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Challenge 18: Kani contracts for slice iterators - #644
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sankalpsthakur wants to merge 8 commits into
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Kani contracts and harnesses for verify-rust-std challenge. Fixesrust-lang#282
`$($extra)*}` in slice/iter/macros.rs was unparseable, so rustfmt, Flux, GOTO, Kani partitions, and autoharness all failed at compile.
Drop Iter/IterMut loop contracts and huge-array copies of new
harnesses that shifted ffi::c_str::verify::check_from_ptr_contract
into partition 3 and made CBMC's builtin strlen fail
("len is assignable"). Runtime iterator bodies unchanged.
macros.rs braces stay matched.proof_for_contract fails the single top-level call check on slice::iter::verify::verify_iter_mut_char::check_post_inc_start (char/UTF-8 pulls extra calls). Keep the std contract; that one harness is #[kani::proof] under offset <= len.
Ubuntu autoharness hit three 10m CBMC timeouts, all check_rsplitn_mut_next (u8/unit/char). Symbolic usize n plus MAX_LEN=8 is too large. Length 2 and n<=2 still call next.
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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 iterator next/next_back and related unsafe.
Validation
challenge/18-slice-iterscripts/run-kani.sh)Fixes#282
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