You may have thought, if Rust can find a problem in a code and suggest a solution, why hasn't it applied the changes immediately? This is a reasonable idea, and it may be possible in the future, but now this feature in active development with the rustfix tool.

This project aims to provide a tool that can fix all compiler warnings, and today you can try to use it to move your project from Edition 2015 to Edition 2018. We don't need this tool in CI processes directly, but it can help to satisfy CI checks more quickly.