I'm just trying these examples, and I can't figure out how to import quickcheck2 rather than quickcheck1. I've looked around but I can't seem to find any information on this. How do I do it? Thanks! On Mon, Aug 30, 2010 at 11:56 PM, John Millikin wrote:

Define a custom element generator, which has characters with your desired values:

myRange :: Gen Char myRange = elements (['A'..'Z'] ++ ['a' .. 'z'] ++ " ~!@#$%^&*()")

You can use "forAll" to run tests with a specific generator:

forAll myRange $ \c -> chr (ord c) == c

On Mon, Aug 30, 2010 at 08:12, Sebastian Höhn wrote:

...

Hello,

perhaps I am just blind or is it a difficult issue: I would like to generate Char values in a given Range for QuickCheck2. There is this simple example from the haskell book:

instance Arbitrary Char where   arbitrary = elements (['A'..'Z'] ++ ['a' .. 'z'] ++ " ~!@#$%^&*()")

This does not work in QuickCheck2 since the instance is already defined. How do I achieve this behaviour in QC2?

Thanks for helping.

Sebastian _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

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Thanks! This makes perfect sense, but as I just discovered using ghci -v there is an even stranger problem. I'm side-tracking slightly from the original question here, but nevertheless... GHC gives the following output: --- GHCi, version 6.12.3: http://www.haskell.org/ghc/ :? for help <command line>: cannot satisfy -package QuickCheck-2.1.1.1: QuickCheck-2.1.1.1-c7435cb0d5b5de72fe9540c48335606d is unusable due to missing or recursive dependencies: ghc-6.12.3-66a382195c8a71849653439b67021fd1 (use -v for more information) shell returned 1 --- However I am using the version of GHC mentioned, so I have no idea what is going on. On Tue, Aug 31, 2010 at 1:09 AM, John Millikin wrote:

Update your cabal package list, and then install QuickCheck. Optionally, you can use a version specifier:

   cabal update    cabal install 'QuickCheck >= 2'

This should make QuickCheck 2 the default in GHCI. If it doesn't, you may need to specify the version:

   ghci -package QuickCheck-2.2

For Cabal-packaged libraries/applications, simply update your version requirements.

On Mon, Aug 30, 2010 at 09:06, Lyndon Maydwell wrote:

...

I'm just trying these examples, and I can't figure out how to import quickcheck2 rather than quickcheck1. I've looked around but I can't seem to find any information on this. How do I do it?

Thanks!

ghc-pkg check doesn't list any broken dependencies. On Tue, Aug 31, 2010 at 9:27 AM, Ivan Lazar Miljenovic wrote:

On 31 August 2010 03:18, Lyndon Maydwell wrote:

...

Thanks!

This makes perfect sense, but as I just discovered using ghci -v there is an even stranger problem. I'm side-tracking slightly from the original question here, but nevertheless...

GHC gives the following output:

--- GHCi, version 6.12.3: http://www.haskell.org/ghc/  :? for help <command line>: cannot satisfy -package QuickCheck-2.1.1.1:    QuickCheck-2.1.1.1-c7435cb0d5b5de72fe9540c48335606d is unusable due to missing or recursive dependencies:      ghc-6.12.3-66a382195c8a71849653439b67021fd1    (use -v for more information)

shell returned 1

What does "ghc-pkg check" say?

To me, it sounds like you upgraded a boot library, which is a big no-no.

(The ghc mentioned here is the ghc library, not the compiler itself.)

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com

Yep. Definitely the same user. On Tue, Aug 31, 2010 at 7:35 PM, Ivan Lazar Miljenovic wrote:

On 31 August 2010 20:38, Lyndon Maydwell wrote:

...

ghc-pkg check doesn't list any broken dependencies.

You sure this is with the same user?  ghci is unlikely to complain about broken libraries if ghc-pkg check doesn't...

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com

Yep :) Is there a batch of information that might be useful? I can send any relevant files, aliases, versions, etc at once to help if you like. On Wed, Sep 1, 2010 at 12:35 AM, Sebastian Höhn wrote:

Do you have ~/.cabal/bin/ in your PATH?

- Sebastian

Am 31.08.2010 um 15:57 schrieb Lyndon Maydwell:

...

Yep. Definitely the same user.

On Tue, Aug 31, 2010 at 7:35 PM, Ivan Lazar Miljenovic wrote:

...

On 31 August 2010 20:38, Lyndon Maydwell wrote:

...

ghc-pkg check doesn't list any broken dependencies.

You sure this is with the same user?  ghci is unlikely to complain about broken libraries if ghc-pkg check doesn't...

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com

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$HOME/.cabal/bin On Wed, Sep 1, 2010 at 10:55 AM, Ivan Lazar Miljenovic wrote:

Do you have ~/.cabal/bin or $HOME/.cabal/bin ?  The latter is preferable as some issues arise with the former...

On 1 September 2010 03:29, Lyndon Maydwell wrote:

...

Yep :)

Is there a batch of information that might be useful? I can send any relevant files, aliases, versions, etc at once to help if you like.

On Wed, Sep 1, 2010 at 12:35 AM, Sebastian Höhn wrote:

...

Do you have ~/.cabal/bin/ in your PATH?

- Sebastian

Am 31.08.2010 um 15:57 schrieb Lyndon Maydwell:

...

Yep. Definitely the same user.

On Tue, Aug 31, 2010 at 7:35 PM, Ivan Lazar Miljenovic wrote:

...

On 31 August 2010 20:38, Lyndon Maydwell wrote:

...

ghc-pkg check doesn't list any broken dependencies.

You sure this is with the same user?  ghci is unlikely to complain about broken libraries if ghc-pkg check doesn't...

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com IvanMiljenovic.wordpress.com