Later Credits: A Case Study in the Unreasonable Effectiveness of Separation ...
summary
Presents a concrete mechanism inside Iris that turns the later modality into an ownable resource called later credits, letting a step produce a credit and letting a proof spend it to strip a later. Demonstrates this solves the nested-invariant and unsolicited helping obstacles caused by step indexing, yields a prepaid invariant variant that removes laters from the invariant rule, and reports the design is implemented in Iris and already used in systems verification papers (OSDI/SOSP) since about two years ago.
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