2024/11/15

2024-11-15 00:03:51 +0100 <jackdk> carbolymer: I don't understand your suggestion. The typeclass I want to type-family-ify exists and I cannot change it (concrete example: `GHC.Records.HasField`), but I want a type family that can select the field type. This example fails with "The RHS of an associated type declaration mentions out-of-scope variable ā€˜zā€™ All such variables must be bound on the LHS" https://www.irccloud.com/pastebin/4aygJmq9/MakeATypeFamily.hs
2024-11-15 00:06:26 +0100rvalue-(~rvalue@user/rvalue) rvalue
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2024-11-15 00:19:05 +0100 <carbolymer> jackdk: ah, you can't modify the original class - that' s though
2024-11-15 00:20:06 +0100 <carbolymer> s/though/tough
2024-11-15 00:24:54 +0100nek0(~nek0@user/nek0) (Quit: The Lounge - https://thelounge.chat)
2024-11-15 00:26:44 +0100 <carbolymer> jackdk: maybe something in this direction https://paste.tomsmeding.com/Og2LnIpN ?
2024-11-15 00:29:03 +0100 <jackdk> The problem is I didn't know `a` at the time. (I was trying to write some servant-flavoured stuff, and wanted to provide an analogue to `ToServantApi` that extracted a single field). So I don't actually know the final type (because there are other TFs involved) but I know GHC does
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2024-11-15 00:30:32 +0100 <carbolymer> ah
2024-11-15 00:31:05 +0100ljdarj1(~Thunderbi@user/ljdarj) ljdarj
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2024-11-15 00:48:36 +0100 <sm> @where+ wiwik https://gotchamana.github.io/wiwinwlh What I Wish I Knew When Learning Haskell, Stephen Diehl
2024-11-15 00:48:37 +0100 <lambdabot> Good to know.
2024-11-15 00:48:39 +0100 <sm> found!
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2024-11-15 02:45:04 +0100m5zs7k(aquares@web10.mydevil.net) m5zs7k
2024-11-15 02:47:08 +0100 <zero> funny how haskell classes inherit the same problem as oop inheritence
2024-11-15 02:47:27 +0100 <zero> pun intended i guess
2024-11-15 02:51:19 +0100 <Axman6> Multiple (problem) inheritance
2024-11-15 02:52:48 +0100 <monochrom> What is the problem?
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2024-11-15 03:08:22 +0100gmg(~user@user/gehmehgeh) gehmehgeh
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2024-11-15 03:19:08 +0100 <Axman6> it makes sorting out the will much more difficult
2024-11-15 03:19:27 +0100 <monochrom> haha
2024-11-15 03:25:46 +0100Square(~Square@user/square) Square
2024-11-15 03:29:14 +0100 <EvanR> one problem with oop inheritance, usually, is joe schmoe want's his class to inherit from multiple other classes simultaneously. It's a problem either because you aren't allowed to do it, or because you are allowed to do it (e.g. in python)
2024-11-15 03:29:24 +0100 <EvanR> not sure how that translates to haskell
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2024-11-15 03:36:00 +0100talismanick(~user@2601:644:937c:ed10::ae5) talismanick
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2024-11-15 04:04:11 +0100 <sm> I guess: long chains of dependency make the whole system more brittle ?
2024-11-15 04:05:02 +0100 <sm> I don't know about multiple inheritance either but suspect that's the root problem
2024-11-15 04:07:12 +0100yisef(~yisef@122.10.198.17)
2024-11-15 04:07:15 +0100 <sm> https://en.wikipedia.org/wiki/Multiple_inheritance#The_diamond_problem
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2024-11-15 04:18:51 +0100Katarushisu6(~Katarushi@finc-20-b2-v4wan-169598-cust1799.vm7.cable.virginm.net) Katarushisu
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2024-11-15 04:21:07 +0100Katarushisu6Katarushisu
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2024-11-15 04:48:11 +0100 <EvanR> in "type classes vs the world" he shows a slide with a diamond dependency, and basically type classes, nothing bad happens
2024-11-15 04:48:19 +0100 <EvanR> s/basically/because/
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2024-11-15 04:49:14 +0100 <EvanR> because there's only ever zero or one instances for a given type
2024-11-15 04:49:39 +0100 <EvanR> so if you arrive at a dependency along different routes it's the same instance
2024-11-15 04:52:40 +0100ShannonB(~ShannonB@user/ShannonB) ShannonB
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