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The BI interface is then instantiated using these laws.  In particular, this
shows that the rules we claim to be admissible actually are.

Fixes #193

Show that atomic_step is an AccElim so we can open invariants; get entirely rid of the Em ⊆ Eo side-condition

New atomic updates: defined as a fixed point with existential quantifier; intro lemma using class of Laterable assertions

If the BI is not affine, this should not happen, as it may lead to
information loss.

This commit fixes issue #190.

Thanks to @dfrumin.

These instances are the same as those for e.g. the later modality.

There's a very low risk of these conflicting with Coq's standard library

This version allows one to either close or cancel the invariant after opening it.

These results turned out to be neither that useful nor canonical, and can easily
be derived from local updates.

This reverts commit 465dd9f4.

Thanks to @jung for proposing these names.

This fixes issue #187.

move test suite out of theories/ so it does not get installed; also check output of test suite so that we can test printing