[Haskell-cafe] Weird error during derive-2.3.0.2 build

[Neil Mitchell]

Hi Alex,

The latest version of derive is 2.4.1, which has a number of compile
fixes for newer compilers. Any package I maintain is tested on GHC
6.10.4, 6.12.3 and 7.0.1 - so this bug should not be present in 2.4.1.

Thanks, Neil

On Sun, Dec 12, 2010 at 10:07 PM, Alex <alex.shtf at gmail.com> wrote:
> Hi all.
>
> I am trying to install the "yi" editor using cabal-install, which in turns
> installs the package 'derive-2.3.0.2'. I get the following error during
> derive's compilation:
>
> [53 of 58] Compiling Data.Derive.Internal.Traversal (
> Data/Derive/Internal/Traversal.hs,
> dist/build/Data/Derive/Internal/Traversal.o )
>
> Data/Derive/Internal/Traversal.hs:34:0:
>     Illegal instance declaration for `Applicative (Writer w)'
>         (All instance types must be of the form (T t1 ... tn)
>          where T is not a synonym.
>          Use -XTypeSynonymInstances if you want to disable this.)
>     In the instance declaration for `Applicative (Writer w)'
> cabal: Error: some packages failed to install:
> derive-2.3.0.2 failed during the building phase. The exception was:
> ExitFailure 1
>
> Of course, I tried to build it with --ghc-option=-XTypeSynonymInstances,
> which in turn gives another compilation error.
>
> I am using ubuntu maverick 32-bit, with ghc-6.12.1 and cabal-install 0.8.2.
> The ghc was installed from the package repository. Cabal was installed
> using:
>
> cabal-install cabal
>
> Alex.
>
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