newbie: how to expose a package?

[Larry Evans]

On 10/27/10 13:39, Larry Evans wrote:
> With the following .hs:
> 
> ==<--TestPrettyPrintLeijen.hs-->
> module TestPrettyPrintLeijen where
[snip]
> import Debug.QuickCheck.Batch
> {- Above import based on exposed-modules: section of:
> /usr/lib/ghc-6.12.1/package.conf.d/QuickCheck-1.2.0.0.conf
> 
>    However:
> ghci TestPrettyPrintLeijen.hs
>    produces error:
> TestPrettyPrintLeijen.hs:9:7:
>     Could not find module `Debug.QuickCheck.Batch':
>       It is a member of the hidden package `QuickCheck-1.2.0.0'.
>       Use -v to see a list of the files searched for.
> -}
[snip]
> 
> How does one enable import of a module from some package?
> 
[snip]
Apparently using uickCheck-1.2.0.0.conf to pick module name is not
right.  However, using names from:

/usr/lib/ghc-6.12.1/package.conf.d/QuickCheck-2.1.0.2.conf

and in particular:

  Test.QuickCheck

works.  I should have read:

  http://www.haskell.org/ghc/docs/6.12.2/html/users_guide
    /packages.html#package-databases

more closely, and in particular:

  You can see GHC's package table by running GHC with the -v  flag.

which showed:

  hiding package QuickCheck-1.2.0.0 to avoid conflict with later
    version QuickCheck-2.1.0.2

Sorry for noise.

-regards,
Larry