Challenge 4: Kani contracts for BTreeMap node - #641
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Kani contracts and harnesses for verify-rust-std challenge. Fixes rust-lang#77
Drop the duplicate super imports that failed rustc fmt. Build symbolic leaves without nested Handle::new_kv so the contract proof has a single top-level call. Replace n+count in any_where predicates with saturating_sub so Kani does not fail on usize overflow.
Drop the weak loop_invariant that havocs SplitResult node pointers into unconstrained values. Copy leaf occupancy with ptr::copy so insert_recursing proofs can use unwind 3 instead of 13.
Partition 1 and autoharness ubuntu ended with runner shutdown, not a Kani counterexample.
Autoharness macos timed out (10m CBMC) on check_insert_recursing_into_parent. Use a concrete edge index and key so the Ok(parent) / split_root arms still run without a symbolic idx.
Autoharness 5aca52c was 1411/1/1412: into_parent still hit the 10m CBMC cap (17:53-18:03). split_root and fit passed. unwind(3) lets CBMC havoc a second parent hop; one hop plus exit is unwind(2).
Autoharness both OS 0-fail on 86a25d9 (ubuntu 1413/0, macos 1412/0). ubuntu partition 1 was shutdown-signal with 0 VERIFICATION FAILED. gh run rerun --failed denied (no admin).
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Withdrawing this; no maintainer signal and we are cutting the queue. |
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Summary
Kani safety contracts and proof harnesses for this challenge. Runtime stdlib logic is unchanged; annotations are cfg(kani) / contract attributes.
Memory-safety contracts on btree::node.
Validation
challenge/04-btree-nodescripts/run-kani.sh)Fixes #77
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