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[Civl] Add support for preconditions to actions (#872)
This PR adds preconditions to actions for the purpose of providing extra contextual information in left mover checks for inductive sequentialization. These preconditions are proved to be interference-free just like other preconditions. Their initiation is established by the IS invariant during the step condition check for the action being moved left. As a result of this enhancement, the use of abstractions (and the eliminates clause) is eliminated from Civl benchmarks, the strengthening achieved by the extra gates of the abstractions now achieved by the preconditions. The intention is to eliminate abstractions and the eliminates clause from Civl. But that will be done in a separate PR. --------- Co-authored-by: Shaz Qadeer <[email protected]>
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