Can't install Lattices for Haskell

1
votes

I'm trying to follow the instructions for installing the Haskell components required by Quipper; but, working from a fresh installation of Haskell using the binary installer.

I get as far on the list as attempting to install the Lattices package:

cabal update
cabal install random
cabal install mtl
cabal install primes
cabal install Lattices

However I encounter the follwoing error:

Lattices-0.0.1 failed during the building phase. The exception was: ExitFailure 1

If I attempt to continue the Quipper install instructions:

cabal install zlib
cabal install easyrender

I encounter further errors:

cabal: Could not resolve dependencies:

I'm not sure how to proceed. What can I do to complete the package installation instructions for Quipper?

Resolving dependencies...
Configuring Lattices-0.0.1...
Building Lattices-0.0.1...
Failed to install Lattices-0.0.1
Build log ( /Users/Roy/.cabal/logs/Lattices-0.0.1.log ):
Configuring Lattices-0.0.1...
Building Lattices-0.0.1...
Preprocessing library Lattices-0.0.1...
[1 of 2] Compiling Math.LinearAlgebra.GramSchmidt ( src/Math/LinearAlgebra/GramSchmidt.hs, dist/build/Math/LinearAlgebra/GramSchmidt.o )

src/Math/LinearAlgebra/GramSchmidt.hs:25:26:
    Ambiguous occurrence ‘*>’
    It could refer to either ‘Prelude.*>’,
                             imported from ‘Prelude’ at src/Math/LinearAlgebra/GramSchmidt.hs:2:8-37
                             (and originally defined in ‘GHC.Base’)
                          or ‘Math.Algebra.LinearAlgebra.*>’,
                             imported from ‘Math.Algebra.LinearAlgebra’ at src/Math/LinearAlgebra/GramSchmidt.hs:7:1-43
cabal: Error: some packages failed to install:
Lattices-0.0.1 failed during the building phase. The exception was:
ExitFailure 1

Resolving dependencies...
cabal: Could not resolve dependencies:
trying: easyrender-0.1.0.1 (user goal)
next goal: base (dependency of easyrender-0.1.0.1)
rejecting: base-4.8.1.0/installed-075... (conflict: easyrender => base>=4.6 &&
<4.8)
rejecting: base-4.8.1.0, 4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0,
4.5.1.0, 4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1,
4.2.0.0, 4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires
installed instance)
Dependency tree exhaustively searched.

OS X 10.10.4; Xcode 6.4; CLT: 6.4.0.0.1.1435007323; Clang: 6.1 build 602; Haskell GHC: 7.10.2. Using Homebrew in general, but, following what appears to be Homebrew's recommendation, not for Haskell.

2
haskellinstallationpackagingcabalhaskell-platform
Note: I'm new to Haskell so I am working from a fresh installation and no experience with Cabal other than executing the instructions specified for configuring Quipper. - orome
Looks like the source of Lattices-0.0.1 is not compatible with newer versions of base which now include the Applicative Functor operators (<$>), (<*>), (*>) & (<*) by default - recursion.ninja
@recursion.ninja: Can you elaborate? What can I do to get around that. - orome
@recursion.ninja: Also, did I start the "right" way by installing using the platform. I generally use Homebrew, but when I brew info haskell-platform I get a message pointing me to the platform (which certainly seems to be well maintained and easy to set up). - orome

2 Answers

3
votes

I wasn't actually aware anyone was using Lattice-0.0.1 from Hackage at all, so when someone reported me this bug last month, I did fix it on GitHub, but did not immediately release a new version because that didn't seem urgent. Seems I was mistaken :-)

I've uploaded a new version to Hackage, Lattices-0.0.2, that should fix this issue.

1
votes

The source of Lattices-0.0.1 is not compatible with the newer versions of base included in GHC 7.10.1 or greater which now includes the Applicative Functor operators (<$>), (<*>), (*>) & (<*) by default.

In previous versions of base, the Applicative Functor operators would need to be explicitly imported:

import Control.Applicative ((<$>), (<*>), (*>), (<*))

main = show <$> getArgs -- use the applicative operator(s)

In the latest version of base included with GHC 7.10.1 or greater these operators are included implicitly in the Prelude module.

-- This is not necessary
-- import Control.Applicative ((<$>), (<*>), (*>), (<*))

main = show <$> getArgs -- use the applicative operator(s)

Since the Lattices-0.0.1 package was created a long time ago, it's source is not compatible with the newest version of GHC & base which you installed via the haskell-platform. If you look at the source you can see that the *> operator is used from a mathematics package import. But given the implicit prelude import of *> from the Applicative Functor module there is now a naming ambiguity that did not exist in earlier versions of base. This causes the compilation error.

To correctly compile the Lattice-0.0.1 package you will need to use a version of GHC which is older than GHC 7.10.1.

The haskell-platform is well maintained, unfortunately the Lattices-0.0.1 package is not...