Drastic Prelude changes imminent

[Edward Kmett]

AMP started at the same time as the BBP, both were started by threads of
roughly the same size, with the same level of active participation. The
major difference is no warnings were added for the Foldable/Traversable
proposal as at the time, generalizing types was seen as pretty simple.

e.g. foldMap comes into scope without a warning in 7.10 due to BBP, but
then (<*>) also comes into scope in the AMP and we didn't warn for that,
either.

I do fully agree that the BBP could have gone in a bit cleaner if we'd
realized the full scope of the issues we would face during the 7.8
timeline. Most of the hiccups only came clear after Herbert had spent
months refactoring the internals of base to even make the change possible.

Just an aside, though, it does appear objectively that those warnings
actually did very little good in terms of getting folks to fix their code.
By far the vast majority of the 7.10 related breakage we've seen has come
from folks who still don't have Applicative instances for their Monad.

-Edward

On Wed, Jan 28, 2015 at 4:20 PM, Joachim Breitner <mail at joachim-breitner.de>
wrote:

> Hi,
>
> Am Mittwoch, den 28.01.2015, 15:45 -0500 schrieb Edward Kmett:
>
>
> > We absolutely do need to work out more effective ways to communicate
> > what is going on.
>
> I’d like to point out that the AMP proposal and process can serve as a
> positive example. It is a change of comparable impact, but has sired
> much less noise. My impression was that there were more people aware of
> it, and sooner in the process, and that has helped.
>
>
> Maybe every possibly far-reaching change should be advertised with a
> comic from now on? https://ro-che.info/ccc/21 :-)
>
> Greetings,
> Joachim
> >
>
> --
> Joachim “nomeata” Breitner
>   mail at joachim-breitner.de • http://www.joachim-breitner.de/
>   Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0xF0FBF51F
>   Debian Developer: nomeata at debian.org
>
>
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