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can't install snaplet-hdbc, duplicate type signature
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Chris Kahn  
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 More options Sep 18 2012, 10:17 pm
From: Chris Kahn <christopher.k...@gmail.com>
Date: Tue, 18 Sep 2012 19:17:21 -0700 (PDT)
Local: Tues, Sep 18 2012 10:17 pm
Subject: can't install snaplet-hdbc, duplicate type signature
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Hey all,

I'm relatively new to Haskell, been learning for the last 6 months or so
and had a class in university that covered the basics. So I decided I'd
give the Snap framework a spin on my machine. It's a relatively new machine
so this is a fresh install of Haskell (GHC 7.4.1) on Ubuntu 12.04. I
installed Snap, created a skeleton project etc, and then went and did cabal
install snaplet-hdbc and it started compiling things and loading packages,
and finally spat out this error:

src/Snap/Snaplet/Internal/Types.hs:82:1:
    Duplicate type signature:
      src/Snap/Snaplet/Internal/Types.hs:82:1-47: snapletConfig ::
                                                    Lens (Snaplet a)
SnapletConfig
      src/Snap/Snaplet/Internal/Types.hs:76:1-39: snapletConfig ::
                                                    forall s_aySX.
                                                    Lens (Snaplet s_aySX)
SnapletConfig

src/Snap/Snaplet/Internal/Types.hs:87:1:
    Duplicate type signature:
      src/Snap/Snaplet/Internal/Types.hs:87:1-34: snapletValue ::
                                                    Lens (Snaplet a) a
      src/Snap/Snaplet/Internal/Types.hs:76:1-39: snapletValue ::
                                                    forall s_aySX. Lens
(Snaplet s_aySX) s_aySX
cabal: Error: some packages failed to install:
snap-0.9.1.1 failed during the building phase. The exception was:
ExitFailure 1

Is this because of something I've configured wrong, or is it a bug in Snap?
Can anybody help?

Cheers!
Chris


 
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MightyByte  
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 More options Sep 19 2012, 1:02 am
From: MightyByte <mightyb...@gmail.com>
Date: Wed, 19 Sep 2012 01:02:46 -0400
Local: Wed, Sep 19 2012 1:02 am
Subject: Re: [snap] can't install snaplet-hdbc, duplicate type signature
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This is caused by a problem in data-lens-template-2.1.6.  You need to
upgrade to the recently released 2.1.7.  The following commands should
correct the problem:

ghc-pkg unregister data-lens-template --force
ghc-pkg unregister snap --force
cabal update
cabal install snaplet-hdbc

On Tue, Sep 18, 2012 at 10:17 PM, Chris Kahn <christopher.k...@gmail.com>wrote:


 
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Chris Kahn  
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 More options Sep 19 2012, 10:38 pm
From: Chris Kahn <christopher.k...@gmail.com>
Date: Wed, 19 Sep 2012 19:38:40 -0700 (PDT)
Local: Wed, Sep 19 2012 10:38 pm
Subject: Re: [snap] can't install snaplet-hdbc, duplicate type signature
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Success! That did it. Thanks.


 
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