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Logs: liberachat/#haskell

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2021-07-07 15:54:32 tzh joins (~tzh@c-24-21-73-154.hsd1.or.comcast.net)
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2021-07-07 16:03:07 MiguelNegrao joins (~MiguelNeg@2001:818:dc71:d100:9e5a:44ff:fe17:1240)
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2021-07-07 16:05:27 <MiguelNegrao> Hi. I'd like to define a function (Arrow a, Traversable f, more constraints here...) => t (a b c) -> a (t b) (t c) Are there constraints I can add to make this possible ?
2021-07-07 16:05:49 × michalz quits (~michalz@185.246.204.126) (Remote host closed the connection)
2021-07-07 16:05:59 <MiguelNegrao> I've already implemeted it for lists (requiring ArrowChoice)
2021-07-07 16:06:35 <MiguelNegrao> and for vector-sized Vector (not requiring ArrrowChoice)
2021-07-07 16:06:57 <MiguelNegrao> https://github.com/miguel-negrao/arrow-utils/blob/main/src/Control/Arrow/Utils.hs
2021-07-07 16:09:00 × dunkeln_ quits (~dunkeln@188.70.10.207) (Ping timeout: 265 seconds)
2021-07-07 16:09:26 <MiguelNegrao> it also looks similar to traverse' :: Traversable f => p a b -> p (f a) (f b) from profunctors
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2021-07-07 16:10:36 × merijn quits (~merijn@83-160-49-249.ip.xs4all.nl) (Ping timeout: 272 seconds)
2021-07-07 16:10:57 <amesgen[m]> Is there a "standard" `StateT`-ish transformer for `Quote` from recent template-haskell?
2021-07-07 16:10:59 <jle`> MiguelNegrao: what do you want it to do?
2021-07-07 16:11:21 _ht joins (~quassel@82-169-194-8.biz.kpn.net)
2021-07-07 16:11:47 <MiguelNegrao> If I have a container of arrows, I want to create a new arrow that takes a container of inputs, applies each arrow to each input generating a container of outputs
2021-07-07 16:12:16 <MiguelNegrao> It's useful for FRP stuff with arrows
2021-07-07 16:13:33 <MiguelNegrao> On that link you can see it implemented for lists
2021-07-07 16:13:58 <MiguelNegrao> It's called sequenceArrList
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2021-07-07 16:51:05 <exarkun> Anyone know how to get a non-Haskell dependency into the latest Haskell.nix-generated Nix expressions?
2021-07-07 16:51:21 <exarkun> non-Haskell, non-nixpkgs
2021-07-07 16:51:42 <exarkun> I have an overlay defining it that worked fine with older Haskell.nix but the new recommended default.nix doesn't have an obvious place for overlays
2021-07-07 16:52:01 <exarkun> And jamming it in the non-obvious place leaves me with the failure "Setup: The pkg-config package 'libchallenge_bypass_ristretto_ffi' is required"
2021-07-07 16:52:10 <exarkun> "but it could not be found"
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2021-07-07 16:54:19 × radw quits (~radw@user/radw) (Ping timeout: 246 seconds)
2021-07-07 16:54:37 <glguy> Using GHC-8.10.5 I seem to be getting messages like "Currently only 10 to 12 is supported. System LLVM version: 9.0.1" but I was under the impression LLVM-9 was the only one supported
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2021-07-07 16:55:42 radw joins (~radw@user/radw)
2021-07-07 16:55:44 <glguy> I don't think these details matter, but: armv7l, running `cabal install cabal-install`, raspberry pi
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2021-07-07 17:01:04 <maerwald> it's just a GHC bug afair... the message is incorrect
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2021-07-07 17:05:07 <glguy> maerwald: so I should stick with 9?
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2021-07-07 17:05:52 <maerwald> glguy: https://gitlab.haskell.org/ghc/ghc/-/issues/19959
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2021-07-07 17:06:22 <glguy> maerwald: thank you
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2021-07-07 17:07:44 <monochrom> Nice, there will be a 8.10.6
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