Challenge 22: Kani contracts for str iterators - #646
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Kani contracts and harnesses for verify-rust-std challenge. Fixes rust-lang#279
Apply rustfmt from ./scripts/check_rustc.sh --bless.
Restore original Chars::advance_by loops and cap haystacks at 5 bytes so autoharness stays inside the 10m timeout. Keep safety contracts and proof_for_contract harnesses for the challenge functions. Fixes rust-lang#279
Match check_rustc rustfmt (compact struct literals).
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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.
str iterator UTF-8 boundary safety.
Validation
challenge/22-str-iterscripts/run-kani.sh)Fixes #279
AI/LLM disclosure