This is my 25th weekly report.

# Diary

In rust-clippy, the new lint I proposed and implemented finally got merged into master. Here is the PR:

https://github.com/rust-lang/rust-clippy/pull/6859

This lint seemed relatively easy to implement, but actually it was moderately challenging, which allowed me to learn a lot about how to implement a basic lint in clippy. Specifically, we should use snippet_with_macro_callsite when we want to retrieve the original code snippet that could be a macro from Rust's intermediate representation - otherwise, we would end up getting a snippet with the macro expanded, which would not be suitable for the usage of showing a diagnostic message to users.

Overall, developing clippy's new rule has been a fantastic experience to me. I hope I'll contribute to it more and more.