During December 2025, Notgull focused on improving performance and stability in the rust-lang/rust repository by addressing time-related bugs in system programming contexts. They corrected the initialization of SystemTime constants in Rust’s time.rs, ensuring alignment with the language’s type system and preventing build regressions. Notgull also updated Vita libc integration, marking the Vita platform as unsupported for utimensat to resolve compilation failures. These targeted Rust code changes enhanced cross-platform portability and reduced CI failures, particularly for Hermit-ABI time functionality. Their work demonstrated depth in Rust and system programming, emphasizing robust build stability and correctness for time APIs across platforms.