GoKawiilRust bug tracker lists soundness flaws in borrow checker dating back 11 years
A set of open issues on Rust's GitHub repository documents unsoundness bugs in the compiler's borrow checker, some tied to destructors, lifetimes, and variance handling, with reports dating back as far as 11 years. The issues are tagged as high-priority soundness holes and flagged for review by Rust's types team.
GoKawiil's interpretation of the reporting above, not reported fact.
Soundness bugs in a borrow checker are serious because the entire premise of Rust's safety guarantees rests on the compiler correctly rejecting memory-unsafe code; a flaw here could let unsafe patterns compile without warning. The age of these reports suggests some edge cases in lifetime and variance analysis are difficult to fix without broader changes to the type system, which may explain why they have persisted for over a decade.
- Multiple long-standing soundness bugs exist in Rust's borrow checker, some over a decade old.
- Issues span destructors, lifetimes, and variance handling within the compiler's type system.
- They are tagged high-priority and await review from Rust's types team.
Source: github.com, 2026-10-13
Published there as: “11 year old unsoundness bugs found in Rust borrow checker”
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