TH changes for ghc 8.0

[Erik de Castro Lopo]

Erik Hesselink wrote:

> That function does exist for me in rc2:
> 
> cxt :: [PredQ] -> CxtQ

Ah, there is it is!

But I'm trying to write code that works with ghc-7.10 *and* ghc-8.0
(yes, I'm using CPP in all its ugly glory), but if I've got code that
works with ghc-7.10 (the first type signature below):

> - dataD :: CxtQ -> Name -> [TyVarBndr]               -> [ConQ] -> [Name] -> DecQ
> + dataD :: CxtQ -> Name -> [TyVarBndr] -> Maybe Kind -> [ConQ] -> CxtQ   -> DecQ

how do I convert it to the second? Adding a `Nothing` for the `Maybe
Kind` argument is easy, but if the old code has `[Name]`, how do I
convert it to a `CxtQ`. The `cxt` function won't do it.

Erik
-- 
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Erik de Castro Lopo
http://www.mega-nerd.com/