fact: Definition value (s: Prog): option Val := match s with | put _ _ v _ => Some v | get _ _ _ => None | skip _ => None | fault _ => None end.
imports: Coq(FunctionalExtensionality Arith Lia) Coq(Arith.Peano_dec Arith.Compare_dec) Coq(Relations.Relation_Operators) Coq(List) Chapar(Predefs)