Multi-stage TH

Main.hs

-- Notice how flipping the order of anything makes this not
-- compile - this demonstrates that GHC is doing the following
-- in order:
-- 
--  1. Processing the `foo` declaration
--  2. Processing the `bar` declaration
--  3. Processing the `baz` declaration
--
-- So GHC is already doing multiple passes, right?

```haskell
{-# LANGUAGE TemplateHaskell, QuasiQuotes #-}

$([d| foo = (+1) |])

bar = foo

$([d| baz = bar . (+2) |])
```