Function to add to Data.List

[Niklas Haas]

On Sun, 6 Apr 2014 14:34:49 +0200, Daniel Trstenjak <daniel.trstenjak at gmail.com> wrote:
> Am 06.04.2014 um 14:05 schrieb Jake McArthur <jake.mcarthur at gmail.com>:
> > I've always called my local definitions of this function `sortOn`. I also frequently define `groupOn`.
> 
> Oh yes, 'sortOn' is a really nice name. :)
> _______________________________________________
> Libraries mailing list
> Libraries at haskell.org
> http://www.haskell.org/mailman/listinfo/libraries

Huh, that name just reminded me of GHC.Exts.sortWith:

http://hackage.haskell.org/package/base-4.6.0.1/docs/GHC-Exts.html#v:sortWith

Which actually has the right type signature, but it's still implemented
as compare (f x) (f y), and for good reasons too in this case.