Update the book for procedural macros

[steveklabnik]

This issue tracks inclusion of information about procedural macros into the Book. This will happen in the 2018 edition.

Tracking issue: rust-lang/rust#38356

[steveklabnik]

This is now ready to go.

[steveklabnik]

In order to close this ticket, a link to the text should be sent to rust-lang/rust#54300 as well.

[abonander]

@steveklabnik are you working on this or is this up for grabs?

[steveklabnik]

I’m working on this! In general, I cannot accept entire chapters written by other people for legal reasons. I appreciate it though! I hope to open the PR Monday and will cc you for a review :)

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On Sep 29, 2018, at 1:49 PM, Austin Bonander ***@***.***> wrote: @steveklabnik are you working on this or is this up for grabs? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub, or mute the thread.

[mattraffel]

is there a link I can reference to learn about this?

[Gisleburt]

For @mattraffel and anyone else looking, the documentation is currently here: https://doc.rust-lang.org/book/ch19-06-macros.html