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Logs: liberachat/#haskell

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2021-08-03 08:09:56 xsperry joins (~as@user/xsperry)
2021-08-03 08:14:03 <merijn> Anyone know if cabal.project supports conditionals?
2021-08-03 08:14:33 <sclv> i suspect not
2021-08-03 08:14:55 <merijn> Rats
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2021-08-03 08:20:47 <timCF> Hello! I have a question, why `ExceptT e m a` is not a bifunctor? I can use its Functor instance to map over `a`, and `withExceptT` to map over `e`, but can not use `bimap` to do both at the same time.
2021-08-03 08:21:08 <merijn> timCF: Because the types don't line up
2021-08-03 08:21:19 <merijn> Bifunctor applies to the last two type arguments
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2021-08-03 08:21:34 <timCF> Because of `m`?
2021-08-03 08:21:38 <merijn> "ExceptT e" can't be a bifunctor, because the kind of 'm' doesn't match
2021-08-03 08:22:38 <timCF> Yes, I see. I think I'll just continue to use `fmap` + `withExceptT` then. Thanks!
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2021-08-03 08:51:30 <delYsid> :t fromMaybe <*> Just
2021-08-03 08:51:30 <lambdabot> b -> b
2021-08-03 08:52:07 <delYsid> I know it works, I even remember the trick since a few months and can write it out when I need it. But why? Working the types out makes me dizzy somehow
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2021-08-03 08:52:20 <merijn> Applicative instance of ((->) r)
2021-08-03 08:52:48 <delYsid> oh, it works in the function applicative? Thats why it can copy the arg!
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