Test/dafny0/Modules1.dfy


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

module A imports B {
  class X {
    function Fx(z: Z): int
      requires z != null;
      decreases 5, 4, 3;
    { z.G() }  // fine; this goes to a different module
  }
  datatype Y {
    Cons(int, Y);
    Empty;
  }
}

class C {
  method M() { }
  function F(): int { 818 }
}

method MyMethod() { }

var MyField: int;

module B {
  class Z {
    method K() { }
    function G(): int
      decreases 10, 8, 6;
    { 25 }
  }
}

static function MyFunction(): int { 5 }

class D { }

method Proc0(x: int)
  decreases x;
{
  if (0 <= x) {
    Proc1(x - 1);
  }
}

method Proc1(x: int)
  decreases x;
{
  if (0 <= x) {
    Proc0(x - 1);
  }
}

method Botch0(x: int)
  decreases x;
{
  Botch1(x - 1);  // error: failure to keep termination metric bounded
}

method Botch1(x: int)
  decreases x;
{
  Botch0(x);  // error: failure to decrease termination metric
}