[Haskell-cafe] Thoughts about redesigning "Num" type class

[Brandon Allbery]

On Mon, Sep 7, 2015 at 10:08 AM, DreamApart AtHaskells <rnmss.hs at gmail.com>
wrote:

> We cannot define a (+) alone for a type, so we got many different
> functions
> from different libs, like mappend, mplus, plus, (<+>), (.+.), (+.), which
> all reads
> "plus".
>

I should mention one other difficulty: MonadPlus and Monoid are not quite
the same thing. mplus and mappend can't really be unified into a single
conceptual structure (mostly because of the Maybe instance).

-- 
brandon s allbery kf8nh                               sine nomine associates
allbery.b at gmail.com                                  ballbery at sinenomine.net
unix, openafs, kerberos, infrastructure, xmonad        http://sinenomine.net
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