Thinking about what's missing in our library coverage

[Malcolm Wallace]

> But the CPP that GHC supports is different (albeit less good) than  
> cpphs. So if you want to support the extension as it is currently  
> defined/used, you should just shell out to cpp like GHC does.

Shelling out to CPP is not much help if the executable that uses  
haskell-src-exts is running on a machine that does not have a C pre- 
processor installed (or if it is not configured to be found easily).

Regards,
     Malcolm