Worked on the rust-lang/rust repository to enhance memory safety in Rust’s iteration internals, focusing on zero-sized types. Addressed a critical bug in IntoIter::nth_back by ensuring correct alignment for ZSTs, which eliminated the risk of Undefined Behavior during iteration. Consolidated the core fix and introduced comprehensive regression tests, including Miri-based coverage in vec.rs, to validate correctness across multiple collection types. This effort improved the reliability and long-term safety of iteration utilities in Rust. The work leveraged expertise in memory management, system programming, and testing, resulting in safer iteration semantics for containers backed by zero-sized types in production environments.