[Haskell-cafe] Build regressions due to GHC 7.6

[Alexander Kjeldaas]

On 30 August 2012 15:34, 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.
>
>
This was just an example, the CInt regexp handles multiple names, so
regexps have no problems handling this.

And it's a simple "git grep 'import.*Prelude.*catch'" to see if this
actually is a problem or not.

My point is that this works, fixes 99% of the cases, and is 1000x less work
overall.

Alexander



> 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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