BMC: implement weak/strong sequences #1070
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Cases relating to sequence expressions are now fully handled in property_obligations_rec.
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This implements strong semantics for SVA sequences in the word-level BMC engine. Strong semantics are used with an explicit strong(...) operator or for SVA cover. The difference between weak and strong semantics arises in BMC when the sequence reaches the end of the unwinding: using weak semantics, the sequence matches, whereas using strong semantics the sequence does not.
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This implements strong semantics for SVA sequences in the word-level BMC engine. Strong semantics are used with an explicit
strong(...)operator or for SVAcover.The difference between weak and strong semantics arises in BMC when the sequence reaches the end of the unwinding: using weak semantics, the sequence matches, whereas using strong semantics the sequence does not.