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// RUN: %dafny /ironDafny /compile:3 /print:"%t.print" /dprint:"%t.dprint" "%s" > "%t"
// RUN: %diff "%s.expect" "%t"
include "Queue.dfyi"
module LIFO exclusively refines Queue {
type Item = int
method Init() returns (q: Queue) {
q := [];
}
method Push(item: Item, q: Queue) returns (q': Queue) {
return [item] + q;
}
method Pop(q: Queue) returns (item: Item, q': Queue)
ensures item == q[0]
{
item := q[0];
q' := q[1..];
}
}
module MainImpl refines MainSpec {
import Q = LIFO
method Main()
{
var q := Q.Init();
q := Q.Push(0, q);
q := Q.Push(1, q);
q := Q.Push(2, q);
var n: int;
n, q := Q.Pop(q);
print n, "\n";
n, q := Q.Pop(q);
print n, "\n";
n, q := Q.Pop(q);
print n, "\n";
}
}
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