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Disclaimer: This was done as I was bored waiting at the airport, so it might not be perfect/complete yet.
Since proc_macro was stabilized recently, I thought it would be a nice idea to make this work on stable.
Well, surprise, proc_macro_diagnostics is still an unstable feature. But hey, it works on the current nightly, so that's something, I guess?
Apart from the obvious, I also applied rustfmt and fixed the one thing Clippy complained about.