TTG and annotations

[Simon Peyton Jones]

Hi Alan

I know that you are continuing to work hard on annotations in the TTG
extension fields -- thank you.

As you know, I'm very eager to get a big Note to explain how it all works.
At the moment I am completely lost, and I am reduced to cargo-culting code
by copy/pasting and hoping for the best.  Plus we are over-reliant on you,
which isn't really fair on you.

Several of us (including me and Rodrigo, and doubtless other ghc-devs,
cc'd) would be happy to review, edit, and improve -- but it is hard for us
to see the "big picture".

Could you see your way to drafting something? It need not be that long
initially, but having *something* to ask questions about and improve would
be super helpful.

I suggest drafting it in a Google doc so it was easy to edit, and for
others to contribute to, but ultimately it should be in the repo.

Thanks!

Simon
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