Similarly, I think it would help us to release a tool in the tools/ repo that analyzes a would-be Phobos pull request and ensures it's styled the same way as most of Phobos
I'm not sure if git supports this but I think it should be done fully automatically. Not even something the user runs, just when they open the pull request, it reformats the code.
I'm pretty sure dfmt is up to the task in 99% of cases already.