2023/02/05

2023-02-05 00:01:16 +0000 <sm> https://leanpub.com/production-haskell has a section on it ("17.1 On Debug.Trace"). Excellent!
2023-02-05 00:02:07 +0000werneta(~werneta@70-142-214-115.lightspeed.irvnca.sbcglobal.net)
2023-02-05 00:02:57 +0000 <sm> darkling: slightly chaotic but useful trace helpers: https://hackage.haskell.org/package/hledger-lib-1.28/docs/Hledger-Utils-Debug.html
2023-02-05 00:03:55 +0000 <sm> chaotic good
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2023-02-05 00:07:12 +0000 <int-e> monochrom: actually do we know whether the pattern is dons' or dcoutts'?
2023-02-05 00:07:48 +0000 <monochrom> Oh! I don't know, maybe dcoutts instead.
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2023-02-05 00:54:31 +0000 <Hammdist> data Thing = Thing [Thing] how do I derive Arbitrary for it
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2023-02-05 01:10:52 +0000 <Hammdist> looks like arbitrary = Thing <$> arbitrary works
2023-02-05 01:13:27 +0000tessier(~treed@mobile-166-170-47-178.mycingular.net)
2023-02-05 01:13:47 +0000 <Hammdist> https://paste.ee/p/4NRL5 two questions (A) why does the input string to ptwr sometimes end in ")" and (B) why does quickcheck hang?
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2023-02-05 01:22:19 +0000 <Hammdist> it seems the extra ")" can be eliminated by passing s through show
2023-02-05 01:22:29 +0000 <Hammdist> not sure what that's about though
2023-02-05 01:22:44 +0000 <Hammdist> the hanging might be due to generation of excessively large things
2023-02-05 01:23:29 +0000 <geekosaur> monochrom has a story there, yes
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2023-02-05 01:24:10 +0000 <geekosaur> there's a decent chance that it's doing 50/50 on choice of building your tree nodes, which if you do the math leads to infinite trees
2023-02-05 01:26:22 +0000nunggu_(~q@user/nunggu)
2023-02-05 01:26:38 +0000 <Hammdist> at this point I'm not sure quickcheck is saving any time over just writing up some test cases
2023-02-05 01:27:46 +0000 <sm> 👍️
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2023-02-05 01:34:13 +0000segfaultfizzbuzz(~segfaultf@108.211.201.53)
2023-02-05 01:38:33 +0000 <c_wraith> I found myself using quickcheck in a way I don't see anyone else talk about. When I was testing a data structure, instead of generating values of the structure with it, I generated sequences of modifications. Then I'd test to ensure that all required properties held after each modification.
2023-02-05 01:39:03 +0000 <c_wraith> But the core part of it was that I wasn't generating the data structure itself
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2023-02-05 01:51:16 +0000 <sm> also note quickcheck has multiple competitors which claim to be easier to use in some ways
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2023-02-05 02:07:38 +0000 <segfaultfizzbuzz> i want gptcheck
2023-02-05 02:13:29 +0000 <int-e> . o O ( "Your code looks really excellent today. I found no single bug, except for the fact that 2 + 2 = 5." )
2023-02-05 02:13:50 +0000 <segfaultfizzbuzz> haha you joke but making up variations on realistic inputs could be pretty great
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2023-02-05 02:34:35 +0000 <sclv> i think many of the competitors are not about ease of use but specifying different sorts of search -- i.e. small and exhaustive inputs, etc
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2023-02-05 02:38:10 +0000 <sclv> vis a vis generating infinite values, i'd take a look at writing a custom generator that makes use of size, as in https://hackage.haskell.org/package/QuickCheck-2.14.2/docs/Test-QuickCheck-Gen.html#v:getSize
2023-02-05 02:39:54 +0000 <sclv> or if you're generating a list, it actually already does, and all you really need to do is add a resize or scale to each call to reduce the size as you recur.
2023-02-05 02:40:36 +0000 <sclv> or use "frequency" to give extra weight to the empty list :-)
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2023-02-05 02:40:59 +0000 <sclv> but that's only probabilistically terminating, while resizing is definitively so
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2023-02-05 06:25:25 +0000 <talismanick> Say I have a record type with 2 fields, Stmt{stmtTxt, stmtVar}
2023-02-05 06:25:42 +0000 <talismanick> How can I fmap it into another statment to assign in lexicographic order?
2023-02-05 06:25:49 +0000 <talismanick> something shorter than `(\(str, lst) -> Stmt{stmtText = str, stmtExVar = lst}`
2023-02-05 06:26:29 +0000 <talismanick> into another container*
2023-02-05 06:27:20 +0000 <Maxdamantus> looks like `uncurry Stmt` to me.
2023-02-05 06:27:50 +0000 <talismanick> thanks, it works
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2023-02-05 08:11:00 +0000 <mauke> @unpl uncurry Stmt
2023-02-05 08:11:01 +0000 <lambdabot> uncurry Stmt
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2023-02-05 08:44:05 +0000 <Athas> Man, this maintenance stuff is hard.
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2023-02-05 08:59:11 +0000 <tomsmeding> Athas: what are you maintaining
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2023-02-05 09:23:27 +0000 <int-e> composure?
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2023-02-05 10:49:28 +0000 <Guest8275> vHey Everyone , My name is Utsav from india currently pursuing B.tech wants to contribute in Haskell ,Please anyone tell me how to contribute in this..
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2023-02-05 13:07:05 +0000 <maerwald[m]> Guest8275: the language?
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2023-02-05 13:40:04 +0000vgtw(~vgtw@user/vgtw)
2023-02-05 13:43:58 +0000 <stefan-_> when I run `stack test/run` all source files will be re-compiled most of the time, even if only 1 file was changed
2023-02-05 13:44:02 +0000 <stefan-_> I use intellij-haskell as IDE
2023-02-05 13:44:19 +0000 <stefan-_> any ideas how the recompilation can be avoided?
2023-02-05 13:48:33 +0000 <byorgey> stefan-_: see https://github.com/commercialhaskell/stack/issues/4977 for some workarounds
2023-02-05 13:50:28 +0000merijn(~merijn@c-001-001-010.client.esciencecenter.eduvpn.nl)
2023-02-05 13:56:55 +0000 <stefan-_> byorgey, thanks, I also found this: https://github.com/rikvdkleij/intellij-haskell/issues/475
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2023-02-05 14:29:43 +0000[itchyjunk](~itchyjunk@user/itchyjunk/x-7353470)
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2023-02-05 14:34:44 +0000 <Hammdist> is Data.List.Index.imap the recommended way to map with index?
2023-02-05 14:37:09 +0000 <Hammdist> Data.List.Index doesn't seem to be installed by default
2023-02-05 14:39:20 +0000ec(~ec@gateway/tor-sasl/ec) (Ping timeout: 255 seconds)
2023-02-05 14:41:20 +0000ec(~ec@gateway/tor-sasl/ec)
2023-02-05 14:42:56 +0000 <mniip> Hammdist, zipping with [0..] is the standard way in the code bases I've seen
2023-02-05 14:43:24 +0000 <mniip> Or you might want to zip with [1..]!
2023-02-05 14:43:49 +0000freeside(~mengwong@103.252.202.170)
2023-02-05 14:43:50 +0000 <mniip> One of those cases where factoring out a function is not a particularly great idea
2023-02-05 14:45:39 +0000jakalx(~jakalx@base.jakalx.net) (Error from remote client)
2023-02-05 14:51:21 +0000 <yushyin> or indexed functor from one of the lens libraries
2023-02-05 15:00:50 +0000jakalx(~jakalx@base.jakalx.net)
2023-02-05 15:09:59 +0000 <tomsmeding> going from `map f l` to `zipWith f [0..] l` is such an easy change, and the resulting code has such obvious meaning, that indeed factoring that out into a function would only be worth it if in a particular piece of code you happen to need this pattern _many_ times
2023-02-05 15:16:45 +0000jakalx(~jakalx@base.jakalx.net) ()
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2023-02-05 17:05:00 +0000segfaultfizzbuzz(~segfaultf@108.211.201.53)
2023-02-05 17:05:08 +0000 <segfaultfizzbuzz> https://www.pcmag.com/news/chatgpt-passes-google-coding-interview-for-level-3-engineer-with-183k-s…
2023-02-05 17:05:32 +0000 <segfaultfizzbuzz> which soup kitchens does #haskell regard as the best?
2023-02-05 17:06:05 +0000 <L29Ah> borscht
2023-02-05 17:06:13 +0000 <[exa]> the ones operated by chatgpt.
2023-02-05 17:06:35 +0000 <Rembane> I wonder how good ChatGPT would do as a level three engineer at Google.
2023-02-05 17:06:41 +0000 <[exa]> oh man I can't wait for the time when the programmers will finally be obsolete
2023-02-05 17:07:07 +0000 <Rembane> [exa]: What are you gonna do when that happens?
2023-02-05 17:07:15 +0000 <[exa]> operate the soup kitchen
2023-02-05 17:07:35 +0000 <L29Ah> replace your obsolete programmers with Microsoft® AI© CodeWorkers™ now!
2023-02-05 17:08:01 +0000coot(~coot@2a02:a310:e241:1b00:ec1a:e9df:79ac:66ba) (Quit: coot)
2023-02-05 17:08:43 +0000 <[exa]> like, AFAIK a pretty big chunk of google's workforce is dealing with&supporting people who invest in ads, and the chatgpt may save millions there
2023-02-05 17:08:45 +0000oldsk00l(~znc@ec2-18-133-247-9.eu-west-2.compute.amazonaws.com)
2023-02-05 17:09:13 +0000 <Rembane> That sounds good
2023-02-05 17:09:21 +0000 <segfaultfizzbuzz> L29Ah: type error: not a soup kitchen
2023-02-05 17:10:01 +0000 <L29Ah> segfaultfizzbuzz: ENOENT
2023-02-05 17:10:03 +0000 <segfaultfizzbuzz> [exa]: lol
2023-02-05 17:10:18 +0000 <[exa]> kinda reminds me of birchpunk btw, I wonder what these guys do now
2023-02-05 17:10:26 +0000 <segfaultfizzbuzz> birchpunk?
2023-02-05 17:10:56 +0000 <[exa]> search it on youtube, it's quite eastern but good
2023-02-05 17:13:18 +0000 <segfaultfizzbuzz> i mean tbh i am not sure i am a better programmer than chatgpt
2023-02-05 17:13:29 +0000 <[exa]> (OT danger: here https://www.youtube.com/watch?v=RCH2PTj93fs )
2023-02-05 17:18:20 +0000 <Hammdist> (x where x = 7) <-- why doesn't this work? what is the syntax for where?
2023-02-05 17:18:32 +0000 <segfaultfizzbuzz> [exa]: hedge computing is funny but unfortunately aside from that i didn't really find that funny :-/
2023-02-05 17:19:13 +0000 <segfaultfizzbuzz> [exa]: you owe me the completion of a tutorial on how to make a graph reducer, unfortunately i am a little too busy at the moment to follow through on that
2023-02-05 17:19:46 +0000 <[exa]> segfaultfizzbuzz: ah yeah, well I'm around, feel free to ask
2023-02-05 17:20:40 +0000 <segfaultfizzbuzz> "ChatGPT is probably outputting at least 22x the volume of human Twitter users ever day... and the equivalent of the entire printed works of humanity every 14 days" -- lol
2023-02-05 17:21:19 +0000 <[exa]> Hammdist: AFAIK `where` is only valid around definitions, i.e. y=x where x=7 works
2023-02-05 17:21:33 +0000 <segfaultfizzbuzz> yeah if you do the calculations on the IO bandwith of all of humanity and the IO bandwith of a high end GPU the difference is rather stark
2023-02-05 17:23:08 +0000 <segfaultfizzbuzz> at 96 wpm one person is producing 8 bytes per second (let's forget about compressability, the actual number is significantly lower...)
2023-02-05 17:24:17 +0000 <segfaultfizzbuzz> so all of humanity (10^10 people) is 80 GB per second if everyone is awake simultaneously
2023-02-05 17:24:59 +0000 <[exa]> but they also talk and make the weird faces and accents
2023-02-05 17:25:18 +0000 <segfaultfizzbuzz> the actual sustainable rate is much lower than that, and the actual output entropy is much lower
2023-02-05 17:25:34 +0000 <segfaultfizzbuzz> so all of humanity is probably like 1 GB per second or something like that
2023-02-05 17:26:05 +0000 <[exa]> you should count only "externally useful output", it's gonna be quite low tbh. Anyway let's move to #-offtopic I guess
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2023-02-05 17:57:49 +0000 <segfaultfizzbuzz> https://reviews.llvm.org/D118029 -- speak of the devil: "We are introducing branchless variants for sort3, sort4 and sort5. These sorting functions have been generated using Reinforcement Learning and aim to replace sort3, sort4 and __sort5 variants for integral types."
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2023-02-05 17:59:02 +0000 <segfaultfizzbuzz> what is Random_4 in this, does that mean sorting 4 elements which come from a random distribution?
2023-02-05 17:59:21 +0000 <segfaultfizzbuzz> like uiformly random distribution? they got like 60% speedups for that
2023-02-05 17:59:56 +0000 <monochrom> Wrong channel?
2023-02-05 18:01:05 +0000econo(uid147250@user/econo)
2023-02-05 18:01:05 +0000 <segfaultfizzbuzz> ok well we were just joking around about chatgpt replacing all of us, and then llvm lands some kind of reinforcement-learning originated sorting contribution
2023-02-05 18:05:14 +0000 <int-e> ...what happened to sorting networks...
2023-02-05 18:05:41 +0000 <int-e> (that's the keyword that *should* be in there)
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2023-02-05 18:17:29 +0000 <tomsmeding> not sure what the Machine Learning (tm) produced sorting functions are, they seem to be the ones in libcxx/include/__algorithm/sort.h here? https://reviews.llvm.org/rG194d1965d2c841fa81e107d19e27fae1467e7f11
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2023-02-05 18:17:51 +0000 <tomsmeding> if so, those are _tiny_, and indeed look like classical sorting networks
2023-02-05 18:18:05 +0000 <tomsmeding> they're only 6 primitives long!
2023-02-05 18:18:07 +0000_leo___(~emmanuelu@user/emmanuelux)
2023-02-05 18:18:48 +0000 <int-e> TBH I'm inclined to believe that "reinforcement learning" is a joke here. After all that's how humans learn too.
2023-02-05 18:19:40 +0000 <tomsmeding> I suspect it's not a joke, and it's a decent way to come up with these networks if that's your thing, but you know, superoptimisation is a field that exists
2023-02-05 18:19:59 +0000 <tomsmeding> and surely there are less hypey ways to produce sorting networks of length 6
2023-02-05 18:20:26 +0000 <tomsmeding> I'd expect fancy machine learning to be helpful once you get to length 20 or so
2023-02-05 18:20:41 +0000 <tomsmeding> at that point any kind of brute-force search is hopeless
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2023-02-05 18:47:34 +0000 <sclv> *weird al voice* "this network is ony six prims long"
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2023-02-05 22:43:29 +0000adium(adium@user/adium) (Ping timeout: 260 seconds)
2023-02-05 22:44:38 +0000 <Inst_> question
2023-02-05 22:44:51 +0000 <Inst_> why is it possible to define a class that can't be instanced into?
2023-02-05 22:45:06 +0000adium(adium@user/adium)
2023-02-05 22:45:07 +0000 <Inst_> class Lol where; topkek = "kek"
2023-02-05 22:50:01 +0000 <jackdk> https://reasonablypolymorphic.com/blog/abusing-constraints/
2023-02-05 22:52:12 +0000danso(danso@danso.ca) (Quit: ZNC - https://znc.in)
2023-02-05 22:53:28 +0000 <int-e> Inst_: Hmm you can instantiate that, once. So you could use this to declare a "global" function that is instantiated later... (it's global in the sense that you can only define it once, but you will carry Foo => constraints everywhere you use it and it will be passed as an argument as a result)
2023-02-05 22:54:24 +0000 <int-e> Or Lol => in your case.
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2023-02-05 22:58:29 +0000danso(danso@danso.ca) (Client Quit)
2023-02-05 22:59:01 +0000 <Inst_> nice, thanks
2023-02-05 23:00:44 +0000danso(~danso@danso.ca)
2023-02-05 23:02:28 +0000bilegeek(~bilegeek@2600:1008:b098:686c:1177:15a4:77ec:44a0)
2023-02-05 23:02:37 +0000offtherock(~blurb@96.45.2.121)
2023-02-05 23:03:19 +0000 <jackdk> Sandy also defines a couple in the link I posted
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2023-02-05 23:04:26 +0000rburkholder(~blurb@96.45.2.121)
2023-02-05 23:04:32 +0000 <Inst_> weird, not working on ghc
2023-02-05 23:04:37 +0000 <Inst_> erm, ghci
2023-02-05 23:06:02 +0000 <int-e> % class Foo where foo :: Int; foo = 42
2023-02-05 23:06:02 +0000 <yahb2> <interactive>:18:1: error: ; • No parameters for class ‘Foo’ ; (Enable MultiParamTypeClasses to allow no-parameter classes) ; • In the class declaration for ‘Foo’
2023-02-05 23:06:18 +0000 <int-e> % :set -XMultiParamTypeClasses
2023-02-05 23:06:18 +0000 <yahb2> <no output>
2023-02-05 23:06:21 +0000 <int-e> % class Foo where foo :: Int; foo = 42
2023-02-05 23:06:21 +0000 <yahb2> <no output>
2023-02-05 23:06:28 +0000 <int-e> % instance Foo where foo = 23
2023-02-05 23:06:28 +0000 <yahb2> <no output>
2023-02-05 23:06:31 +0000 <int-e> % foo
2023-02-05 23:06:31 +0000 <yahb2> 23
2023-02-05 23:06:47 +0000rburkholder(~blurb@96.45.2.121) (Remote host closed the connection)
2023-02-05 23:07:09 +0000 <int-e> (just `instance Foo` would pick the default implementation `foo = 42`)
2023-02-05 23:09:28 +0000rburkholder(~blurb@96.45.2.121)
2023-02-05 23:09:55 +0000 <Inst_> no, i mean, i can't get auto constraints via type inference, but I guess Sandy McGuire points out
2023-02-05 23:10:12 +0000 <Inst_> how nullary typeclasses aren't a misfeature
2023-02-05 23:10:57 +0000czy(~user@host-140-21.ilcub310.champaign.il.us.clients.pavlovmedia.net) (ERC 5.4.1 (IRC client for GNU Emacs 30.0.50))
2023-02-05 23:10:58 +0000 <Inst_> int-e: i was more complaining that I couldn't get ghc to type infer the constraint
2023-02-05 23:11:19 +0000 <jackdk> see also: HasCallStack
2023-02-05 23:11:22 +0000 <geekosaur> % :t foo
2023-02-05 23:11:22 +0000 <yahb2> foo :: Int
2023-02-05 23:11:27 +0000 <int-e> Ah I see, type inference doesn't work for this.
2023-02-05 23:11:38 +0000 <int-e> geekosaur: that's after providing the instance
2023-02-05 23:11:54 +0000 <int-e> Before that you get "No instance for Foo arising from a use of ‘foo’"
2023-02-05 23:12:21 +0000 <int-e> But you /can/ do let x :: Foo => Int; x = foo
2023-02-05 23:13:05 +0000 <int-e> (maybe newer ghci is better, still using 8.10 by default here)
2023-02-05 23:14:32 +0000 <int-e> % :!ghci --version
2023-02-05 23:15:02 +0000nunggu_(~q@user/nunggu) (Quit: nunggu_)
2023-02-05 23:15:46 +0000 <int-e> % :show linker
2023-02-05 23:15:46 +0000 <yahb2> ----- Linker state ----- ; Pkgs: [base-4.14.3.0, integer-gmp-1.0.3.0, ghc-prim-0.6.1, ; rts-1.0.1] ; Objs: [] ; BCOs: [LinkableM (2022-06-14 17:45:33.292275656 UTC) Yahb2Defs ; [BC...
2023-02-05 23:16:03 +0000 <int-e> Looks like that's ghc-8.10.7 too.
2023-02-05 23:16:08 +0000segfaultfizzbuzz(~segfaultf@108.211.201.53)
2023-02-05 23:16:14 +0000 <int-e> based on the version of `base.
2023-02-05 23:16:59 +0000 <int-e> % print GHC.Version.cProjectVersion
2023-02-05 23:16:59 +0000 <yahb2> "8.10.7"
2023-02-05 23:19:09 +0000 <Inst_> int-e: so why bother with type inference, then?
2023-02-05 23:19:16 +0000 <Inst_> erm, the constraint, then?
2023-02-05 23:20:10 +0000 <int-e> Inst_: I don't know; maybe this is why I've never seen this pattern used :P
2023-02-05 23:20:33 +0000 <Inst_> i can stuff a constraint in, the utility seems to be being able to stuff comments into an arbitrary nullary constraint
2023-02-05 23:20:35 +0000 <Inst_> weird feature
2023-02-05 23:21:04 +0000 <int-e> In any case there's no reason for the compiler to disallow it. And evidently (see above) it can be abused to do something actually useful.
2023-02-05 23:21:28 +0000 <geekosaur> the compiler lets you do other useless things too…
2023-02-05 23:22:07 +0000czy(~user@host-140-21.ilcub310.champaign.il.us.clients.pavlovmedia.net)
2023-02-05 23:22:19 +0000 <int-e> Inst_: I mean, compared to changing all functiont to `Int -> a`, if you have `Foo => a` instead you're (mostly; ghc's overlap check isn't perfect) guaranteed that every such function will receive the same value, statically.
2023-02-05 23:22:31 +0000 <geekosaur> @let Just _ = Nothing -- unusable top level binding so never discovers the pattern match fails
2023-02-05 23:22:33 +0000 <lambdabot> Defined.
2023-02-05 23:22:50 +0000harveypwca(~harveypwc@2601:246:c180:a570:3828:d8:e523:3f67) (Quit: Leaving)
2023-02-05 23:22:58 +0000 <int-e> Inst_: maybe there's a place where this kind of thing has value
2023-02-05 23:23:02 +0000int-eshrugs
2023-02-05 23:23:03 +0000eggplantade(~Eggplanta@2600:1700:38c5:d800:e5a6:1cca:cd92:c20)
2023-02-05 23:23:03 +0000unit73e(~emanuel@2001:818:e8dd:7c00:656:e5ff:fe72:9d36)
2023-02-05 23:23:08 +0000danza(~francesco@151.44.152.227) (Read error: Connection reset by peer)
2023-02-05 23:23:17 +0000 <geekosaur> I think the only use I've seen for that was some kind of hacker contest
2023-02-05 23:23:32 +0000 <Inst_> w/e, it's exotic, and I guess it's Haskelly to let people mess around and find ways to abuse nullary typeclasses
2023-02-05 23:25:19 +0000czy`(~user@host-140-21.ilcub310.champaign.il.us.clients.pavlovmedia.net)
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2023-02-05 23:25:59 +0000tromp(~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl) (Quit: My iMac has gone to sleep. ZZZzzz…)
2023-02-05 23:28:24 +0000 <int-e> Inst_: The fact that `:t foo` breaks when there's no instance indicates that people don't really use this feature; that smells like a bug and I would be surprised if it was super difficult to fix.
2023-02-05 23:29:39 +0000 <Inst_> okay, posting to GHC issues now
2023-02-05 23:29:50 +0000stiell(~stiell@gateway/tor-sasl/stiell)
2023-02-05 23:29:56 +0000 <int-e> maybe there is one already?
2023-02-05 23:31:53 +0000 <unit73e> good thing there's a log or I'd get very confused since I just joined
2023-02-05 23:32:18 +0000jinsunGuest5295
2023-02-05 23:32:19 +0000jinsun__(~jinsun@user/jinsun)
2023-02-05 23:32:19 +0000Guest5295(~jinsun@user/jinsun) (Killed (cadmium.libera.chat (Nickname regained by services)))
2023-02-05 23:32:19 +0000jinsun__jinsun
2023-02-05 23:33:10 +0000eggplantade(~Eggplanta@2600:1700:38c5:d800:e5a6:1cca:cd92:c20) (Remote host closed the connection)
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2023-02-05 23:35:54 +0000 <Inst_> done
2023-02-05 23:35:55 +0000 <Inst_> https://gitlab.haskell.org/ghc/ghc/-/issues/22907
2023-02-05 23:36:26 +0000 <Inst_> tried nullary typeclass, nullary type parameter
2023-02-05 23:36:44 +0000 <jackdk> int-e: That would force every caller of a HasCallStack function to add it to their context, no?
2023-02-05 23:37:51 +0000 <int-e> Inst_: Where's the "where" keyword?
2023-02-05 23:38:02 +0000 <Inst_> class Foo works
2023-02-05 23:38:45 +0000danza(~francesco@151.47.50.166)
2023-02-05 23:38:54 +0000 <int-e> % :quit
2023-02-05 23:38:54 +0000 <yahb2> <no output>
2023-02-05 23:38:57 +0000 <int-e> % class Foo
2023-02-05 23:38:57 +0000 <yahb2> <no output>
2023-02-05 23:39:06 +0000 <int-e> % u :: Foo => Int; u = 3
2023-02-05 23:39:06 +0000 <yahb2> <no output>
2023-02-05 23:39:10 +0000 <int-e> % u
2023-02-05 23:39:10 +0000 <yahb2> <interactive>:8:1: error: ; • No instance for Foo arising from a use of ‘u’ ; • In the expression: u ; In an equation for ‘it’: it = u
2023-02-05 23:39:14 +0000 <int-e> % :t u
2023-02-05 23:39:14 +0000 <yahb2> <interactive>:1:1: error: ; • No instance for Foo arising from a use of ‘u’ ; • In the expression: u
2023-02-05 23:39:32 +0000 <Inst_> % :quit
2023-02-05 23:39:32 +0000 <yahb2> <no output>
2023-02-05 23:39:38 +0000 <Inst_> %: class Foo where
2023-02-05 23:39:45 +0000 <Inst_> % u :: Foo => Int; u = 3
2023-02-05 23:39:45 +0000 <yahb2> <interactive>:4:6: error: ; Not in scope: type constructor or class ‘Foo’
2023-02-05 23:39:58 +0000 <Inst_> % class Foo where
2023-02-05 23:39:58 +0000 <yahb2> <no output>
2023-02-05 23:40:02 +0000 <Inst_> % u :: Foo => Int; u = 3
2023-02-05 23:40:02 +0000 <yahb2> <no output>
2023-02-05 23:40:03 +0000 <Inst_> u
2023-02-05 23:40:05 +0000 <Inst_> % u
2023-02-05 23:40:05 +0000 <yahb2> <interactive>:10:1: error: ; • No instance for Foo arising from a use of ‘u’ ; • In the expression: u ; In an equation for ‘it’: it = u
2023-02-05 23:40:13 +0000 <Inst_> % instance Foo
2023-02-05 23:40:13 +0000 <yahb2> <no output>
2023-02-05 23:40:18 +0000 <Inst_> % u
2023-02-05 23:40:18 +0000 <yahb2> 3
2023-02-05 23:40:46 +0000 <int-e> all that is expected
2023-02-05 23:40:47 +0000czy(~user@host-140-21.ilcub310.champaign.il.us.clients.pavlovmedia.net) (Remote host closed the connection)
2023-02-05 23:40:57 +0000 <Inst_> % :quit
2023-02-05 23:40:57 +0000 <yahb2> <no output>
2023-02-05 23:40:58 +0000 <int-e> what isn't expected (to me) is that :t u fails
2023-02-05 23:42:52 +0000 <int-e> and, relatedly, that defining non-monomorphic functions using Foo also fails: v () = u gives a type error instead of inferring v :: Foo => () -> Int
2023-02-05 23:44:23 +0000 <int-e> Inst_: if you expand the "steps to reproduce" in the description, it will be a much better report.
2023-02-05 23:44:39 +0000tessier(~treed@mobile-166-170-47-107.mycingular.net) (Ping timeout: 252 seconds)
2023-02-05 23:47:05 +0000 <Inst_> done, as per requested