns (a:Alpha)
ensures IsValid(a);
{
a := true;
}
}
module BetaImpl exclusively refines BetaSpec {
import A = AlphaImpl
type Beta = seq<A.Alpha>
predicate IsValid(b:Beta) {
forall i :: 0 <= i < |b| ==> A.IsValid(b[i])
}
method Init(ays:seq<A.Alpha>) returns (b:Beta) {
b := ays;
}
}
abstract module MainSpec {
import A as AlphaSpec
import B as BetaSpec
method Main()
{
var a := A.Init();
var ays := [a, a];
assert forall i :: 0 <= i < |ays| ==> A.IsValid(ays[i]);
var b := B.Init(ays);
print "o hai!\n";
}
}
module MainImpl exclusively refines MainSpec {
import B = BetaImpl
import A = AlphaImpl
}
|