Replace s[var]!! notation with GetElem instance
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implement GetElem instance for state and identifier so we can use the standard `s[var]` notation instead of the double exclamation mark. Needed to add some lemmas, so that everything still compiles, for instance so that we can use string literals in place of identifiers and connecting lemmas between the two instances Also added the new lemmas to the clr_varstore tactic so it can handle the example case of peano.
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implement two new instances
so we can use the standard
s[var]notation (along with its!and?versions).The condition for validity is simply
Trueas variables are all initialized with a default value of0.Perhaps this should check that the state is not
OutOfFuel?Needed to add some lemmas, so that everything still compiles, for instance so that we can use string literals in place of identifiers and connecting lemmas between the two instances Also added the new lemmas to the
clr_varstoretactic so it can handle the example case of peano.