Proposal: Adding on

[Christian Maeder]

Nils Anders Danielsson schrieb:
> On Fri, 03 Nov 2006, Duncan Coutts <duncan.coutts at worc.ox.ac.uk> wrote:
> 
>>    groupBy ((==) `on` fst)
> 
> Read it as "group by equality on first".
> 
>> vs groupBy (equating fst)
> 
>> So do you suggest that we deprecate and remove comparing?
> 
> Yes, this seems like a good idea. (I had forgotten that comparing was
> added before 6.6 was released.) I can add a deprecation pragma to my
> patch. Any objections?

Yes, "comparing" is mentioned in "ThingsToAvoid". Adding "equating" does
do no harm. Style choices should be left to the user.

Christian