[Haskell-cafe] Some help needed to start Haskell with Yi

Henning Thielemann lemming at henning-thielemann.de
Wed Nov 18 19:07:37 EST 2009

Kapil Hari Paranjape schrieb:
> Hello,
> On Sat, 14 Nov 2009, Jaco van Iterson wrote:
>> Only installation with 'cabal install yi' in a Cygwin shell under MS Windows
>> XP ended in:
>> 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.exe: Error: some packages failed to install:
>> yi-0.6.1 failed during the building phase. The exception was:
>> exit: ExitFailure 1
>> Seems easy to fix but I can't even find where on my drive I can find the
>> source code.
>> Where is the source?

Seems to be that the author defined an orphan instance - something one
should never do!

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