classP recently deleted from TH.Lib

[Simon Peyton Jones]

I suspect it was accidental, but Richard will doubtless say in due course

Simon

From: ghc-devs [mailto:ghc-devs-bounces at haskell.org] On Behalf Of Johan Tibell
Sent: 12 May 2014 15:35
To: Gabor Greif
Cc: ghc-devs
Subject: Re: classP recently deleted from TH.Lib

That would be nice. I had to fix some breakage caused by this in one of Bryan's libraries.

On Mon, May 12, 2014 at 4:12 PM, Gabor Greif <ggreif at gmail.com<mailto:ggreif at gmail.com>> wrote:
The last two commits from (Apr 9) on

<https://github.com/ghc/packages-template-haskell/commits/master/Language/Haskell/TH/Lib.hs>

removed a helper to construct applied type class constraints (`classP`).

Some packages (notably `llvm-general-pure`) though, depend on it.

Can we add back something like this:

{{{
classP :: Name -> [Q Type] -> Q Pred
classP cla tys
  = do
      tysl <- sequence tys
      return (foldl' AppT (ConT cla) tysl)
}}}

and export it again? Or is there such a helper with a different name already?

Cheers,

    Gabor
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