[Haskell-beginners] cabal install snap-server-0.9.5.1: At least the following dependencies are missing: attoparsec >=0.10 && <0.13 && ==0.13.0.1

[Stanislaw Findeisen]

Hi

Could anyone explain this to me, please?

$ cabal install snap-server-0.9.5.1
Resolving dependencies...
Configuring snap-server-0.9.5.1...
cabal: At least the following dependencies are missing:
attoparsec >=0.10 && <0.13 && ==0.13.0.1
cabal: Error: some packages failed to install:
snap-server-0.9.5.1 failed during the configure step. The exception was:
ExitFailure 1

Where does this unsatisfiable dependency come from? snap-server-0.9.5.1
seems to require just attoparsec (>=0.10 && <0.14):
http://hackage.haskell.org/package/snap-server-0.9.5.1 . And attoparsec
0.13.0.1 is already installed:

$ cabal list --installed attoparsec
* attoparsec
    Synopsis: Fast combinator parsing for bytestrings and text
    Default available version: 0.13.0.1
    Installed versions: 0.13.0.1
    Homepage: https://github.com/bos/attoparsec
    License:  BSD3

* attoparsec-enumerator
    Synopsis: Pass input from an enumerator to an Attoparsec parser.
    Default available version: 0.3.4
    Installed versions: 0.3.4
    Homepage: https://john-millikin.com/software/attoparsec-enumerator/
    License:  MIT

I am trying to install hakyll 4.6.*, and snap-server seems to be one of
the requirements. Hakyll 4.6.* is an old version but AFAIR I need that
due to conflicting versions of containers.

Thanks!

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