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Challenge 17: Kani contracts for slice functions - #647
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sankalpsthakur wants to merge 6 commits into
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Kani contracts and harnesses for verify-rust-std challenge. Fixesrust-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.
CAP=8 plus symbolic mid times out autoharness's 10m CBMC cap on ptr_rotate, rotate_left, rotate_right, and swap_with_slice (1423/4). Fixed length 2 still runs the real memmove / swap_nonoverlapping path.
GOTO codegen failed E0502: rotate_left/right mut-borrow arr while any_where reads arr.len() in the same argument. Snapshot len first.
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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