Revert "A simple test case for dafny set" #190
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amerikrainian
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The verifier fails in set.dfy:10 because {y - x + 1} isn’t known to be a nat (e.g., x=3, y=0 makes the element -2). With no axioms, that subset obligation can’t be discharged from the proof file alone.
MichaelHenryJennings
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Agreed, this test case is unverifiable under our system.
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Reverts #173