Error while installing new packages with GHC 7.4.1

[Antoras]

Ok, interesting info. But how to solve the problem now? Should I contact 
the author of Hoogle and ask him about how solving this?


On 03/01/2012 02:02 AM, Albert Y. C. Lai wrote:
> On 12-02-29 06:04 AM, Antoras wrote:
>> I don't know where the dependency to array-0.3.0.3 comes from. Is it
>> possible to get more info from cabal than -v?
>
> hoogle-4.2.8 has "Cabal >= 1.8 && < 1.13", this brings in Cabal-1.12.0.
>
> Cabal-1.12.0 has "array >= 0.1 && < 0.4", this brings in array-0.3.0.3.
>
> It is a mess to have 2nd instances of libraries that already come with 
> GHC, unless you are an expert in knowing and avoiding the treacherous 
> consequences. See my
> http://www.vex.net/~trebla/haskell/sicp.xhtml
>
> It is possible to fish the output of "cabal install --dry-run -v3 
> hoogle" for why array-0.3.0.3 is brought in. It really is fishing, 
> since the output is copious and of low information density. Chinese 
> idiom: needle in ocean (haystack is too easy). Example:
>
> "selecting hoogle-4.2.8 (hackage) and discarding Cabal-1.1.6, 1.2.1, 
> 1.2.2.0,
> 1.2.3.0, 1.2.4.0, 1.4.0.0, 1.4.0.1, 1.4.0.2, 1.6.0.1, 1.6.0.2, 1.6.0.3,
> 1.14.0, blaze-builder-0.1, case-insensitive-0.1,"
>
> We see that selecting hoogle-4.2.8 causes ruling out Cabal 1.14.0
>
> Similarly, the line for "selecting Cabal-1.12.0" mentions ruling out 
> array-0.4.0.0
>
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