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// Concrete language syntax for a Dafny extension with refinement.
// 6/28/2010
class A {
var n : int;
method Init() modifies this;
{ n := 0;}
method Inc() modifies this;
{ n := n + 1;}
method Dec()
modifies this;
requires n > 0;
{ n := n - 1;}
method Test1(p: int) returns (i: int)
{
assume true;
}
method Test2() returns (o: object)
{ o := this; }
}
class B refines A {
var inc : int, dec : int;
replaces n by n == inc - dec;
// transforms n into inc - dec;
refines Init() modifies this;
{ inc := 0; dec := 0;}
refines Inc() modifies this;
{ inc := inc + 1; }
refines Dec()
modifies this;
requires inc > dec;
{ dec := dec + 1; }
refines Test1(p: int) returns (i: int)
{
i := p;
}
}
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