cabal install fails with empty conflict set

[Björn Peemöller]

Am 19.05.2014 13:27, schrieb Björn Peemöller:
> Hi,
> 
> I am trying to install a cabal package in a fresh, clean sandbox, but
> cabal fails with:
> 
>     cabal: Could not resolve dependencies:
>     Dependency tree exhaustively searched.

Update: It works when I manually install the package
transformers-compat-0.3.2 first.

- Does not work with transformers-0.2.2.1

- Works with transformers-0.3.0.0 (installed):

    $ cabal install transformers-compat-0.3.2 -f transformers3
    $ cabal install --only-dependencies

- Works with transformers-0.4.1.0:

    $ cabal install transformers-compat-0.3.2
    $ cabal install --only-dependencies