Consistency checks to forbid inhale-exhale-assertions in function preconditions and predicate bodies #828
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…ion preconditions and predicate bodies
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This PR adds consistency checks that forbid inhale-exhale assertions in predicate bodies and in function preconditions. Currently, Silicon raises an internal error when it encounters these (see viperproject/silicon#271), whereas Carbon just accepts them.
I think the semantics is at the very least completely unclear and probably doesn't make sense at all, which is why this PR forbids this situation for now. However, this obviously needs to be discussed first, so this PR should not be merged before it's been discussed in a Viper meeting.