[Haskell-cafe] GHC extensions

[Michel Haber]

Hello Cafe,

So I've been learning a bit about the GHC extensions from
https://github.com/i-am-tom/haskell-exercises. But the lessons say nothing
about how the extensions work behind the scenes.

For example, I've assumed that RankNTypes would require something similar
to dynamic dispatch in imperative languages in order to work. But this is
just an assumption.

So I was wondering where I can get a quick succinct read (or a summary at
least) about how these extensions are implemented, as well as their
performance cost (or gain!).

Also if someone knows other tutorials and lessons for these, and other
extensions, please feel free to share them :p

Thank you,
Michel :)
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