2023/10/26

2023-10-26 00:00:46 +0200 <Inst_> welp, looks like lucid doesn't provide parsing
2023-10-26 00:00:49 +0200sansk_(~sansk@072-238-128-073.res.spectrum.com) (Ping timeout: 258 seconds)
2023-10-26 00:00:51 +0200 <Inst_> and html-parse is dead for 9.6, afaik
2023-10-26 00:01:45 +0200 <c_wraith> that doesn't look like a dependency set that would break on higher GHC versions
2023-10-26 00:01:51 +0200sansk(~sansk@user/sansk) (Ping timeout: 260 seconds)
2023-10-26 00:02:06 +0200 <c_wraith> It just looks like the base constraint is unnecessarily tight
2023-10-26 00:02:40 +0200 <Inst_> attempting build with --allow-newer
2023-10-26 00:03:19 +0200 <EvanR> implicit params is great, except for the implicit part
2023-10-26 00:03:22 +0200 <Inst_> tagsoup also installs
2023-10-26 00:03:28 +0200 <probie> Inst_: If you want varargs, you can always use a list. You lose currying though, and there's a potential performance hit
2023-10-26 00:03:28 +0200sansk(~sansk@user/sansk)
2023-10-26 00:03:42 +0200 <Inst_> i know there's old libraries that do it via varargs
2023-10-26 00:03:43 +0200 <EvanR> great idea number 17 which is easier to pull off by just passing a parameter
2023-10-26 00:04:45 +0200aljazmc(~aljazmc@user/aljazmc) (Quit: Leaving)
2023-10-26 00:06:23 +0200 <c_wraith> yeah... html-parse tries to use older versions of libraries that aren't compatible with the newest ghc. But compiling it with --allow-newer will build with only a warning about the import of Data.Monoid being redundant
2023-10-26 00:06:46 +0200 <c_wraith> It could use an update fixing some bounds, but the code is fine.
2023-10-26 00:08:29 +0200Jackneill_(~Jackneill@20014C4E1E03DB0044BF7609ADF864E0.dsl.pool.telekom.hu) (Ping timeout: 258 seconds)
2023-10-26 00:13:33 +0200 <Inst_> no reason to bug ben gamari about it
2023-10-26 00:13:56 +0200 <Inst_> > import Network.HTTP.Conduit
2023-10-26 00:13:58 +0200 <lambdabot> <hint>:1:1: error: parse error on input ‘import’
2023-10-26 00:14:09 +0200 <Inst_> @import Network.HTTP.Conduit
2023-10-26 00:14:09 +0200 <lambdabot> Unknown command, try @list
2023-10-26 00:14:34 +0200 <Inst_> % import Network.HTTP.Conduit
2023-10-26 00:14:35 +0200 <yahb2> <no location info>: error: ; Could not find module ‘Network.HTTP.Conduit’ ; It is not a module in the current program, or in any known package.
2023-10-26 00:14:43 +0200 <Inst_> % :set -package http-conduit
2023-10-26 00:14:43 +0200 <yahb2> cannot satisfy -package http-conduit ; (use -v for more information)
2023-10-26 00:14:49 +0200 <Inst_> smart move :)
2023-10-26 00:21:04 +0200 <Inst_> I'm probably a reprobate for using global env
2023-10-26 00:21:16 +0200Lycurgus(~georg@user/Lycurgus) (Quit: leaving)
2023-10-26 00:21:23 +0200 <Inst_> but still love being able to call any package i want on ghci via ghci -package foo
2023-10-26 00:27:37 +0200 <nyc> Is there something better than a Data.Set from containers for moderate-sized fixed-width/size data structures e.g. 256-bit multiple precision integers? I've got a vague idea that things should exist for this.
2023-10-26 00:29:19 +0200Pickchea(~private@user/pickchea) (Quit: Leaving)
2023-10-26 00:42:31 +0200gehmehgeh(~user@user/gehmehgeh) (Quit: Leaving)
2023-10-26 00:42:37 +0200sabino(~sabino@user/sabino) (Quit: Lambda _ -> x)
2023-10-26 00:42:42 +0200 <sansk> What's the difference between Data.Map and Data.HashMap?
2023-10-26 00:43:21 +0200 <Inst_> map is a treemap, hashmap is a hashmap
2023-10-26 00:44:34 +0200 <sansk> So hashmap is more performant?
2023-10-26 00:45:39 +0200 <Inst_> depends on usecase, no?
2023-10-26 00:46:28 +0200 <sansk> For mainly insertion and lookup, which is better then?
2023-10-26 00:46:40 +0200 <EvanR> Word256 is a thing in some crypto packages
2023-10-26 00:47:08 +0200 <EvanR> I don't know what a 256-bit multiple precision integer is
2023-10-26 00:47:40 +0200 <EvanR> sansk, HashMap requires keys to be Hashable, Map requires keys to be Ord
2023-10-26 00:48:04 +0200 <EvanR> if hashing is cheaper than comparing, maybe HashMap is better
2023-10-26 00:48:33 +0200 <EvanR> if the key is Int, then IntMap is probably better
2023-10-26 00:48:36 +0200 <sansk> To be honest, I am not quite sure what hashing means exactly EvanR
2023-10-26 00:48:54 +0200 <sansk> I've only ever dealt with Map
2023-10-26 00:48:57 +0200 <EvanR> a hash function maps your key to a number
2023-10-26 00:49:32 +0200 <EvanR> a good hash function maps different keys to different numbers with high probability
2023-10-26 00:49:35 +0200 <sansk> so it's an abstraction over an array?
2023-10-26 00:49:48 +0200 <EvanR> HashMap and Map have the same API
2023-10-26 00:50:14 +0200 <EvanR> you can think of an array as a map from 0..N to values
2023-10-26 00:50:28 +0200 <EvanR> but in Map the keys don't need to be continguous
2023-10-26 00:50:35 +0200 <EvanR> contiguous
2023-10-26 00:51:41 +0200 <sansk> What do you mean by contiguous?
2023-10-26 00:52:05 +0200 <EvanR> no holes between the min and max key
2023-10-26 00:52:38 +0200 <EvanR> you could have (0,'a') (1,'b') (7,'c') in your map and that's it, unlike an array
2023-10-26 00:53:09 +0200 <sansk> would a hashmap hash it as 0, 1, 2?
2023-10-26 00:53:14 +0200 <EvanR> no
2023-10-26 00:53:37 +0200 <EvanR> since Int is an instance of Hashable you can just use Int keys if you want
2023-10-26 00:53:42 +0200 <EvanR> it works
2023-10-26 00:54:09 +0200 <sansk> so basically HashMap just converts your map to IntMap?
2023-10-26 00:54:30 +0200 <EvanR> I don't think so, no, but you can think of it like that if you want
2023-10-26 00:54:42 +0200 <EvanR> it uses hash array-mapped tries
2023-10-26 00:55:56 +0200 <sansk> what are the practical performance differences though between hashmap and map? ie what usecase would you use each for?
2023-10-26 00:56:25 +0200jmdaemon(~jmdaemon@user/jmdaemon) (Ping timeout: 255 seconds)
2023-10-26 00:56:50 +0200 <EvanR> I've never used a HashMap for anything. aeson used to? use it for the string-like keys of json objects
2023-10-26 00:57:33 +0200 <EvanR> you can find benchmarks of the various container structures around if you search, but they are benchmarks so have many grains of salt to eat while looking at
2023-10-26 00:58:06 +0200 <EvanR> because of the Ord container on Map you can treat the contents as being ordered by key which is nice. Not so with HashMap
2023-10-26 00:58:10 +0200 <EvanR> Ord constraint*
2023-10-26 00:58:45 +0200 <sansk> well im using a Map to store variables in an interpreter i am writing
2023-10-26 00:59:10 +0200 <EvanR> what type of key
2023-10-26 00:59:15 +0200 <sansk> Text
2023-10-26 00:59:51 +0200 <EvanR> Map is a good default container, if you wanted more performance you might want to not use Text as variable keys
2023-10-26 01:00:20 +0200 <EvanR> just because I know it's possible to use Int keys for that
2023-10-26 01:01:34 +0200 <sansk> i guess performance doesn't matter too much, i will probably continue using Map since its convenient
2023-10-26 01:01:44 +0200 <EvanR> it's pretty great
2023-10-26 01:04:11 +0200 <sansk> yeah, and very intuitive
2023-10-26 01:06:12 +0200emmanuelux_(~emmanuelu@user/emmanuelux)
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2023-10-26 01:49:22 +0200emmanuelux_(~emmanuelu@user/emmanuelux) (Read error: Connection reset by peer)
2023-10-26 01:50:15 +0200 <yin> is there a reason to prefer shared mutable state explicitly with MVar etc to passing state around in true functional style?
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2023-10-26 01:51:00 +0200_leo___(~emmanuelu@user/emmanuelux)
2023-10-26 01:51:15 +0200 <jackdk> You might want multiple concurrent threads sharing the state
2023-10-26 01:52:41 +0200 <geekosaur> or shared with callbacks, which can't receive the current value (only the value when the callback was registered) in pure functional style, and certainly can't update it
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2023-10-26 01:57:04 +0200sansk(~sansk@user/sansk) (Quit: WeeChat 4.0.4)
2023-10-26 02:00:35 +0200 <Axman6> I love coming across cool packages you've hever heard of, replace-attoparsec looks amazing, I love (and am also terrified by) this example: streamEditT (char '{' *> manyTill anyChar (char '}')) (fmap T.pack . getEnv) "- {HOME} -" ==> "- /home/jbrock -"
2023-10-26 02:01:31 +0200hpc(~juzz@ip98-169-35-163.dc.dc.cox.net) (Quit: Lost terminal)
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2023-10-26 02:16:14 +0200 <yin> is MVar really needed in the websockets sample server example? https://github.com/jaspervdj/websockets/blob/master/example/server.lhs
2023-10-26 02:16:19 +0200Inst_(~Inst@120.244.192.250) (Ping timeout: 245 seconds)
2023-10-26 02:17:39 +0200 <yin> my understanding is that withPingThread is concurrent but I'm not sure (only today i started looking into concurrent haskell)
2023-10-26 02:20:08 +0200 <EvanR> you really need multiple threads to handle simultaneous client dialogs
2023-10-26 02:20:29 +0200 <EvanR> you can do any concurrent set of tasks with 1 thread by interleaving manually but it's a pain in the ass
2023-10-26 02:21:03 +0200 <EvanR> splitting it into dedicated threads spawned on client connect simplifies it a lot
2023-10-26 02:22:02 +0200 <EvanR> if the threads need to coordinate at all you need something like MVar, or TVar, or sometimes just an IORef will work
2023-10-26 02:24:50 +0200[_](~itchyjunk@user/itchyjunk/x-7353470)
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2023-10-26 02:36:32 +0200 <jackdk> Axman6 often raves about the `atomicModifyIORef'` trick in place of using `MVar`
2023-10-26 02:46:03 +0200 <geekosaur> if that's all you need, sure
2023-10-26 02:47:04 +0200ryanbooker(uid4340@id-4340.hampstead.irccloud.com)
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2023-10-26 03:17:48 +0200 <c_wraith> they have really different operational semantics under write load. it's important to have both options available depending on your use cases
2023-10-26 03:22:41 +0200emmanuelux(~emmanuelu@user/emmanuelux)
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2023-10-26 04:02:03 +0200 <[Leary]> nyc: In principle, Data.IntSet should be generalised to sets of arbitrary bit strings (there may be a package for this; data-inttrie looks promising), but in practice you can perhaps get away with `IntMap (IntMap (IntMap IntSet))`. If you want to represent dense regions compactly, a finger tree of dense intervals (membership bit arrays with offsets) is extremely efficient.
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2023-10-26 05:04:34 +0200 <Axman6> My preference for the single atomically modified IORef thing came form a paper looking at implementing concurrent data structures in Haskell using all the usual tricks you'd see in imperative languages, and the highest performing implementation IIRC across the board was just using an immutable structure in an IORef, because the contention on that ref is much cheaper to deal with than pretty much any opther scheme that usually needs multiple atomic variables
2023-10-26 05:06:17 +0200kilolympus(~kilolympu@31.205.200.235)
2023-10-26 05:08:59 +0200 <lockywolf> Is there a way to not make cabal hardcode paths when building/installing?
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2023-10-26 05:34:38 +0200 <monochrom> lockywolf: No. But there is a way to set environment variables at run time to change them.
2023-10-26 05:38:44 +0200srk_(~sorki@user/srk)
2023-10-26 05:40:47 +0200 <lockywolf> hackage server
2023-10-26 05:41:17 +0200 <lockywolf> issues
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2023-10-26 05:55:49 +0200 <lockywolf> sorry, wrong window
2023-10-26 06:00:52 +0200 <lockywolf> If I may ask someone to cosider this issue, it would be great: https://github.com/haskell/hackage-server/issues/1261
2023-10-26 06:03:45 +0200 <Axman6> Finally found the paper for the concurrent data structures/IORef stuff above: http://simonmar.github.io/bib/papers/concurrent-data.pdf
2023-10-26 06:04:16 +0200_ht(~Thunderbi@28-52-174-82.ftth.glasoperator.nl)
2023-10-26 06:04:34 +0200 <Axman6> lockywolf: this probably isn't the best place to get the attention of the hackage developers, #hackage or #haskell-infrastructure might be better places
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2023-10-26 06:10:46 +0200Lycurgus(~georg@li1192-118.members.linode.com)
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2023-10-26 06:11:49 +0200fryguybob(~fryguybob@cpe-24-94-50-22.stny.res.rr.com)
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2023-10-26 06:45:10 +0200 <c_wraith> Axman6: I've had highly concurrent services fall over on the thundering herd caused by atomic CAS retries on a single hyper-overloaded IORef. admittedly, pushing everything through one IOref was a bad design, but the quick fix of changing it to an MVar worked to keep the service from collapsing in those conditions.
2023-10-26 06:46:19 +0200kantokuen(~kantokuen@user/kantokuen) (Ping timeout: 245 seconds)
2023-10-26 06:49:34 +0200qqq(~qqq@92.43.167.61)
2023-10-26 06:50:10 +0200kantokuen(~kantokuen@user/kantokuen)
2023-10-26 06:50:29 +0200 <Axman6> Yeah there are definitely situations where it makes sense - I feel that if your updates to ther IORef are relatively expensive, you might be able to spread out that contention (particularly when using atomicModifyIORef')
2023-10-26 06:50:51 +0200random-jellyfish(~tiber@2a02:2f04:11e:c600:3081:413f:53c6:da60)
2023-10-26 06:50:52 +0200random-jellyfish(~tiber@2a02:2f04:11e:c600:3081:413f:53c6:da60) (Changing host)
2023-10-26 06:50:52 +0200random-jellyfish(~tiber@user/random-jellyfish)
2023-10-26 06:52:22 +0200euleritian(~euleritia@ip4d16fc38.dynamic.kabel-deutschland.de) (Ping timeout: 272 seconds)
2023-10-26 06:53:18 +0200rosco(~rosco@yp-150-69.tm.net.my) (Quit: Lost terminal)
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2023-10-26 06:54:20 +0200 <lockywolf> I think this patch should be more or less what is needed: https://github.com/haskell/hackage-server/issues/1261#issuecomment-1780412728
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2023-10-26 07:50:18 +0200 <liamzy__> tomsmeding: what happened to your mergesort?
2023-10-26 07:59:20 +0200simendsjo(~user@84.211.91.241)
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2023-10-26 09:47:33 +0200jinsunGuest3908
2023-10-26 09:47:33 +0200Guest3908(~jinsun@user/jinsun) (Killed (osmium.libera.chat (Nickname regained by services)))
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2023-10-26 10:23:08 +0200Lycurgus(~georg@user/Lycurgus)
2023-10-26 10:25:40 +0200Lycurgus(~georg@user/Lycurgus) (Client Quit)
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2023-10-26 12:00:08 +0200arahael(~arahael@119-18-2-212.771202.syd.nbn.aussiebb.net)
2023-10-26 12:05:24 +0200pretty_dumm_guy(trottel@gateway/vpn/protonvpn/prettydummguy/x-88029655) (Quit: WeeChat 3.5)
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2023-10-26 12:16:00 +0200jjhoo(~jahakala@user/jjhoo) (Ping timeout: 272 seconds)
2023-10-26 12:16:07 +0200 <danse-nr3> runtime system crashes always shock me a bit
2023-10-26 12:17:31 +0200jjhoo(~jahakala@user/jjhoo)
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2023-10-26 12:32:50 +0200vglfr(~vglfr@88.155.140.136) (Read error: Connection reset by peer)
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2023-10-26 12:56:36 +0200_xor(~xor@72.49.199.93) (Read error: Connection reset by peer)
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2023-10-26 13:02:26 +0200pretty_dumm_guy(trottel@gateway/vpn/protonvpn/prettydummguy/x-88029655) (Quit: WeeChat 3.5)
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2023-10-26 13:05:20 +0200__monty__(~toonn@user/toonn)
2023-10-26 13:06:28 +0200_xor(~xor@72.49.199.93) (Read error: Connection reset by peer)
2023-10-26 13:07:42 +0200falafel(~falafel@62.175.113.194.dyn.user.ono.com)
2023-10-26 13:08:45 +0200_xor(~xor@72.49.199.93)
2023-10-26 13:11:03 +0200danse-nr3(~francesco@151.47.64.199) (Ping timeout: 240 seconds)
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2023-10-26 13:15:33 +0200arahael(~arahael@119-18-2-212.771202.syd.nbn.aussiebb.net) (Quit: leaving)
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2023-10-26 13:17:27 +0200_xor(~xor@72.49.199.93) (Read error: Connection reset by peer)
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2023-10-26 13:20:45 +0200_xor(~xor@72.49.199.93) (Read error: Connection reset by peer)
2023-10-26 13:21:20 +0200xff0x(~xff0x@ai101218.d.east.v6connect.net)
2023-10-26 13:23:03 +0200_xor(~xor@72.49.199.93)
2023-10-26 13:24:28 +0200_xor(~xor@72.49.199.93) (Read error: Connection reset by peer)
2023-10-26 13:25:29 +0200 <srk> I've managed to produce one today using unsafeCoerce. I wonder it this is a valid use for it https://paste.rs/3jD0W.hs and if it is possible to rewrite it using just coerce. (it seems to work currently, unsafeCoerce seems fine for a testsuite only instance but still)
2023-10-26 13:26:44 +0200_xor(~xor@72.49.199.93)
2023-10-26 13:26:50 +0200 <srk> (forall is redundant, leftover from previous attempts)
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2023-10-26 13:45:26 +0200kilolympus(~kilolympu@31.205.200.235) (Quit: See you later! :))
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2023-10-26 14:00:05 +0200simendsjo(~user@84.209.170.3)
2023-10-26 14:01:38 +0200Unicorn_Princess(~Unicorn_P@user/Unicorn-Princess/x-3540542)
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2023-10-26 14:03:59 +0200coco(~user@p5dd9a20e.dip0.t-ipconnect.de)
2023-10-26 14:04:03 +0200 <coco> hi
2023-10-26 14:04:34 +0200 <coco> I'm passing --no-install-ghc to stack, but it still downloads ghc. What am I doing wrong?
2023-10-26 14:06:30 +0200waleee(~waleee@h-176-10-144-38.NA.cust.bahnhof.se)
2023-10-26 14:18:24 +0200danse-nr3(~francesco@151.47.64.198)
2023-10-26 14:23:21 +0200 <danse-nr3> srk, which type of crash was that? Segmentation fault?
2023-10-26 14:24:55 +0200coco(~user@p5dd9a20e.dip0.t-ipconnect.de) (Remote host closed the connection)
2023-10-26 14:25:16 +0200vpan(~vpan@212.117.1.172)
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2023-10-26 14:28:27 +0200danse-nr3(~francesco@151.47.64.198) (Read error: Connection reset by peer)
2023-10-26 14:28:42 +0200danse-nr3(~francesco@151.44.128.52)
2023-10-26 14:30:06 +0200 <srk> danse-nr3: yes, but that's kind-of expected when you mis-use unsafe* stuff
2023-10-26 14:31:17 +0200random-jellyfish(~tiber@2a02:2f04:11e:c600:3458:8bb4:861c:95b2)
2023-10-26 14:31:17 +0200random-jellyfish(~tiber@2a02:2f04:11e:c600:3458:8bb4:861c:95b2) (Changing host)
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2023-10-26 18:16:07 +0200 <danse-nr3_> what is the term of part of a module path as in Term1.Term2.Module?
2023-10-26 18:16:51 +0200 <c_wraith> as far as Haskell-the-language is concerned, it's all just the module name.
2023-10-26 18:17:06 +0200lbseale(~quassel@user/ep1ctetus) (Quit: https://quassel-irc.org - Chat comfortably. Anywhere.)
2023-10-26 18:17:15 +0200 <danse-nr3_> yeah did not find anything more specific in haskell.org/onlinereport/modules.html. Cheers
2023-10-26 18:17:15 +0200 <c_wraith> module names may contain dots. those dots do not imply any sort of hierarchy or relationship, internally
2023-10-26 18:18:00 +0200lbseale(~quassel@user/ep1ctetus)
2023-10-26 18:19:09 +0200 <EvanR> I don't understand the context-free grammar for that
2023-10-26 18:19:18 +0200 <EvanR> modid
2023-10-26 18:19:36 +0200 <EvanR> it's defined as a conid, but those don't have periods?
2023-10-26 18:20:29 +0200 <c_wraith> err. I'm seeing "modid → {conid .} conid"
2023-10-26 18:21:06 +0200 <EvanR> ok I was looking at haskell 98
2023-10-26 18:21:19 +0200 <c_wraith> ah, yes. Haskell98 did not allow . in module names
2023-10-26 18:21:35 +0200Square3(~Square4@user/square) (Ping timeout: 240 seconds)
2023-10-26 18:21:48 +0200 <c_wraith> Though that was added very shortly thereafter
2023-10-26 18:21:48 +0200 <EvanR> a simpler time!
2023-10-26 18:22:14 +0200 <danse-nr3_> my fault had that link in my history ...
2023-10-26 18:22:56 +0200 <c_wraith> "Because they are allowed to be mutually recursive, modules allow a program to be partitioned freely without regard to dependencies"
2023-10-26 18:23:15 +0200 <c_wraith> Oh, if only that were practically true in GHC....
2023-10-26 18:24:05 +0200vpan(~vpan@212.117.1.172) (Quit: Leaving.)
2023-10-26 18:26:03 +0200 <EvanR> GHC is imperfect, my code runs on platonic haskell
2023-10-26 18:26:14 +0200 <EvanR> in the platonic realm
2023-10-26 18:26:41 +0200fendor(~fendor@2a02:8388:1640:be00:8798:5fe9:9ffe:940c)
2023-10-26 18:34:36 +0200tzh(~tzh@c-71-193-181-0.hsd1.or.comcast.net)
2023-10-26 18:37:41 +0200 <carbolymer> a nix related question, how can I add tools to my devshell here: https://gitlab.com/carbolymer/haskell-sandbox/-/blob/master/flake.nix?ref_type=heads#L45 ?
2023-10-26 18:37:58 +0200danse-nr3_(~francesco@151.43.173.25) (Ping timeout: 255 seconds)
2023-10-26 18:42:03 +0200euleritian(~euleritia@ip4d16fc38.dynamic.kabel-deutschland.de) (Read error: Connection reset by peer)
2023-10-26 18:42:45 +0200euleritian(~euleritia@ip4d16fc38.dynamic.kabel-deutschland.de)
2023-10-26 18:43:47 +0200 <srk> carbolymer: mkShell
2023-10-26 18:44:46 +0200 <tomsmeding> @tell liamzy__ https://github.com/haskell/play-haskell/issues/25
2023-10-26 18:44:47 +0200 <lambdabot> Consider it noted.
2023-10-26 18:45:03 +0200 <tomsmeding> not that I think they'll take that nick again, but perhaps
2023-10-26 18:47:26 +0200dcoutts(~duncan@cpc69402-oxfd27-2-0-cust903.4-3.cable.virginm.net) (Ping timeout: 258 seconds)
2023-10-26 18:52:10 +0200 <carbolymer> srk: doesn't seem to be exactly what I need - it tries to recompile packages: https://bpa.st/ABIA
2023-10-26 18:54:33 +0200 <[Leary]> carbolymer: Try `devShells.default = pkgs.haskellPackages.shellFor { packages = hp: [ hp.haskellSandbox ]; nativeBuildInputs = [ tool1 tool2 ... ]; };`
2023-10-26 18:54:44 +0200Tuplanolla(~Tuplanoll@91-159-68-236.elisa-laajakaista.fi)
2023-10-26 18:57:07 +0200 <carbolymer> [Leary]: seems to be it, thanks!
2023-10-26 19:02:25 +0200dcoutts(~duncan@cpc69402-oxfd27-2-0-cust903.4-3.cable.virginm.net)
2023-10-26 19:04:58 +0200WzC(~Frank@77-162-168-71.fixed.kpn.net)
2023-10-26 19:06:35 +0200vglfr(~vglfr@88.155.140.136) (Read error: Connection reset by peer)
2023-10-26 19:06:46 +0200Noinia(~Frank@77-162-168-71.fixed.kpn.net) (Ping timeout: 255 seconds)
2023-10-26 19:07:59 +0200AlexZenon(~alzenon@178.34.162.116) (Ping timeout: 255 seconds)
2023-10-26 19:12:10 +0200 <srk> carbolymer: I think it would work using inputsFrom = [ pkgs.haskellPackages.haskellSandbox.env.buildInputs ]; but [Leary]s solution is better for sure
2023-10-26 19:17:07 +0200tiber__(~tiber@2a02:2f04:11e:c600:895a:e128:f425:deba) (Ping timeout: 264 seconds)
2023-10-26 19:18:57 +0200kilolympus(~kilolympu@31.205.200.235)
2023-10-26 19:20:50 +0200tromp(~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl) (Quit: My iMac has gone to sleep. ZZZzzz…)
2023-10-26 19:21:13 +0200 <carbolymer> srk: what's the advantage of shellFor?
2023-10-26 19:28:30 +0200 <dostoyevsky2> Beginner question: When you look at code like <<ParseSuccess r' s'' n' m' → ParseSuccess r' s'' (n + n') (furthest m (offset n . m'))>> -- how do you know what's a string? (This is from geordi's source code, #c++ eval bot)
2023-10-26 19:28:57 +0200AlexZenon(~alzenon@178.34.162.116)
2023-10-26 19:29:33 +0200 <EvanR> is that actual haskell
2023-10-26 19:29:54 +0200 <geekosaur> with UnicodeSyntax
2023-10-26 19:30:28 +0200 <EvanR> is it type level or term level
2023-10-26 19:30:36 +0200 <EvanR> I can't read it
2023-10-26 19:30:57 +0200 <carbolymer> is there a type level dot?
2023-10-26 19:30:57 +0200 <EvanR> I am skeptical of this being a beginner question
2023-10-26 19:31:10 +0200 <dostoyevsky2> EvanR: https://github.com/Eelis/geordi/tree/master <- github says it's Haskell 78.6%
2023-10-26 19:31:32 +0200 <ghoulguy> That looks like a case branch
2023-10-26 19:32:00 +0200 <EvanR> oh, is << and >> quotation marks in your language
2023-10-26 19:32:13 +0200 <geekosaur> yeh
2023-10-26 19:32:22 +0200 <geekosaur> «»
2023-10-26 19:33:22 +0200 <dostoyevsky2> EvanR: Normally I'd quote LaTeX-style `' but that's confusing if the code itself contains '
2023-10-26 19:33:23 +0200 <EvanR> dostoyevsky2, it's very helpful to look around for type signatures to help you identify what is what type
2023-10-26 19:34:17 +0200 <EvanR> hopefully they put type signatures
2023-10-26 19:34:41 +0200eggplantade(~Eggplanta@2600:1700:38c5:d800:7473:6047:87f6:c0b2) (Remote host closed the connection)
2023-10-26 19:34:52 +0200 <dostoyevsky2> > if before' == before then mzero else return $ before' ++ (if c == ']' then "" else " [with")
2023-10-26 19:34:53 +0200 <lambdabot> error: Variable not in scope: before'error: Variable not in scope: beforeerr...
2023-10-26 19:35:19 +0200 <dostoyevsky2> I can guess that before' is probably a derived variable and ']' is a char... but not sure what the actual syntax rules are here
2023-10-26 19:35:44 +0200 <EvanR> before' and before are variables, ']' is a Char literal
2023-10-26 19:36:20 +0200 <EvanR> that they are being compared for equality doesn't narrow down the types much
2023-10-26 19:36:52 +0200 <EvanR> > [3.14 == 7.3, 'a' == 'a', False == True]
2023-10-26 19:36:53 +0200 <lambdabot> [False,True,False]
2023-10-26 19:37:02 +0200 <mauke> before' is being concatenated with a String, which helps
2023-10-26 19:37:10 +0200 <dostoyevsky2> https://github.com/Eelis/geordi/blob/master/src/ErrorFilters.hs <- it mentions String a lot (since it's cleaning up gcc error messages) so I guess they are Strings
2023-10-26 19:37:13 +0200 <geekosaur> but the rest does; absent OverloadedTypes it looks like before' and therefore before are String
2023-10-26 19:37:42 +0200 <mauke> also, it's using ++ to do so, which nails down the type to [a] in any case
2023-10-26 19:37:57 +0200 <geekosaur> true
2023-10-26 19:39:13 +0200 <mauke> dostoyevsky2: in your original question, nothing is a string
2023-10-26 19:39:13 +0200 <EvanR> dostoyevsky2, 94 is where before is introduced, and comes from manyTill, which produces a list, anyChar is a parser which produces a Char, so you have [Char]. Which String is a synonym of
2023-10-26 19:39:21 +0200 <mauke> it's pretty generic code
2023-10-26 19:48:20 +0200tromp(~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl)
2023-10-26 19:51:26 +0200L29Ah(~L29Ah@wikipedia/L29Ah) ()
2023-10-26 19:51:52 +0200L29Ah(~L29Ah@wikipedia/L29Ah)
2023-10-26 19:57:53 +0200tabemann__(~tabemann@2600:1700:7990:24e0:a299:50e0:47de:b82a)
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2023-10-26 20:02:01 +0200Inst(~Inst@120.244.192.250)
2023-10-26 20:02:07 +0200 <Inst> what does ghc --info do?
2023-10-26 20:02:17 +0200 <Inst> https://downloads.haskell.org/ghc/latest/docs/users_guide/using.html#ghc-flag---info
2023-10-26 20:02:48 +0200 <geekosaur> dumps the settings with which ghc was built
2023-10-26 20:03:40 +0200falafel(~falafel@62.175.113.194.dyn.user.ono.com)
2023-10-26 20:05:04 +0200 <geekosaur> https://paste.tomsmeding.com/k0bDPZjI
2023-10-26 20:06:53 +0200 <srk> carbolymer: just a shorthand, you could even ditch shellFor or mkShell for mkDerivation like this https://github.com/HaskellEmbedded/ivory-tower-nix/blob/master/makeshell.nix
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2023-10-26 20:54:15 +0200 <ash3en> hi, me again: anyone got ld.lld errors when trying to compile for windows? error started to show up when i added aeson to my code. something about undefined symbol. on mac it helped to update to ghc 9.6.2, but no luck on windows with that..
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2023-10-26 21:45:56 +0200Square(~Square@user/square)
2023-10-26 21:50:19 +0200 <Inst> performance wise, what does having a phantom type do with regard to performance?
2023-10-26 21:50:58 +0200masterbuilder(~masterbui@user/masterbuilder) (Ping timeout: 260 seconds)
2023-10-26 21:51:32 +0200 <EvanR> nothing, types don't exist at runtime
2023-10-26 21:51:47 +0200 <monochrom> Bayesianly I could claim that 90% of phantom types don't add any cost because 90% of phantom types I've seen don't add any cost.
2023-10-26 21:52:30 +0200 <monochrom> But honestly you should just look at how a specific phantom type is actually defined, then it is obvious because you already know how "data" works and how "newtype" works.
2023-10-26 21:52:55 +0200 <Inst> i'm assuming phantom type parameters affect optimization
2023-10-26 21:52:56 +0200 <monochrom> Proxy is the other 10%.
2023-10-26 21:53:40 +0200 <EvanR> if proxy is costing something, it's not because of phantom types
2023-10-26 21:53:57 +0200sm(~sm@plaintextaccounting/sm)
2023-10-26 21:53:58 +0200 <EvanR> but because of type class and ad hoc polymorphism
2023-10-26 21:54:11 +0200 <EvanR> which is something at runtime
2023-10-26 21:54:16 +0200 <monochrom> Well, Proxy is the other 9%, :~: is the remaining 1%. Or something.
2023-10-26 21:55:05 +0200 <EvanR> Inst, care to elaborate
2023-10-26 21:55:45 +0200 <Inst> 斯塔特# 佛日instanceis泼了一抹热平衡ic, 日光和他?
2023-10-26 21:55:51 +0200 <Inst> State for instance is polymorphic, right?
2023-10-26 21:55:58 +0200eggplant_(~Eggplanta@104-55-37-220.lightspeed.sntcca.sbcglobal.net)
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2023-10-26 21:57:17 +0200 <Inst> State#, I mean
2023-10-26 21:57:26 +0200 <Inst> but it's all weird polymorphism tricks afaik
2023-10-26 21:58:21 +0200 <EvanR> newtypes don't exist at runtime, phantom type params or not
2023-10-26 21:58:56 +0200 <Inst> https://hackage.haskell.org/package/base-4.19.0.0/docs/GHC-Exts.html#t:State-35-
2023-10-26 21:59:20 +0200 <c_wraith> monochrom: I'm not sure I buy that the arguments to :~: are actually phantom, because the constructor *does* use them.
2023-10-26 21:59:28 +0200 <monochrom> Pretty sure this kind of qualitative reasoning gets you nowhere.
2023-10-26 21:59:34 +0200 <Inst> look at https://github.com/haskell/cabal/blame/master/Cabal/src/Distribution/GetOpt.hs
2023-10-26 22:00:00 +0200 <EvanR> what am I looking at
2023-10-26 22:00:01 +0200 <Inst> ArgOrder a, it had its polymorphic error type factored out
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2023-10-26 22:00:23 +0200 <Inst> so i'm surprised when that got factored out, no one thought to change it to ArgOrder instead of ArgOrder a, with a phantom
2023-10-26 22:00:38 +0200 <Inst> compare:
2023-10-26 22:00:39 +0200 <Inst> https://hackage.haskell.org/package/base-4.19.0.0/docs/src/System.Console.GetOpt.html#getOpt
2023-10-26 22:01:03 +0200 <monochrom> c_wraith: Fortunately under Bayesianism I have factored in an estimate of how many people consider it a phantom type in my total probability >:)
2023-10-26 22:01:47 +0200 <EvanR> removing the phantom from ArgOrder a only affects the type checking and that's it
2023-10-26 22:02:00 +0200pixelmonk(~pixelmonk@50.205.76.66)
2023-10-26 22:02:33 +0200 <EvanR> and then you can write more programs by mixing ArgOrders differently, affecting performance, I guess
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2023-10-26 23:35:22 +0200tromp(~textual@92-110-219-57.cable.dynamic.v4.ziggo.nl)
2023-10-26 23:36:34 +0200 <shapr> @quote tromp
2023-10-26 23:36:34 +0200 <lambdabot> tromp says: the number of legal 17x17 Go positions is 9895749638558742166 modulo 18446744073709551577 :)
2023-10-26 23:37:25 +0200 <tromp> @quote shapr
2023-10-26 23:37:25 +0200 <lambdabot> shapr says: I can has lambda now?
2023-10-26 23:37:29 +0200 <shapr> haha
2023-10-26 23:37:34 +0200 <shapr> howdy tromp, how's life?
2023-10-26 23:37:51 +0200 <tromp> jolly good, but missing the summer weather
2023-10-26 23:37:55 +0200 <shapr> yeah, same here
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