7.10.1RC2 compile problem? ghc: internal error: PAP object entered!

[Reid Barton]

On Sat, Jan 31, 2015 at 11:09 AM, Herbert Valerio Riedel <hvriedel at gmail.com
> wrote:

> On 2015-01-31 at 14:34:35 +0100, George Colpitts wrote:
> > Maybe this is something I shouldn't be doing, but I thought it was worth
> > mentioning in case I have found a compiler bug.
> > Should I file a bug for this?
> >
> > cabal install *--allow-newer=base*  accelerate
> > ...
> > [10 of 10] Compiling Data.Label.Base  ( src/Data/Label/Base.hs,
> > dist/build/Data/Label/Base.o )
> > ghc: internal error: PAP object entered!
> >     (GHC version 7.10.0.20150123 for x86_64_apple_darwin)
> >     Please report this as a GHC bug:
> http://www.haskell.org/ghc/reportabug
>
> I suspect this has to do with `--allow-newer=base` allowing
> template-haskell-2.9.0.0 to be re-installed (which then becomes a
> build-dependency of `fclabels`). GHC 7.10, however, comes with
> template-haskell-2.10.0.0
>

Ah yes, you're exactly right. I didn't encounter this when I tried to
reproduce the issue because I have a bunch of lines like "constraint:
template-haskell installed" in my .cabal/config file.

Regards,
Reid Barton
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