fix(bolero-kani): use cover instead of assume #190
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We currently use
kani::assume(was_valid)on the generator result. This isn't really what we want, since kani won't actually fail the proof if an assumption is unsatisfiable; see model-checking/kani#2693.Instead, the
cover!macro is somewhat closer to what we want. It at least reports if thewas_validvariable was ever true. Ideally, it would fail the proof so I've opened an issue for that: model-checking/kani#2792.