Error while installing new packages with GHC 7.4.1

[Neil Mitchell]

Hi Antoras,

I've just released Hoogle 4.2.9, which allows Cabal 1.15, so hopefully
will install correctly for you.

Thanks, Neil

On Thu, Mar 1, 2012 at 5:02 PM, Neil Mitchell <ndmitchell at gmail.com> wrote:
> Hi Antoras,
>
> The darcs version of Hoogle has had a more permissive dependency for a few
> weeks. Had I realised the dependency caused problems I'd have released a new
> version immediately! As it stands, I'll release a new version in about 4
> hours. If you can't wait that long, try darcs get
> http://code.haskell.org/hoogle
>
> Thanks, Neil
>
>
> On Thursday, March 1, 2012, Antoras wrote:
>>
>> 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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>>
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