Finish chapters on macro expansion?

[alexreg]

Could we get someone to do this? I'm not sure who would be most appropriate. @jseyfried knows it better than most, but he's been absent lately.

[mark-i-m]

I believe @petrochenkov and @nrc are also really knowledgeable about the hygiene parts.

[alexreg]

Yep, you're right, @petrochenkov is for sure. Haven't interacted with @nrc about it, but I'll trust you on it!

[mark-i-m]

@federicomenaquintero had also mentioned in #15 that they might try to write something.

[mark-i-m]

I'm going to go ahead and close this as a duplicate of #15. But thanks for filing the issue @alexreg !