[Haskell-cafe] Testing invasive proposals with Hackager

Maksymilian Owsianny maksymilian.owsianny at gmail.com
Fri Jun 14 00:13:07 CEST 2013

Hmm... I'll have to look into it, but it looks promising. Now if we
could make hackage run such fixes automatically whilst sending pull
requests to authors... then maybe we could even fix The Great Num
Fiasco of 98.

On Thu, Jun 13, 2013 at 8:45 PM, AlanKim Zimmerman <alan.zimm at gmail.com>wrote:

> Roman Cheplyaka has written a tool called HasFix for updating source based
> on new versions of libraries.
> The presentation on it is here http://ro-che.info/docs/ and the code is
> at https://github.com/feuerbach/hasfix
> Perhaps it could be pressed into use for automatic update of historical
> code?
> Alan
> On Thu, Jun 13, 2013 at 6:30 PM, Maksymilian Owsianny <
> maksymilian.owsianny at gmail.com> wrote:
>> I was thinking about something similar some time ago, but not just
>> testing but also fixing things automatically. Taking for example
>> Semigroup => Monoid this would break in places where you have instance
>> for Monoid but don't have instance for Semigroup. But if you have
>> instance for Monoid making instance for Semigroup is straightforward:
>> instance Semigroup <TypeYouAreFixing> where
>>     (<>) = <copy code from mappend for that type>
>> I'm still kind of new to Haskell, so I'm not sure how hard such,
>> TemplateHaskell-like automagic migration tool, would be to make, but
>> I feel like such a tool would be of incredible importance for the
>> community. Because otherwise, without such thing, there are usually
>> two ways a language can evolve:
>>     1. Caring for backwards compatibility, and accumulating mistakes
>>        like that over time, and becoming more and more like crap.
>>     2. Making fixes that break everyones code, and because of that
>>        being ignored by the industry.
>> I like Haskell because it usually takes the second route, but as
>> community grows it will be less and less the case. With such a tool
>> you could have best of both worlds.
>> Though I assume that somebody already thought of that and come to the
>> conclusion that in general case you cannot make such tool because
>> Gödel is a bastard that breaks everyones toys, or something along this
>> lines.
>> On Thu, Jun 13, 2013 at 12:54 PM, Niklas Hambüchen <mail at nh2.me> wrote:
>>> On 13/06/13 18:36, Vo Minh Thu wrote:
>>> > "For example, here is a run with GHC, no special options and using 4
>>> > threads (note that this generally takes a long time, i.e. a few days):"
>>> My builds finished in < 10 hours on an i7.
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