Challenge 8: Kani contracts for SmallSort - #640
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Kani contracts and harnesses for verify-rust-std challenge. Fixes rust-lang#56
Apply rustfmt from ./scripts/check_rustc.sh --bless.
Drop len=9..32 full-unroll proofs, permutation checks, and the insertion_sort loop invariant that made loop-contract checking diverge. Listed functions keep safety and sortedness contracts, verified at length 4.
Match rust-lang rustfmt.toml (style_edition 2024, use_small_heuristics=Max) so the ubuntu upstream_test format check passes.
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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.
Contracts on smallsort internals used by slice sort.
Validation
challenge/08-smallsortscripts/run-kani.sh)Fixes #56
AI/LLM disclosure