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// ----------- BEGIN PRELUDE
var Heap: [ref, name]int;
const N: name;
procedure Q0()
{
var h: int;
entry:
goto Else;
Then:
h := 15;
goto end;
Else:
assume h == 0;
goto end;
end:
assert 0 <= h;
return;
}
procedure Q1()
{
var h: int;
entry:
goto Else;
Then:
h := -15;
goto end;
Else:
assume h == 0;
goto end;
end:
h := -h;
assert 0 <= h;
return;
}
procedure P0(this: ref)
modifies Heap;
{
entry:
goto Else;
Then:
Heap[this, N] := 15;
goto end;
Else:
assume Heap[this, N] == 0;
goto end;
end:
assert 0 <= Heap[this, N];
return;
}
procedure P1(this: ref)
modifies Heap;
{
entry:
goto Else;
Then:
Heap[this, N] := -15;
goto end;
Else:
assume Heap[this, N] == 0;
goto end;
end:
Heap[this, N] := -Heap[this, N];
assert 0 <= Heap[this, N];
return;
}
type name, ref;
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