[Haskell-cafe] Build regressions due to GHC 7.6

[Michael Sloan]

Whoops, I messed up that first example:

module PreludePre_7_6 (module Prelude, catch) where

import Prelude
import qualified System.IO.Error as E

catch = E.catch

On Thu, Aug 30, 2012 at 12:16 PM, Michael Sloan <mgsloan at gmail.com> wrote:
> A good way to specify such refactorings is as a Haskell module.  For example:
>
>
> module PreludePre_7_6 where
>
> import Prelude hiding ( catch )
>
>
> Or, an example of avoiding the Eq / Show / Num debacle:
>
> module PreludePre_7_4 (module Prelude, Num) where
>
> import Prelude hiding ( Num )
> import qualified Prelude as P
>
> instance template (Eq a, Show a) => Num a where
>   instance P.Num a
>
>
> (Uses my instance template proposal - though with different keywords -
> https://github.com/mgsloan/instance-templates )
>
>
> Let's say we wanted to rename "catch" to "unsafeCatch"
>
> module PreludePreUnsafeCatch (module Prelude, catch) where
>
> import Prelude hiding (unsafeCatch)
>
> catch = unsafeCatch
>
>
> Then, an automated refactoring system is "simply" a sourcecode-based
> module inliner.  Quite a bit of effort, certainly, but it's much
> better than coming up with a whole new notation for refactorings.
>
> -Michael
>
> On Thu, Aug 30, 2012 at 6:34 AM, Alexander Bernauer
> <alex-haskell at copton.net> wrote:
>> Hi
>>
>> I agree that automatic code migration can solve this issue in large
>> parts. The Python folks have done this to mitigate the transition from
>> version 2 to version 3 [1].
>>
>> On Thu, Aug 30, 2012 at 03:03:05PM +0200, Alexander Kjeldaas wrote:
>>> perl -ni -e 'print unless /import Prelude hiding \(catch\)/' $(git grep
>>> 'import Prelude hiding (catch)')
>>
>> I don't think regular expressions are powerful enough. This example
>> does not match on hiding multiple names, for instance.
>>
>> But writing proper 'HsModule -> HsModule' functions should be doable.
>>
>> And when each release comes with a bunch of such functions, packages
>> could be automatically migrated.
>>
>> Greetings
>>
>> Alex
>>
>> [1] http://docs.python.org/library/2to3.html
>>
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