Update to latest Verus (2026-08-23) - #58
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Pull request overview
This PR refactors the proof obligations around untrusted_append_success to reduce verification timeouts by separating “data write” state from “header update” state and adding intermediate lemmas to bridge the two.
Changes:
- Extends
lemma_append_ib_updateto take an additionalpm_after_data_writesnapshot and rewrites its data-layout preconditions to usepm_to_views(...).2subranges. - Adds proof steps inside
lemma_append_ib_updatethat use a new, range-specificlemma_subrange_eqto transfer data subrange facts across the header update. - Captures
wrpm@aspm_after_data_writebeforeupdate_headerand updates the lemma call accordingly.
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Jay Lorch (jaylorch)
marked this pull request as draft
August 24, 2026 16:59
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Jay Lorch (jaylorch)
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untrusted_append_success
Jay Lorch (jaylorch)
marked this pull request as ready for review
August 24, 2026 18:23
Jay Lorch (jaylorch)
changed the title
Hayley LeBlanc (hayley-leblanc)
approved these changes
Aug 25, 2026
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This PR updates the projects to use the latest Verus.
The most significant change is because I noticed the nightly run of verita was flagging
untrusted_append_successas failing due to timeout. So I enlisted the aid of GPT-5.6 Sol to make that lemma more robust.