Abstracting over constraints: Can this be implemented in GHC?

[Alexander Berntsen]

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On 07/11/14 16:36, Richard Eisenberg wrote:
> or an explicit type application, once those are available
Speaking of. Who's working on those? How are they progressing?

While this is a nightmare:
(f :: (Show x, Show y) => (forall a. Show a => a -> d) -> (x, y) ->
(d, d)) show (1.2, False)

Something like this would be acceptable:
(f @ Show) show (1,2, False)


But it's still the Wrong Thing, in my opinion.
- -- 
Alexander
alexander at plaimi.net
https://secure.plaimi.net/~alexander
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