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Logs on 2021-09-05 (liberachat/#haskell)

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00:55:04 <hololeap> I've got a type T that is isomorphic to type V, but is not a newtype wrapper. I want to use DerivingVia to reuse an instance that exists for V, and apply it to T. how can I do this?
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01:06:16 <pavonia> hololeap: Adding "via V" to the deriving clause doesn't work?
01:10:28 <hololeap> pavonia: http://sprunge.us/KqFw3S
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01:14:00 <pavonia> Hhm, no idea then
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01:19:45 <hololeap> there is "4.3 - Deriving via isomorphisms" from the "Deriving Via" paper but it's ugly and confusing
01:21:00 <geekosaur> there comes a point where it's easier to just write the damn thing yourself...
01:21:32 <hololeap> "Note that the via type does not have to be a newtype. The only restriction is that it is coercible with the original data type."
01:22:08 <hololeap> so how do I make my Range type coercible with These?
01:22:30 <geekosaur> hm. does that mean Data.Coerce? because that would exclude what you're trying to do, representationally equivalent isn't enough
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01:23:45 <geekosaur> you can look at the docs for Data.Coerce but iirc you can't get there from here
01:23:57 <hololeap> oh, I see what it's saying
01:24:54 <geekosaur> and I din't think you're allowed to wreite your own Coercible instance
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01:27:11 <hololeap> yeah it doesn't give you any way to do that
01:27:53 <hololeap> so is this as good as it gets, without making Range a newtype? http://sprunge.us/R6uAmH
01:28:16 <hololeap> I just want more meaningful constructor names, but that semigroup instance is annoying to write by hand
01:29:10 <geekosaur> probably
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01:30:29 <pavonia> What additional properties are required for the Coercible instance?
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01:31:07 <geekosaur> they have to bve directly or indirectly related, not just representationally equivalent
01:31:44 <geekosaur> basically the compiler has to be able to follow a chain of internally-generated Coercible instances to relate the two types
01:34:23 <pavonia> Not sure what that means. For what kind of types does such a relation exist?
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01:35:38 <hololeap> pavonia: basically just some arbitrary number of newtype wrappings, from what I can tell
01:36:28 <hololeap> if you can morph one type into another type by wrapping/unwrapping it in nothing but newtypes, they will be coercible
01:36:36 <geekosaur> https://downloads.haskell.org/ghc/latest/docs/html/libraries/base-4.15.0.0/Data-Coerce.html
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01:40:55 <pavonia> What does "class a ~R# b" denote?
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01:53:10 <geekosaur> it's documented at the bottom of https://gitlab.haskell.org/ghc/ghc/-/wikis/roles-implementation
01:55:59 <geekosaur> and may correspond to the ~ρ mentioned on page 6 of http://research.microsoft.com/en-us/um/people/simonpj/papers/ext-f/coercible.pdf
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02:01:47 <pavonia> Thanks
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09:10:09 <hexeme> Trying to use the comment eval feature in vscode's haskell support, but I can't get it to actually insert the output of the evaluation result: https://i.imgur.com/fS26JBV.png
09:10:18 <hexeme> anyone familiar with this extension?
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09:14:02 <hexeme> nm
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09:26:19 <Orbstheorem> How do I debug a timeout in quickcheck properties?
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09:28:25 <Rembane_> Orbstheorem: I do it by adding loads and loads of trace and traceShow.
09:28:44 <Orbstheorem> Some elements in my test suite sporadically take very long times and I can't figure why. My guess was the generators and `suchThat` filters, but since I can't deterministically reproduce a test I can't really bisect :(
09:29:06 <Orbstheorem> Is there a way to record and reuse a test seed?
09:29:18 <Rembane_> Orbstheorem: Do you get more to play with if you add more test runs?
09:29:31 <Rembane_> Orbstheorem: Yes you can. I have only found how in tasty though.
09:29:51 <Rembane_> Orbstheorem: https://stackoverflow.com/questions/19189476/how-to-set-constant-seeds-for-haskells-quickcheck-function <- something like this perhaps?
09:31:36 <Orbstheorem> Rembane_: Not really :/
09:31:47 <Orbstheorem> Rembane_: Reading....
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09:33:59 <timCF> Hello! Is there any standard type of positive Rational in Haskell, or I just create newtype with smart constructor? Just don't want to reinvent a wheel :)
09:34:25 <dibblego> https://hackage.haskell.org/package/natural
09:34:42 <dminuoso> timCF: You can use `Ratio Unsigned`?
09:34:55 <dminuoso> Err, `Ratio Natural`
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09:35:39 <dminuoso> timCF: Consider that `type Rational = Ratio Integer`
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09:37:22 <timCF> I'll take a look, thanks!
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09:53:31 <Orbstheorem> Yes, got a reproducible failure! Thanks!
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10:01:12 <tomsmeding> Orbstheorem: there is Test.QuickCheck.Random.mkQCGen :: Int -> QCGen that creates a QCGen with a particular seed, if you don't want to use tasty
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10:01:24 <tomsmeding> there's no documentation for that function on hackage for some reason
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10:07:00 <Orbstheorem> I wrote this:... (full message at https://libera.ems.host/_matrix/media/r0/download/libera.chat/fe823de0d6ebca77f298f8fb12ff2a075df2bb12)
10:07:32 <tomsmeding> printf debugging for the win
10:08:16 <Orbstheorem> `traceShow` \o/ xD
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10:09:44 <Orbstheorem> The problem with the optimizer is that even if the seed is random the generated code is not xD
10:10:00 <Orbstheorem> Just by adding traceShow, sometimes I get the failure after 1 test and sometimes after 4 xD
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10:35:40 <Orbstheorem> Found my problem: `sublistOf [] `suchThat` (not . null)` ...
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10:38:36 <hexeme> haskell is pretty crazy but i'm having fun
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10:40:14 <Orbstheorem> I think it's the very first time I use BangPatterns x)
10:40:42 <Orbstheorem> Also, I discovered that deconstructors will force evaluation.
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10:41:10 <tomsmeding> deconstructors?
10:41:24 <Orbstheorem> Pattern matching on assignments.
10:41:42 <sshine> fun pastime: watching haskell projects compile to see what packages other people depend on. it's a pretty neat way to discover things, I think. :)
10:42:20 <Orbstheorem> x)
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10:43:48 <sshine> Orbstheorem, congrats on levelling up!
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10:44:38 <sshine> Orbstheorem, on Friday there's a Haskell Love talk on GHC's Strict mode that you may want to see, then.
10:44:46 <kaol> Huh. I have two IntMaps. Their set of keys are equal, but running intersectionWith (,) for them yields an empty IntMap. How can this be.
10:44:59 Orbstheorem googles Haskell Love
10:45:17 <Orbstheorem> Ohhhh
10:45:18 <Orbstheorem> Nice!
10:45:20 <Orbstheorem> :)
10:45:24 <sshine> Orbstheorem, https://www.youtube.com/watch?v=IQYIOZUUrNc&list=PLBqWQH1MiwBTwo2wrwINAorzXRumxO41s&index=10
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10:49:58 <tromp> please consider upvoting HN submission of my Haskell based project, https://news.ycombinator.com/item?id=28423029
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10:56:18 <[exa]> tromp: opening the github-- I thought for a moment that the chess pictures are made of unicode. :D
10:57:44 <[exa]> alas /me has no HN account
10:58:13 tomsmeding gave [exa]'s upvote
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11:34:17 <Gurkenglas> janus, are you sure "Conn handler already done..." should be nonfatal?
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11:45:53 <Gurkenglas> stack won't install old-time, wat do? https://bpa.st/XADQ --no-system-ghc didn't help
11:51:23 <jneira[m]> maybe it is related with the long paths issue, I would change STACK_ROOT env var to C:\sr and your project dir to the shortest path possible
11:51:35 <jneira[m]> Gurkenglas ^^
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11:52:56 <Gurkenglas> stack path already says stack-root: C:\sr
11:53:07 <jneira[m]> hmm
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11:54:07 <jneira[m]> but ghc is inside you user dir, you should change that config option too
11:54:39 <jneira[m]> mmm don't remember the exact name
11:55:07 <jneira[m]> local-prog-path?
11:55:14 <jneira[m]> something alike
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11:55:56 <Gurkenglas> local-bin-path presumably
11:56:05 <jneira[m]> yeah
11:57:13 <Gurkenglas> stack install Cabal fixed it.
11:57:32 <Gurkenglas> scratch that, oof
11:57:43 <tomsmeding> yeah, that didn't sound right :p
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11:58:39 <jneira[m]> wow
11:59:34 <jneira[m]> I would try to reproduce the error with a clean global config
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11:59:56 <jneira[m]> if you have time ☺️
12:01:30 <Gurkenglas> is there a simple way to get such a one? some folder or file that i rename and then overwriting it back later undoes it?
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12:17:03 <Gurkenglas> ah stack path said config-location, so i renamed that yaml. it installed another ghc and and then failed to install old-time in the same way
12:17:24 <Gurkenglas> jneira[m], ^^
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12:30:52 <Gurkenglas> hmm stack install Cabal doesn't put cabal on the path
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12:31:38 <Gurkenglas> oh wait it did, i just thought the stack bin path was different from the choco bin path.
12:39:12 <Gurkenglas> oh wait it is... stack install Cabal doesn't seem to do much of anything when i run it after this first tiem? it finishes in ~1 second and my C:\Users\Gurkenglas\AppData\Roaming\local\bin (stack path --local-bin) does not get a new cabal.exe
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12:42:07 <tomsmeding> Gurkenglas: Cabal != cabal-install
12:42:15 <tomsmeding> Cabal is the library, cabal-install is the executable
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12:42:33 <Gurkenglas> youProbablyWantCapitalCabal lied to me!?
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12:42:57 <tomsmeding> world is a hard place
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12:50:58 <jneira[m]> <Gurkenglas> "local-bin-path presumably" <- the path to ghcs and msys is controlled by local-programs-path
12:51:26 <jneira[m]> local-bin-path is where installed binaries go
12:52:51 <jneira[m]> and it is advisable to set the ghc and msys location to a short path as well
12:53:08 <Gurkenglas> why doesn't stack do this automatically
12:53:10 <jneira[m]> I would try again after change it
12:53:50 <jneira[m]> to get a fresh global cache delete C:\sr entirely
12:54:42 <jneira[m]> spaces and non ASCII chars in the user name usually gives problems too (not your case though)
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12:56:26 <jneira[m]> Gurkenglas: maybe cause it can choose a location which is known to be writable by the user for sure
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12:56:43 <jneira[m]> it cant
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12:59:25 <Gurkenglas> eh, i read out of head swapspace. ill try installing idris on wsl, then.
12:59:30 <Gurkenglas> *ran out
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13:13:43 <phaazon> do you people remember where cabal writes compilation outputs like binaries, libs, etc.?
13:13:54 <phaazon> I would swear I remember using a command like cabal path --binary
13:13:58 <phaazon> but I don’t recall exactly
13:14:11 <phaazon> I basically want to grab the built binary and sent it to a server node
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13:17:03 <phaazon> found it by manually going in the directory but I was sure there was a way to grab that
13:17:09 <phaazon> or was it with stack, hm
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13:25:04 <DigitalKiwi> cabal list-bin
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13:25:56 <phaazon> oh yeah, thanks!
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13:26:53 <DigitalKiwi> yw
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13:54:14 <wz1000> kuribas: https://gitlab.haskell.org/ghc/ghc/-/issues/17768#note_374060
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14:02:36 <Gurkenglas> ...does idris just not build on a modern resolve with allow-newer?
14:04:30 <Gurkenglas> janus, what do you use for idris? stack install idris? something something idris2?
14:09:31 <kuribas> wz1000: are you sure it's applicative do?
14:09:40 <wz1000> yes, remove it and it will work
14:09:52 <kuribas> wz1000: I did, and I got the same error?
14:10:22 <kuribas> wz1000: nice reduction!
14:11:04 <kuribas> wz1000: in any case, that should be sort enough for them to find the problem?
14:11:19 <kuribas> wz1000: or are you a ghc hacker as well?
14:12:08 <wz1000> yes
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14:16:21 <kuribas> wz1000: I am getting the same error with applicative.
14:17:08 <wz1000> with applicative?
14:17:14 <wz1000> you mean without applicative do?
14:17:17 <kuribas> wz1000: https://gist.github.com/kuribas/9bf506b79dd2690600c4c06108efae59
14:17:22 <kuribas> wz1000: yes
14:17:38 <wz1000> ApplicativeDo is enabled in that file
14:18:09 <kuribas> wz1000: oh wait, do you mean only enabling it?
14:18:15 <wz1000> yes
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14:19:00 <kuribas> weird that enabling it would break code that doesn't use it...
14:19:17 <wz1000> it does - applicativedo rewrites all do statements
14:19:29 <wz1000> *do blocks
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14:19:42 <kuribas> wz1000: so you mean the outer do block triggers it then?
14:19:47 <wz1000> yes
14:20:03 <kuribas> applicativeDo also isn't very smart.
14:20:16 <wz1000> true. It is kind of half baked
14:20:23 <wz1000> there are many open issues on the tracker
14:20:28 <kuribas> right...
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14:20:45 <kuribas> Still it's very handy together with records.
14:20:46 <wz1000> there is -optimal-applicative-do or something if you want
14:21:18 <kuribas> Otherwise you need to do "MyRecord <$> field1 <*> field2 <*> field3", and so easy to mix them up.
14:21:18 <wz1000> https://downloads.haskell.org/ghc/latest/docs/html/users_guide/exts/applicative_do.html#ghc-flag--foptimal-applicative-do
14:22:13 <kuribas> I just bypass the problem by doing do field1 <- field1A; field2 <- field2A; pure $ MyRecord {field1, field2, field3 = pureComputation}
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14:28:25 <kuribas> wz1000: that's a silly flag
14:28:42 <kuribas> why would I want "suboptimal-applicative-do"?
14:29:27 <wz1000> kuribas: because it is faster
14:31:43 tomsmeding . o O ( O(n^3), that's some heavy complexity for a compiler )
14:33:22 <kuribas> why would that need to be so slow? Isn't it just creating a graph?
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15:03:48 <ryantrinkle> is there a good tool for removing unused imports these days?
15:04:27 <ryantrinkle> i tried fix-imports, but it only removed Data.ByteString.Lazy (even though lots of other imports are unused since I just cleared a ton of stuff out of the file)
15:05:03 <ryantrinkle> i'm trying to try importify, but the version in nixpkgs doesn't build
15:05:16 <wz1000> ryantrinkle: HLS can do it
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15:06:44 <ryantrinkle> wz1000: ah ok, in-editor i guess?
15:06:58 <wz1000> yes
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15:52:59 <ryantrinkle> wz1000: any idea how to actually make emacs do it?
15:53:02 <ryantrinkle> i think i've got lsp working
15:53:21 <wz1000> look for "code actions" in your lsp client
15:53:35 <wz1000> you need to trigger it over a redundant import I think
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15:53:43 <wz1000> (which should be highlighted)
15:54:07 <wz1000> then you will get an option ("code action") to remove all redundant imports
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15:55:59 <monochrom> I use ghc's -ddump-minimal-imports
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16:21:24 <kaol> Really weird. I have two IntMaps that have equal keys. intersectionWith (,) yields an empty list. But doing IntMap.fromList . IntMap.toList on one of them makes it work. And using (==) on that variable and the one piped through that yields False. How can IntMap.fromList . IntMap.toList not be identity?
16:22:22 <geekosaur> Doubles?
16:23:10 <geekosaur> (in particular any NaNs will break the IntMap)
16:23:11 <kaol> No, I don't have any Doubles in my data.
16:23:14 <c_wraith> eh, that shouldn't matter in the values, and the keys of an IntMap are always Int
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16:23:25 <geekosaur> mm, right. sorry
16:23:37 <hpc> @where paste
16:23:37 <lambdabot> Help us help you: please paste full code, input and/or output at e.g. https://paste.tomsmeding.com
16:23:49 <hpc> can you make a minimal reproduction?
16:24:35 <kaol> I'll try.
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16:25:01 <kaol> Or at least one that doesn't require my DB for running it.
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16:26:51 <hpc> it'll be interesting to see what the root cause is
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16:36:40 <kaol> It's not reproducible without my DB (obviously) but here's the code. I had that exact same intersectionWith before but I moved it to a different function and that broke it. https://gitlab.com/piperka/piperka/-/commit/a6237d956f370208a38f9a55905d2c4297ec4a52
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16:37:29 <Gurkenglas> kaol, when you take the map to a list and back and the write it to your db and back, does that land back where it started?
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16:39:08 <kaol> My code's really not built for pushing this data back to the DB that way.
16:40:32 <Gurkenglas> kaol, presumably you checked that their keys are equal. when you do unionwith, what happens?
16:42:02 <kaol> N/A, my IntMaps have different types, can't union them. (sort $ IntMap.keys a) == (sort $ IntMap.keys b) yields True.
16:42:55 <Gurkenglas> then merge, i suppose.
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16:45:25 <hololeap> kaol, I think I see the problem
16:45:41 <kaol> I tried mergeWithKey already. Same result, empty IntMap.
16:45:47 <hololeap> Oh, nvm, this is a diff view and I was reading it wrong :/
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16:48:19 <Gurkenglas> kaol, what does size :: IntMap a -> Int say about the two?
16:48:33 <hololeap> kaol: this might be grasping at straws, but have you tried Data.IntMap.Strict?
16:48:38 <Gurkenglas> and perhaps null :: IntMap a -> Bool
16:49:34 <Gurkenglas> kaol, have you considered using the ghci debugger in this desparate circumstance? :3
16:49:36 <kaol> Yes, it didn't change anything.
16:49:47 <hpc> you're building an IntMap with fromAscList, is the input list sorted?
16:50:03 <kaol> (yes to trying Data.IntMap.Strict)
16:50:35 <hpc> (try Debug.Trace-ing as you build the IntMap)
16:51:19 <Gurkenglas> (look at the source of null and size, null won't be useful, and size is unlikely to be. i had hoped there may be an inconsistent size cache in there)
16:51:19 <kaol> Good call, that sounds like a reasonable thing that would break it.
16:51:26 <hololeap> hpc, good catch
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16:51:45 <Gurkenglas> s/look/looking/
16:51:57 <hololeap> that would explain why (IntMap.fromList . IntMap.toList) would fix it
16:52:03 <kaol> Postgresql has implicitly ordered it before but I think adding that function broke it.
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16:54:48 <kaol> Yes, after adding that ORDER BY to my query everything works again. Hopefully I won't be making same mistake again anytime soon! Thanks for pointing it out to me.
16:55:28 <hpc> yeah, the ordering was probably because scanning that index was optimal in the query plan
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17:23:04 <ryantrinkle> any idea what could cause this? Error processing message (void-function lsp-modeline-workspace-status-mode)
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17:35:13 <hololeap> lets say that there is a monoid where, forall b. `A <> b = A` and `b <> A = A` ... is there a name for A's behavior here?
17:35:50 <hpc> so like 0 in multiplication?
17:36:00 <hololeap> correct
17:36:19 <hpc> i don't know off the top of my head what the name would be, but you can start by looking at rings maybe?
17:36:23 <Gurkenglas> hololeap, https://hackage.haskell.org/package/semirings
17:36:45 <hpc> ooh yeah, zero's as good a name as any
17:37:06 <kaol> https://en.wikipedia.org/wiki/Absorbing_element
17:38:25 <hololeap> cool, thanks for the links
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18:20:44 <hexeme> i did a rotation cipher in haskell \o/
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18:21:40 <Hecate> hexeme: hurray!
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18:34:07 <janus> Gurkenglas: "Conn handler already done" just means that the library user handed a coroutine to the library that doesn't actually handle requests, but immediatly exits. It doesn't really hurt the event loop, so i am not sure why the program would need to die
18:35:23 <janus> Gurkenglas: i was thinking of maybe putting Void in the Cont for connection handler coroutines, since that would fit my HTTP2 use case just fine, and i could shave off those Result case matches
18:36:04 <janus> Gurkenglas: but on the other hand, there are protocols where you'd like to terminate the connection, and Result could serve that purpose. So I have the current situation because i don't know which way to go here
18:37:13 <janus> in related news, i found out my Cont was totally broken because i had used idris' proof search to define its methods :O gotta be careful with new toys :P
18:38:06 <Gurkenglas> You're using idris2, right? Setup was painful enough I gave up on it
18:38:23 <janus> yes, i am using master from last week
18:38:51 <janus> setup is super smooth for me, i am on ubuntu. i used to use chez from ubuntu, but now i use one from master, since i thought i had found a chez bug
18:39:05 <hexeme> Is it possible to do games in haskell? Or is it always more of a hack/trick to do that?
18:39:06 <janus> turned out it was my mistake :P
18:39:32 <hexeme> Is there a popular 2D surface/canvas library to play with?
18:40:16 <[exa]> hexeme: try Gloss
18:40:19 <Gurkenglas> janus, can you tell what silly mistake I'm making? https://bpa.st/YYPQ
18:40:23 <hexeme> thanks
18:40:25 <[exa]> hexeme: it's literally made for starting easy
18:40:41 <hexeme> I guess I need to learn how to use packages first :P
18:41:23 <janus> Gurkenglas: from that output , i can't say. looks like a shell scripting problem? are you on BSD or Mac?
18:41:32 <orcalikastecona> hexeme: Gloss is nice, +1 from me
18:41:38 <Gurkenglas> ubuntu via windows subsystem for linux
18:41:38 <hexeme> right on
18:41:54 <[exa]> hexeme: either you install it via cabal and setup ghc to include the gloss package to compilation (ghc -package gloss mygame.hs -o mygame, or so), or, much better, make a cabal package with your project and add gloss as a dependency
18:42:03 <orcalikastecona> hexeme: Are you familiar with haskell build tools like cabal or stack?
18:42:08 <[exa]> hexeme: generally, `cabal init` in an empty directory should do like 90% of it :]
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18:42:46 <hexeme> I have been reading Haskell From First Principles for a few days now, so basically just screwing around with ghcid
18:42:47 <janus> Gurkenglas: hmmm i wouldn't trust WSL2 to be fully compatible... if you have enough memory, i'd recommend having a real vm
18:42:49 <[exa]> hexeme: this is pretty useful https://wiki.haskell.org/How_to_write_a_Haskell_program#Structure_of_a_simple_project
18:42:55 <hexeme> thank you!
18:43:15 <c_wraith> janus: wsl2 works perfectly well. It's a real linux kernel, which fixed all the issues GHC had under wsl1
18:43:17 <hexeme> janus: WSL2 is pretty dope
18:43:17 <[exa]> I can't say about any kinds of ide though, I'm avoiding these things
18:43:37 <hexeme> [exa]: got that all setup in vscode
18:44:40 <hexeme> i also use nixos so i'm betting there's a nixos way to use cabal/packages
18:44:50 <janus> well, what could possibly be breaking Gurkenglas' idris build? maybe filesystem incompatibilities? how does WSL provides ext4-like guarantees on NTFS?
18:45:28 <[exa]> hexeme: yeah many people do nix with haskell, actually even the current cabal way of building and storing stuff is heavily inspired by that
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18:47:39 <shapr> hexeme: nix-shell -p cookiecutter git --run 'cookiecutter gh:utdemir/hs-nix-template'
18:47:48 <shapr> That's how I start a new Haskell project in nixos
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18:51:34 <hexeme> hmm seems to be downloading a pin of nixpkgs or something
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18:55:15 <hexeme> heh i actually ran out of disk space
18:55:18 <hexeme> wonder why it does that
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19:08:10 <bec> Hello!
19:08:18 <yushyin> hi bec
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19:09:03 <bec> I have a question about GHC warnings, is there a way to tell GHC to emit a compilation warning when a specific typeclass instance is used?
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19:11:34 <hpc> iirc there's something that's (String -> Context) which fails compilation with your message
19:13:48 <[exa]> hexeme: environment reproducibility eats space.
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19:16:36 <bec> > iirc there's something that's (String -> Context) which fails compilation with your message
19:16:38 <lambdabot> error:
19:16:38 <lambdabot> Pattern syntax in expression context: String -> Context
19:17:10 <bec> I would prefer not to fail compilation, as some people may have working codebases that would be effected.
19:18:51 <maerwald> maybe https://downloads.haskell.org/~ghc/8.10.7/docs/html/users_guide/glasgow_exts.html?highlight=deprecated#pragma-DEPRECATED
19:19:31 <hpc> bec: yeah, but that would be a place to start looking - if i was a standard library author i would define an equivalent for compiler warnings and put that in the same module
19:22:27 <maerwald> move the instance to its own module, add module-level WARNING pragma
19:22:54 <maerwald> users will get a compile error when upgrading, need to read the changelog and can still keep their codebases running
19:23:28 <maerwald> and don't be afraid of orphan instances
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19:32:10 <bec> Thanks Maerwald, that's a good idea! I'll try it.
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19:46:12 <raehik> How do I make a "closeable" channel for concurrent communication in Haskell? So I can send a bunch of jobs, have them consumed by workers, then have the workers close themselves when all jobs are done
19:47:27 <raehik> I found the stm-chans package through an old snoyberg blog post, but I can't find too much literature/usage of it. want to confirm that I'm looking in the right place
19:48:03 <tomsmeding> bec: the thing you were thinking of was probably https://hackage.haskell.org/package/base-4.15.0.0/docs/GHC-TypeLits.html#t:TypeError but that's an error, not a warning
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19:50:10 <hpc> raehik: Chan is garbage-collected and forkIO threads go away when their action is complete, if you want to go simple
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19:51:27 <raehik> hpc: but how do I indicate that a channel of a s is closed? not just empty
19:51:42 <raehik> -- assuming I'm not using the stm-chans pkg
19:52:29 <bec> tomsmeding I was looking for something that would make a warning, but it seems I'm out of luck. I'm trying maerwald's idea, but I'm not sure it will work since warnings in method instances don't trigger.
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19:53:36 <bec> My idea was to add an overlapping instance B to an overlapped instance A, having in mind that I could make it so when the instance B is used, a warning is emitted.
19:53:59 <maerwald> bec: the warning is module level
19:54:12 <bec> But it seems this is not easy.
19:54:17 <maerwald> why?
19:54:43 <maerwald> the warning will be emitted when you import the module
19:55:26 <bec> If that's so, the warning would be emitted inside the library rather than in the code using the library, and resolving to this particular instance.
19:56:07 <Hecate> hohai bec
19:56:09 <bec> I want the warning to be emitted not when the module is imported, but when the compiler resolves to that instance.
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19:57:03 <bec> Hi Hecate :)
19:57:04 <Hecate> bec: yeah I don't think we have a nice middle ground between TypeError and DEPRECATED
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19:58:26 <hpc> raehik: you'd send something over the channel that indicates the end of it
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19:58:44 <hpc> and then on the other side do the appropriate cleanup
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19:59:03 <bec> Hecate: even with DEPRECATED, I don't really know whether it would trigger.
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19:59:43 <raehik> hpc: but I have multiple threads reading from the channel, if I send 1 thing it'll only get caught once
19:59:53 <hpc> ah right
20:00:15 <raehik> stm-chans and snoyberg's post both have solutions -- I'm just kind of unsure why those solutions aren't in a more major library
20:01:40 <hpc> iirc with regular Chans you can make one that is broadcast
20:01:46 <hpc> maybe stm-chans has something similar
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20:02:01 <hpc> then you have two Chans, one for the job queue and one for control
20:03:11 <maerwald> bec: no, the users imports the module
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20:04:34 <hpc> and if you want to interrupt jobs in progress you get into signals, which i don't enjoy thinking about so i couldn't help you with that
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20:04:56 <hpc> er, not signals - async exceptions
20:05:13 <hpc> (too much time writing bash lol)
20:06:29 <bec> maerwald: that would be too breaking for too little benefit I believe.
20:06:34 <raehik> hpc: right, thanks, a separate control queue makes sense
20:07:08 <maerwald> bec: well, it's a reasonable way to tell you users API changed and force them to read the changelog
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20:07:31 <maerwald> the fix will take 5 minutes
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20:07:49 <bec> maerwald: besides, the pattern covered by this instance is also covered by another, overlapped instance, so people falling in the warning trap wouldn't notice.
20:08:05 <raehik> hpc: ah, stm-chans actually does that exactly. it's just a (TQueue a, TVar Bool). now I understand why it's separate!
20:08:20 <hololeap> type instance Output Dependency t = Output DepVersion t
20:08:27 <bec> It's not an api change, the goal is to add a warning on a subset of an existing instance that may be ambiguous for the users.
20:08:42 <hololeap> The type family application ‘Output DepVersion t’ is no smaller than the instance head ‘Output Dependency t’ (Use UndecidableInstances to permit this)
20:08:49 <hpc> ah, nice
20:08:53 <hololeap> can someone explain to me what this means?
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20:09:56 <hpc> when the compiler does instance resolution, it wants to know that resolution will always terminate
20:09:58 <tomsmeding> hololeap: presumably nr 2 in https://downloads.haskell.org/ghc/latest/docs/html/users_guide/exts/type_families.html#decidability-of-type-synonym-instances
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20:10:43 <hpc> "smaller" has a specific meaning, which... that link explains
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20:11:45 <tomsmeding> monochrom enlightened me to the quality of ghc's user guide
20:12:42 <hpc> yeah, it's easy to forget it's there
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20:13:21 <hpc> here's another one for you, next time someone asks for resources to learn haskell point them to https://www.haskell.org/documentation/
20:13:30 <hpc> instead of a dozen different specific links
20:13:49 <tomsmeding> I'm not even sure whether giving a beginner 10 links instead of 1 is better
20:13:54 <tomsmeding> but it's certainly fairer
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20:14:33 <hpc> it gets them in the habit of going to haskell.org too
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20:14:50 <hololeap> ok, what confuses me is that it gives this error when I have: data Dependency = Dependency DepVersion Category Name
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20:15:09 <hololeap> but if I have: data Dependency' a b c = Dependency a b c
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20:15:33 <hololeap> and: type Dependency = Dependency' DepVersion Category Name
20:15:44 <hololeap> then that same code no longer requires UndecidableInstances
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20:16:10 <hpc> the heuristic doesn't cross data definitions
20:16:18 <hpc> it sees "data Dependency" and "data DepVersion"
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20:16:30 <tomsmeding> well, the number of symbols in "Output DepVersion t" is certainly smaller than the number of symbols in "Output (Dependency' DepVersion Category Name) t"
20:16:55 <hololeap> ok, so it's that simple of a heuristic, then
20:17:06 <hpc> yeah
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20:17:20 <tomsmeding> nobody said that ghc was smart ;)
20:17:24 <hpc> the heuristic for type classes is even simpler
20:17:28 <hololeap> haha :)
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20:52:29 <hololeap> is there a standard way to convert UTF-8 characters to their closest ASCII equivalent (if there is one)? For instance, Ǘ would become U and ƈ would become c
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20:55:07 <hpc> iconv's transliteration mode can do it
20:55:15 <hpc> characters that can't translate become '?'
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20:55:27 <hpc> not sure what it would do for those specific characters
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20:56:00 <hololeap> ok, it might not even come up, but it was something I just thought of
20:56:13 <hpc> ah, that works perfectly
20:56:18 <hpc> $ iconv -t ascii//TRANSLIT
20:56:18 <hpc> is there a standard way to convert UTF-8 characters to their closest ASCII equivalent (if there is one)? For instance, Ǘ would become U and ƈ would become c
20:56:21 <hpc> is there a standard way to convert UTF-8 characters to their closest ASCII equivalent (if there is one)? For instance, U would become U and c would become c
20:56:41 <hpc> https://hackage.haskell.org/package/iconv
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20:58:55 <hololeap> hpc, thanks
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20:58:59 <Alex_test> https://zen.yandex.ru/media/id/5c8f50adaedd2500b361ff31/liudi-ili-postliudi-kriterii-opredeleniia-postchelovechestva-v-fantastike-61344f2a3df852715d3bc812
20:59:22 <stevenxl> 👋
20:59:47 <maerwald> do I want to click that?
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21:01:49 <hololeap> it's some kind of russian blog post...
21:02:00 <shapr> Alex_test: is that about Haskell?
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21:03:04 <hexeme> I have a simple app that renders a circle animation using Gloss. I found the fsnotify library that allows you to execute a function when some files change. Can anyone help me integrate fsnotify into my small animation application, so that when any file changes, the animation stops and the program exits gracefully?
21:03:06 <hexeme> https://gist.github.com/dustinlacewell/63953e45061087725388cc0b387c288f#file-gloss-hs
21:03:53 <hololeap> shapr: no, it's about posthumanity in sci-fi writing...
21:04:35 <hexeme> I'm brand new to haskell so I appologize ahead of time if I need some hand holding :X
21:04:58 <shapr> Alex_test: please keep non-haskell discussions to a different channel
21:05:15 <AlexZenon> <shapr> Alex_test: is that about Haskell? � missed the channel
21:05:43 <shapr> AlexZenon: Is that a bot written in Haskell? If yes, is the source online?
21:05:43 <hexeme> I included a snippet from the fsnotify library to demonstrate its use in the gist.
21:06:40 <Alex_test> shapr: ����� ��� ���? � �� ���!
21:07:28 <AlexZenon> shapr: my test user
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21:09:05 <hololeap> hexeme: you probably want to set up a `Chan Bool` to hold the state of whether or not anything has changed, then use that same Chan to stop the gloss loop
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21:09:39 <hexeme> hololeap: Is it asking too much if maybe you could demonstrate with an edit?
21:09:50 <hexeme> googling chans in the meantime
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21:11:16 <hexeme> fwiw, I think gloss has a `simulate` function as an alternative to `animate` which can take a state object
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21:11:26 <hexeme> but i'm at the bleeding edge of my knowledge of gloss here :D
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21:13:07 <hexeme> I'm thinking simulate may be needed to store/use the chan
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21:14:05 <hololeap> you'll need to be in the IO monad to read the Chan, so the IO variations of the interface will be needed
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21:14:31 <hololeap> and you'll need a way to stop the loop, which I don't see in any of those interfaces
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21:15:32 <janus> is there a bot for telling people things when they come back online?
21:15:48 <janus> !later tell satan go to hell
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21:16:24 <shapr> @tell janus hello there!
21:16:24 <lambdabot> Consider it noted.
21:17:19 <shapr> janus: now you say something in a channel lambdabot is also in, and you get a notification
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21:18:44 <enikar> there is also memoserv: /msg memoserv help
21:19:18 <hexeme> hololeap: I found a comment saying: "just call exitWith in input or step wherever you would check the condition, if all the chips have been eaten. exitWith is polymorphic in a an can be called in any IO a context, whatever a is. So IO world is ok."
21:19:25 <hexeme> does that help?
21:19:59 <int-e> :t System.Exit.exitWith
21:20:01 <lambdabot> GHC.IO.Exception.ExitCode -> IO a
21:20:26 <janus> shapr: very cool, thank you
21:20:32 <int-e> :t System.Exit.ExitSuccess
21:20:33 <lambdabot> GHC.IO.Exception.ExitCode
21:20:53 <int-e> :t System.Exit.ExitFailure
21:20:54 <lambdabot> Int -> GHC.IO.Exception.ExitCode
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21:22:27 <int-e> (A rather rare function to use IME, because exiting the whole program is not compositional.)
21:22:55 <hexeme> i am trying to achieve a kind of "live coding" with gloss and ghcid
21:23:05 <int-e> Though technically that just raises an exception that could be caught.
21:23:08 <hexeme> but i need the app to gracefully die when a file changes
21:24:22 <janus> enikar: ooh excellent! looks like an official service, i guess it is better suited for people who hang with lambdabot
21:24:31 <janus> *who don't hang
21:26:04 <enikar> indeed. But it works only on libera
21:26:44 <janus> are there IRC networks other than libera with a FP community?
21:27:20 <enikar> i don't know
21:27:32 <hololeap> maybe OFTC
21:28:55 <enikar> there is a #haskell on oftc.
21:29:29 <janus> i never used oftc, but i am weird, i try to keep my channel count under 10 so the channels are easily accessible :P
21:30:06 <sm> I wouldn't think so, really. Non-IRC chats ? Definitely (zulip, discord.. ?)
21:30:16 <enikar> but it's not busy
21:30:52 <janus> yeah there is also an FP slack and tapas mentioned it on the new Haskell Interlude
21:31:01 <janus> irc wasn't even mentioned ;)
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21:32:05 <hpc> /r/haskell
21:32:31 <sm> ouch!
21:32:45 <sm> and of course, matrix
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21:42:33 <janus> will stack try hackage if it can't find a package in stackage?
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21:44:10 <EvanR> what's Haskell Interlude
21:44:28 <cafkafk> janus spitting sick bars
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21:48:26 <janus> EvanR: the podcast launched by the haskell.foundation : https://haskell.foundation/podcast/
21:51:07 <geekosaur> janus: stack is about reproducible builds and predefined snapshots. you ncan point to a package on hackage but it won't automatically look there
21:52:06 <janus> geekosaur: hmm ok. i was trying to figure out what happened to Lambda_Lifter here: https://www.reddit.com/r/haskell/comments/phw8tf/implicithie_on_microsoft_windows_10/
21:52:37 <janus> i wonder if it is possible to use vscode with hie in wsl, maybe that works better?
21:53:22 <janus> but if ghcup can install hie, maybe it can also do that on windows? maybe that is the path of least resistance for their students
21:53:45 <geekosaur> my understanding is that a built-in implicit hie environment has been around for some hie versions, so implicit-hie was desupported
21:53:57 <geekosaur> so my guess is they need to update their resolver
21:54:18 <janus> right, so lts-16.27 is 8.8.4, too old for hls?
21:55:11 <geekosaur> looks like it has hls, no idea if that hls has implicit cradles
21:57:13 <geekosaur> hls was under pretty heavy development at that time
21:57:19 <janus> argh, so many possibilities, it's impossible to recommend anything without trying it out myself...
21:58:45 <janus> but 16.27 is just half a year ago... wasn't it under a similar amount of development as now?
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22:04:03 <janus> i wrote them something about the lts version that they may consider upgrading from
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23:19:36 <hexeme> Got that haskell hot-reloading working with Gloss
23:19:38 <hexeme> pretty cool
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23:30:51 <janus> Lambda_Lifter on that Reddit thread wants to stick with 8.8.4 because they think that if 8.10.8 is released, HLS will switch to that, but it won't switch from 8.8.4.
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23:31:26 <janus> does that make sense? it seems perverse to me that one would used an abandoned series just because HLS will continue to support its last release
23:32:24 <geekosaur> I stuck to 8.10.4 which is still hls-supported… but then I don't actually use hls so I don't really care much
23:33:01 <janus> i'm thinking, a new HLS is likely to drop 8.8.4 support. so by staying on HLS, you may be _unable_ to upgrade HLS
23:33:07 <janus> *staying on 8.8
23:33:38 <monochrom> But GHC HQ is really trying to avoid having a 8.10.8.
23:33:57 <janus> right, i know. right now, i just want to argue against staying with 8.8.4 because i don't think it makes sense
23:34:07 <int-e> monochrom: easy, just release 8.10.9 next?
23:34:29 <janus> if 8.10.8 were to come out, and a new HLS comes out, surely that new HLS would support both 8.10.7, 8.10.8 ? so there is no advangage with sticking to 8.8.4
23:34:52 <janus> there is actually a disadvantage, since the new HLS _more_ likely to not support 8.8.4
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23:45:55 <janus> new HLS releases support multiple patch releases. I think the false assumption of Lambda_Lifter is that HLS somehow only supports the latest patch release. But that is not the case
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23:47:48 <geekosaur> maybe they're using ghcup and don't enable "show all versions" so they think only the latest release in each major version is supported at all?
23:48:05 <geekosaur> except for those in the 3-major-versions window
23:48:17 <geekosaur> er, 2-major-versions
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23:48:59 <janus> they mention a stack lts release and they mention VsCode. So I think the worry is really about VsCode autoupdating HLS. I don't know how the Stack version could be an issue since their Stack LTS should be fixed and would imply the exact GHC version used
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23:49:50 <janus> maybe the confusion is because you can probably write "lts-18" and you'll keep getting updated to patch GHC versions which HLS wouldn't support yet
23:50:12 <janus> meanwhile, if you write "lts-16", you won't get that problem.
23:50:21 <janus> is that correct?
23:50:43 <geekosaur> dunno, I don't use stack
23:51:54 <janus> it seems to be correct, search for "short-cut" here: https://docs.haskellstack.org/en/stable/GUIDE/
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23:58:04 <hololeap> hexeme: https://github.com/hololeap/gloss-fsnotify
23:58:14 <hololeap> this was actually a bit trickier than I expected
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All times are in UTC on 2021-09-05.