[Haskell-beginners] two System.IO.Strict modules

[Hong Yang]

Thanks.


On Fri, Apr 26, 2013 at 8:33 AM, Brandon Allbery <allbery.b at gmail.com>wrote:

> On Thu, Apr 25, 2013 at 11:12 PM, Hong Yang <hyangfji at gmail.com> wrote:
>
>> There are two modules called the same name: System.IO.Strict, documented
>> respectively at
>>
>> http://hackage.haskell.org/packages/archive/strict-io/0.2.1/doc/html/System-IO-Strict.html
>>     http://hackage.haskell.org/package/strict-0.3.2
>>
>> My questions are:
>>
>> 1)    Will these two modules coexist in the same version of GHC? Or put
>> it another way, both modules' .tar.gz files have System/IO/Strict.hs
>> inside, will they overlap in physical disk? From where can I tell which
>> locations they will be installed to?
>>
>
> Each module gets its own directory tree under /usr/lib/ghc or ~/.ghc.
>
>
>> 2)    If yes, which module will "import System.IO.Strict" actually use?
>>
>
> This is a bit harder; it will try to pick one, but I don't know the rules.
> Ultimately it's best to use -package parameters to tell it which package to
> take it from.
>
> This is where building with cabal-install helps, as you specify the
> package to use in the manifest and only the packages listed in the manifest
> will be visible to ghc.
>
> --
> brandon s allbery kf8nh                               sine nomine
> associates
> allbery.b at gmail.com
> ballbery at sinenomine.net
> unix, openafs, kerberos, infrastructure, xmonad
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>
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