Challenge 17: Kani contracts for slice functions - #647
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Kani contracts and harnesses for verify-rust-std challenge. Fixes rust-lang#281
Apply rust-lang rustfmt (use_small_heuristics = Max) to the slice files from this challenge so upstream_test format passes.
Overflow-safe invariants and loop_modifies so check_binary_search_by and check_partition_dedup_by verify.
Autoharness ubuntu ended with runner shutdown after 1h11m, not a Kani counterexample.
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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.
Slice module unsafe operations.
Validation
challenge/17-slicescripts/run-kani.sh)Fixes #281
AI/LLM disclosure