Magical function to support reflection

[Matthew Pickering]

I modified the example on the wiki to compile but I seem to have
missed something, could you perhaps point out what I missed?

https://gist.github.com/mpickering/da6d7852af2f6c8f59f80ce726baa864

```
*Main> test1 2 123 441212
441335
```

On Thu, Jan 19, 2017 at 3:58 AM, David Feuer <david at well-typed.com> wrote:
> I've updated https://ghc.haskell.org/trac/ghc/wiki/MagicalReflectionSupport to
> reflect both Simon's thoughts on the matter and my own reactions to them. I
> hope you'll give it a peek.
>
> David Feuer
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