moving Foldable and Traversable to Prelude

[Carter Schonwald]

+1 on that functor monad bit

On Thursday, May 16, 2013, Edward Kmett wrote:

> I'd be +1 for doing that, too.
>
>
> On Wed, May 15, 2013 at 8:16 PM, John Lato <jwlato at gmail.com<javascript:_e({}, 'cvml', 'jwlato at gmail.com');>
> > wrote:
>
>> -1, for the reasons given by Henning.
>>
>> If we're going to be changing stuff in Prelude, why not start with
>> Functor/Monad?
>>
>>
>> On Thu, May 16, 2013 at 5:04 AM, Henning Thielemann <
>> lemming at henning-thielemann.de <javascript:_e({}, 'cvml',
>> 'lemming at henning-thielemann.de');>> wrote:
>>
>>>
>>> On Wed, 15 May 2013, David Luposchainsky wrote:
>>>
>>>  +1. I think the Prelude should be a general module of the most commonly
>>>> needed functions, which (generalized) folds and traversals are certainly
>>>> part of; right now it feels more like a beginner module at times.
>>>>
>>>
>>> It is certainly a kind of beginner module, but that's good. Experts know
>>> how to import. Putting the most general functions into Prelude does not
>>> work because:
>>>
>>> 1. There are often multiple sensible generalizations of a Prelude
>>> function.
>>>
>>> 2. You have to add more type annotations since types cannot be infered
>>> from the functions.
>>>
>>>
>>> There is simply no need to change Prelude and all packages that rely on
>>> specific types. Just don't be lazy and import the stuff you need!
>>>
>>> I should change my vote to:
>>>
>>>  -10
>>>
>>>
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>>
>>
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