[Haskell-cafe] yi-editor: Duplicate instance declarations

[Nicolas Pouillard]

Excerpts from Marcelo Sousa's message of Sun Sep 27 14:13:43 +0200 2009:
> Hey guys,
> 
> I'm trying to install yi using cabal but I got this error. Any ideas
> how to solve it?!
> I'm using ghc-6.10.1 and cabal-install version 0.6.2 using version
> 1.6.0.2 of the Cabal library.

This means that you either have to downgrade data-accessor, or trash out the
Category instance in Yi/Prelude.hs line 182.

> $ cabal install yi
> Resolving dependencies...
> Configuring yi-0.6.1...
> Preprocessing library yi-0.6.1...
> Preprocessing executables for yi-0.6.1...
> Building yi-0.6.1...
> [  1 of 120] Compiling System.FriendlyPath ( System/FriendlyPath.hs,
> dist/build/System/FriendlyPath.o )
> [  2 of 120] Compiling Shim.ProjectContent ( Shim/ProjectContent.hs,
> dist/build/Shim/ProjectContent.o )
> [  3 of 120] Compiling Parser.Incremental ( Parser/Incremental.hs,
> dist/build/Parser/Incremental.o )
> [  4 of 120] Compiling Data.Trie        ( Data/Trie.hs, dist/build/Data/Trie.o )
> [  5 of 120] Compiling Data.DelayList   ( Data/DelayList.hs,
> dist/build/Data/DelayList.o )
> [  6 of 120] Compiling Data.Rope        ( Data/Rope.hs, dist/build/Data/Rope.o )
> [  7 of 120] Compiling Data.Prototype   ( Data/Prototype.hs,
> dist/build/Data/Prototype.o )
> [  8 of 120] Compiling HConf.Utils      ( HConf/Utils.hs,
> dist/build/HConf/Utils.o )
> [  9 of 120] Compiling HConf.Paths      ( HConf/Paths.hs,
> dist/build/HConf/Paths.o )
> [ 10 of 120] Compiling Paths_yi         (
> dist/build/autogen/Paths_yi.hs, dist/build/Paths_yi.o )
> [ 11 of 120] Compiling HConf            ( HConf.hs, dist/build/HConf.o )
> [ 12 of 120] Compiling Yi.Char.Unicode  ( Yi/Char/Unicode.hs,
> dist/build/Yi/Char/Unicode.o )
> [ 13 of 120] Compiling Yi.UI.Common[boot] ( Yi/UI/Common.hs-boot,
> dist/build/Yi/UI/Common.o-boot )
> [ 14 of 120] Compiling Yi.String        ( Yi/String.hs, dist/build/Yi/String.o )
> [ 15 of 120] Compiling Yi.Monad         ( Yi/Monad.hs, dist/build/Yi/Monad.o )
> [ 16 of 120] Compiling Yi.Keymap.Completion ( Yi/Keymap/Completion.hs,
> dist/build/Yi/Keymap/Completion.o )
> [ 17 of 120] Compiling Yi.Editor[boot]  ( Yi/Editor.hs-boot,
> dist/build/Yi/Editor.o-boot )
> [ 18 of 120] Compiling Yi.Debug         ( Yi/Debug.hs, dist/build/Yi/Debug.o )
> [ 19 of 120] Compiling Yi.Prelude       ( Yi/Prelude.hs,
> dist/build/Yi/Prelude.o )
> 
> Yi/Prelude.hs:182:9:
>     Duplicate instance declarations:
>       instance Category Accessor.T -- Defined at Yi/Prelude.hs:182:9-38
>       instance Category Accessor.T
>         -- Defined in data-accessor-0.2.1:Data.Accessor.Private
> cabal: Error: some packages failed to install:
> yi-0.6.1 failed during the building phase. The exception was:
> exit: ExitFailure 1

-- 
Nicolas Pouillard
http://nicolaspouillard.fr