But this is exactly the point - if you forgot about proving `ToBytes(FromBytes(bs)) == bs`, forgot about this edge case, and later tried to prove a function that implicitly relied on that fact - Dafny would let you know!
If I autogenerated a huge amount of C based on the weights, that added/multipled variables the same way the existing code+weights does, then would it be “source”?
But this is exactly the point - if you forgot about proving `ToBytes(FromBytes(bs)) == bs`, forgot about this edge case, and later tried to prove a function that implicitly relied on that fact - Dafny would let you know!