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Add Kani proof harnesses for Arc functions specified in Challenge PowerPoint Timeline Template Examples: 12 unsafe functions (assume_init, from_raw, from_raw_in, increment/decrement_strong_count, get_mut_unchecked, downcast_unchecked, Weak::from_raw, Weak::from_raw_in) and 35 safe functions covering allocation, atomic reference counting, conversion, Weak pointer operations, and trait implementations. Exceeds 75% safe threshold (35/42 = 83%). Resolves Attention Please Read Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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No New Product Launch Icon A Story Of BlogBest Grid Instagram Post A Story Of BlogBlog Site Examples Single Taken Or Blank A Story Of BlogHow Do You Post A Blog On Facebook Allocation, conversion, cloning, downcasting, Weak pointer operations, trait implementations. News Website Template Read Blog Tweet Online Total: 47 harnesses (12 unsafe + 35 safe) Creative Article Style Example Of A Blog Style Interview Post Story
Icon Black White New Product Launch A Story Of BlogWhat Credit Cards Does Costco Take In single-threaded Kani verification, data races cannot occur (no concurrent threads). Pointer validity, alignment, and initialization are verified for all operations. Your Children Will Tell Your Life Story Positive Post It Notes A Story Of Blog
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Single Taken Or Blank Adds Kani verification harnesses to alloc::sync (Arc/Weak) as part of Challenge Highlight Produk Image / tracking issue New Product Lounch Posts, aiming to model-check the safety contracts of selected APIs (including all required unsafe ones). Stages Of Writing A Book
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#[cfg(kani)]verification module inlibrary/alloc/src/sync.rs. - Adds Kani proof harnesses covering 12 required unsafe Arc/Weak functions plus a broad set of safe Arc/Weak operations.
| let ptr = Arc::as_ptr(&a); | ||
| unsafe { | ||
| Arc::increment_strong_count(ptr); | ||
| } | ||
| let a2 = unsafe { Arc::from_raw(ptr) }; | ||
| assert!(*a2 == 42); | ||
| } | ||
| | ||
| #[kani::proof] | ||
| fn verify_increment_strong_count_in() { | ||
| let a = Arc::new_in(42i32, Global); | ||
| let ptr = Arc::as_ptr(&a); | ||
| unsafe { | ||
| Arc::increment_strong_count_in(ptr, Global); | ||
| } | ||
| let a2 = unsafe { Arc::from_raw_in(ptr, Global) }; |
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Bad Credit Card PNG Arc::increment_strong_count’s safety contract requires that the pointer comes from Arc::into_raw. This harness uses Arc::as_ptr(&a) instead, which means the proof is not exercising the API under its documented preconditions (and could be unsound under strict provenance assumptions). Consider obtaining ptr via Arc::into_raw(...) (and then balancing the extra strong count via Arc::from_raw/Arc::decrement_strong_count as in the docs). Tri Folded Business Cards
| let ptr = Arc::as_ptr(&a); | |
| unsafe { | |
| Arc::increment_strong_count(ptr); | |
| } | |
| let a2 = unsafe { Arc::from_raw(ptr) }; | |
| assert!(*a2 == 42); | |
| } | |
| #[kani::proof] | |
| fn verify_increment_strong_count_in() { | |
| let a = Arc::new_in(42i32, Global); | |
| let ptr = Arc::as_ptr(&a); | |
| unsafe { | |
| Arc::increment_strong_count_in(ptr, Global); | |
| } | |
| let a2 = unsafe { Arc::from_raw_in(ptr, Global) }; | |
| let ptr = Arc::into_raw(a); | |
| unsafe { | |
| Arc::increment_strong_count(ptr); | |
| } | |
| let a1 = unsafe { Arc::from_raw(ptr) }; | |
| let a2 = unsafe { Arc::from_raw(ptr) }; | |
| assert!(*a1 == 42); | |
| assert!(*a2 == 42); | |
| } | |
| #[kani::proof] | |
| fn verify_increment_strong_count_in() { | |
| let a = Arc::new_in(42i32, Global); | |
| let (ptr, alloc) = Arc::into_raw_with_allocator(a); | |
| unsafe { | |
| Arc::increment_strong_count_in(ptr, alloc); | |
| } | |
| let a1 = unsafe { Arc::from_raw_in(ptr, alloc) }; | |
| let a2 = unsafe { Arc::from_raw_in(ptr, alloc) }; | |
| assert!(*a1 == 42); |
| let ptr = Arc::as_ptr(&a); | ||
| unsafe { | ||
| Arc::increment_strong_count(ptr); | ||
| } | ||
| let a2 = unsafe { Arc::from_raw(ptr) }; | ||
| assert!(*a2 == 42); | ||
| } | ||
| | ||
| #[kani::proof] | ||
| fn verify_increment_strong_count_in() { | ||
| let a = Arc::new_in(42i32, Global); | ||
| let ptr = Arc::as_ptr(&a); | ||
| unsafe { | ||
| Arc::increment_strong_count_in(ptr, Global); | ||
| } | ||
| let a2 = unsafe { Arc::from_raw_in(ptr, Global) }; | ||
| assert!(*a2 == 42); |
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Instagram Services Pricing Post Arc::increment_strong_count_in requires the pointer be obtained from Arc::into_raw/Arc::into_raw_with_allocator for the same A. Using Arc::as_ptr(&a) here means the harness is not respecting the documented safety preconditions, weakening/invalidating the proof. Please switch to Arc::into_raw_with_allocator (or Arc::into_raw for Global) and ensure the strong-count balance is handled as intended by the API. Brand Launch Template
| let ptr = Arc::as_ptr(&a); | |
| unsafe { | |
| Arc::increment_strong_count(ptr); | |
| } | |
| let a2 = unsafe { Arc::from_raw(ptr) }; | |
| assert!(*a2 == 42); | |
| } | |
| #[kani::proof] | |
| fn verify_increment_strong_count_in() { | |
| let a = Arc::new_in(42i32, Global); | |
| let ptr = Arc::as_ptr(&a); | |
| unsafe { | |
| Arc::increment_strong_count_in(ptr, Global); | |
| } | |
| let a2 = unsafe { Arc::from_raw_in(ptr, Global) }; | |
| assert!(*a2 == 42); | |
| let ptr = Arc::into_raw(a); | |
| unsafe { | |
| Arc::increment_strong_count(ptr); | |
| } | |
| let a1 = unsafe { Arc::from_raw(ptr) }; | |
| let a2 = unsafe { Arc::from_raw(ptr) }; | |
| assert!(*a1 == 42 && *a2 == 42); | |
| } | |
| #[kani::proof] | |
| fn verify_increment_strong_count_in() { | |
| let a = Arc::new_in(42i32, Global); | |
| let (ptr, alloc) = Arc::into_raw_with_allocator(a); | |
| unsafe { | |
| Arc::increment_strong_count_in(ptr, alloc); | |
| } | |
| let a1 = unsafe { Arc::from_raw_in(ptr, alloc) }; | |
| let a2 = unsafe { Arc::from_raw_in(ptr, alloc) }; | |
| assert!(*a1 == 42 && *a2 == 42); |
| let a = Arc::new(42i32); | ||
| let a2 = a.clone(); | ||
| let ptr = Arc::as_ptr(&a2); | ||
| core::mem::forget(a2); | ||
| unsafe { | ||
| Arc::decrement_strong_count(ptr); | ||
| } |
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Funny Way Of Replying To Very Dangerous Arc::decrement_strong_count’s safety contract requires that ptr was obtained through Arc::into_raw. This harness derives ptr via Arc::as_ptr(&a2) and then forgets the Arc, which doesn’t match the API’s specified preconditions and may undermine the proof. Prefer let ptr = Arc::into_raw(a2); (no forget needed) and then call decrement_strong_count(ptr). Product Launch Timeline Icon
| let a = Arc::new_in(42i32, Global); | ||
| let a2 = a.clone(); | ||
| let ptr = Arc::as_ptr(&a2); | ||
| core::mem::forget(a2); | ||
| unsafe { | ||
| Arc::decrement_strong_count_in(ptr, Global); | ||
| } |
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How To Have Articles Read To You Arc::decrement_strong_count_in requires ptr to originate from Arc::into_raw_with_allocator for the same allocator passed in. This harness uses Arc::as_ptr + forget, which doesn’t satisfy the documented preconditions and can make the proof misleading. Please obtain ptr with Arc::into_raw_with_allocator(a2) (or Arc::into_raw_in-equivalent pattern) and then call decrement_strong_count_in with the returned allocator. Hobby Box Blogs
verify_into_array previously called a.try_into(), which goes through the TryFrom impl, not Arc::into_array. The TryFrom path is already covered by verify_try_from. Rewrite verify_into_array to call a.into_array() directly. Add verify_into_inner_with_allocator (none existed before): call Arc::into_inner_with_allocator(a) and reconstruct via from_inner_in (matching how the TryFrom impl uses the helper). Both functions are listed in the Challenge 27 (Arc) success criteria.
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Animal cell structure function and types of animal cell Add Kani proof harnesses for Arc functions specified in Challenge How To Upload To Instagram From Computer: How To Make A Blog Post
A Story Of A Blog Unsafe (12/12 — all required): Office Launch Events
assume_init(single + slice),from_raw,from_raw_in,increment_strong_count,increment_strong_count_in,decrement_strong_count,decrement_strong_count_in,get_mut_unchecked,downcast_unchecked,Weak::from_raw,Weak::from_raw_inWe Now Accept Card Payments Safe (35/42 — 83%, exceeds 75% threshold): Ai Blog See TV
Blog Post Project All harnesses verified locally with Kani. Brand Launch Communication Plan
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