Commit 6de81061 authored by David Swasey's avatar David Swasey
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Added (optional) safety. It's optional for my work on security

protocols where I want to prove something called robust safety.
Ironically, to even state robust safety requires Hoare triples that
don't imply safety. So Iris supports both {P} e {Q} (implying safety)
and [P] e [Q] (not). I'll add a rule for forgetting about safety:

	{P} e {Q}
	— Unsafe
	[P] e [Q]

some time soon.

Aside: I'm an SSReflect weenie and know next to nothing about the
usual Coq tactics. My proof script changes likely reflect that fact.
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