Great to see that you want to help out! Here are some tips for getting started:
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If you're just starting out, I suggest tackling some easy issues first.
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Please leave a comment on the issue you're working on, so that other people don't duplicate work.
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Most contributions should include tests – see the existing test code for how to write these.
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Documentation on the proc macro interface can be found on docs.rust-lang.org.
Have fun!