During August 2025, Penguin_27 developed a new lint for the rust-lang/rust-clippy repository, targeting potential semantic errors in the use of from_raw_parts when identical expressions are supplied for both length and capacity. By leveraging Rust and static analysis techniques, Penguin_27 implemented this feature with comprehensive documentation and thorough test coverage, ensuring the lint reliably detects misuse patterns that could lead to subtle runtime bugs. The work focused on proactive quality improvements rather than reactive bug fixes, demonstrating depth in linting and test-driven development. This contribution helps Rust developers catch common mistakes early, improving code safety and overall project maintainability.