Challenge 12: Verify safety of NonZero#565
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Samuelsills wants to merge 1 commit intomodel-checking:mainfrom
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Challenge 12: Verify safety of NonZero#565Samuelsills wants to merge 1 commit intomodel-checking:mainfrom
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Verify all 38 NonZero functions listed in the challenge specification. 432 Kani proof harnesses across all 12 integer types, 0 failures. Resolves model-checking#71 By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.
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Summary
Verify all 38 NonZero functions listed in Challenge 12. 432 Kani proof harnesses across all 12 integer types, 0 failures.
Part 1: Harnesses for
new(iff + value equality assertions) andfrom_mut(iff + dereference). Pre-existing contracts and harnesses fornew_uncheckedandfrom_mut_unchecked.Part 2: Harnesses for all 34 listed functions including bitor (3 impls), count_ones, rotate_left/right, swap_bytes, reverse_bits, endianness conversions, checked/saturating mul/pow/add, checked_next_power_of_two, midpoint, isqrt, abs variants (6), and neg variants (4).
Strengthened loop invariant on
checked_powinuint_macros.rsandint_macros.rsfromtrueto a property that preserves the nonzero invariant through loop iterations. This is a verification-only annotation (no-op at runtime).absandnegharnesses excludeT::MIN(documented overflow behavior). The MIN case is separately verified bywrapping_abs,overflowing_abs,wrapping_neg, andoverflowing_negwhich pass for all inputs.Resolves #71
By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.