Собственно, сабж. Разработчики git'а хотят разбавить его код кодом на Rust'е: https://www.phoronix.com/news/GCC-Rust-Developer-Discussion .
Using Rust within Git is being considered to lower the risk of memory safety bugs, making it easier when refactoring or adding new code to Rust, and opening up Git development to Rust developers that may not be experienced or comfortable in C.