cabal sdist trouble with GHC from head

[Sven Panne]

2014-10-29 23:55 GMT+01:00 Herbert Valerio Riedel <hvriedel at gmail.com>:
> Fyi, there's a `cabal-install-head` package now[1] (may take a few
> minutes till its properly published in the PPA though); please test it
> and lemme know if it works as expected...
>
>  [1]: https://launchpad.net/~hvr/+archive/ubuntu/ghc/+sourcepub/4539223/+listing-archive-extra

Thanks for uploading this. Nevertheless, GHC from head and cabal from
head still don't like each other:

  https://travis-ci.org/haskell-opengl/StateVar/jobs/39470537#L103

I get "cabal: Prelude.chr: bad argument: 3031027"... o_O