Cabal cannot resolve dependencies for my Yesod website

[Michael Snoyman]

I answered on Stack Overflow, but copying here:

This looks like a typical cabal dependency solver shortcoming. Can you try
running again with `--max-backjumps=-1 --reorder-goals`?

On Wed, Jun 24, 2015 at 7:07 AM Philip White <philip at mailworks.org> wrote:

> Hello, all,
>
> I am trying to make the next big thing with Yesod -- but for now, just a
> Hello World website. After getting it running locally, I tried to integrate
> it with Circle CI, which has support for cabal-based Haskell projects.
>
> Circle CI runs the following commands:
> cabal sandbox init
> cabal install --upgrade-dependencies --constraint="template-haskell
> installed" --dependencies-only --enable-tests
>
> With this invocation, cabal cannot resolve dependencies no matter how I
> change the cabal config. If, however, I run just `cabal install`,
> everything works.
>
> This cabal failure occurs both on a CircleCI host and my laptop exactly
> the same way, so I know it's not my environment.
>
> I wrote a StackOverflow question with more details:
> http://stackoverflow.com/questions/31010999/cabal-cannot-resolve-dependencies-chooses-wrong-version-of-containers
>
> The github repo, for ease of reproducing the problem:
> https://github.com/philipmw/yesod-website
>
> I hope that someone on the list is able to help. Thanks.
>
> --
> Philip
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