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

[Marcelo Sousa]

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.

Thanks,

Marcelo

-- Code --

$ 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