Proposal: add 'equating' function to Data.List

[Alexander Berntsen]

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- -1 because I'm not convinced this belongs in Data.List. comparing is
in Data.Ord and is:

Data.Ord comparing :: Ord a => (b -> a) -> b -> b -> Ordering

So equating should be in Data.Eq, with:

equating :: Eq a => (b -> a) -> b -> b -> Bool

Furthermore I do not like your definition, and would prefer:

equating p x y = (p x) == (p y)


With these issues amended, I'm 0 on the proposal.
- -- 
Alexander
alexander at plaimi.net
https://secure.plaimi.net/~alexander
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