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2021-05-06 01:54:06 acro joins (~acro@unaffiliated/acro)
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2021-05-06 02:09:03 <cdsmith> Ugh, I'm too tired to think, and I want a concat-like thing, but (Traversable t, Applicative f) => t (f (t a)) -> f (t a).  This seems like it should be obvious...
2021-05-06 02:09:37 olligobber joins (olligobber@gateway/vpn/privateinternetaccess/olligobber)
2021-05-06 02:09:55 <cdsmith> % :t fmap concat . sequenceA
2021-05-06 02:09:55 <yahb> cdsmith: (Traversable t, Applicative f) => t (f [a]) -> f [a]
2021-05-06 02:10:04 × Natch quits (~Natch@c-e070e255.014-297-73746f25.bbcust.telenor.se) (Read error: Connection reset by peer)
2021-05-06 02:10:07 <cdsmith> Okay, that's it, yeah
2021-05-06 02:11:11 <edwardk> :t fmap join . sequence
2021-05-06 02:11:13 <lambdabot> (Traversable m, Monad m, Monad f) => m (f (m a)) -> f (m a)
2021-05-06 02:11:38 <edwardk> :t fmap join . sequenceA
2021-05-06 02:11:39 <lambdabot> (Monad m, Traversable m, Applicative f) => m (f (m a)) -> f (m a)
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2021-05-06 02:24:38 <cdsmith> TH question: reifyInstances will look up instances for a type.  However, for example, `reifyInstances ''Show [ ConT ''String ]` returns `Show a0 => Show [a0]`.  Is there any way to get TH to actually unify the types and recognize that a0 ~ Char, and that the context is already satisfied?  Or is that asking too much?
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2021-05-06 02:33:18 <infinisil> @djinn (Traversable t, Applicative f) => t (f (t a)) -> f (t a)
2021-05-06 02:33:18 <lambdabot> Error: Class not found: Traversable
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2021-05-06 02:35:41 <edwardk> infinisil: djinn sucks at handling classes
2021-05-06 02:35:49 <edwardk> cdsmith: too much to ask ;)
2021-05-06 02:36:02 stree joins (~stree@68.36.8.116)
2021-05-06 02:36:19 <infinisil> Hmm..
2021-05-06 02:36:25 <cdsmith> @djinn Applicative f => [f [a]] -> f [a]
2021-05-06 02:36:25 <lambdabot> Error: Undefined type []
2021-05-06 02:36:38 × cdsmith quits (49cf15a2@c-73-207-21-162.hsd1.ga.comcast.net) (Quit: Connection closed)
2021-05-06 02:36:50 cdsmith joins (49cf15a2@c-73-207-21-162.hsd1.ga.comcast.net)
2021-05-06 02:37:07 <cdsmith> Huh
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2021-05-06 02:41:50 <cdsmith> edwardk: Okay, I kinda figured that, but... since GHC is there, I hoped it could maybe do the things GHC is good at. :(
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2021-05-06 02:48:14 <olligobber> % :t fmap fold . sequenceA
2021-05-06 02:48:14 <yahb> olligobber: (Monoid b, Traversable t, Applicative f) => t (f b) -> f b

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