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Logs: liberachat/#haskell

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2021-05-31 00:22:52 → sajith joins (~sajith@user/sajith)
2021-05-31 00:22:55 × fizbin quits (~fizbin@c-73-33-197-160.hsd1.nj.comcast.net) (Remote host closed the connection)
2021-05-31 00:24:01 <chisui> Is there a good writeup of what actually went down? I only read bits and peaces.
2021-05-31 00:24:43 <sm[m]> chisui: search for freenode in recent hacker news stories
2021-05-31 00:24:56 <pavonia> chisui: https://gist.github.com/joepie91/df80d8d36cd9d1bde46ba018af497409 though this doesn't include the "offcial" view
2021-05-31 00:29:19 <chisui> Thanks. What a clusterfuck
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2021-05-31 00:52:13 → arson joins (~arson@pool-100-36-47-118.washdc.fios.verizon.net)
2021-05-31 00:53:01 <arson> hello everyone :) first time on irc - would this be a place to ask some questions about if a function I have is similar or related in any way to something that already exists?
2021-05-31 00:54:23 <pavonia> Welcome! If it is about a Haskell function, sure
2021-05-31 00:55:58 × shapr quits (~user@2607:fb90:a90e:1723:c496:c7fd:8ebe:11ee) (Ping timeout: 268 seconds)
2021-05-31 00:59:08 → hmmmas joins (~chenqisu1@183.217.202.217)
2021-05-31 01:00:04 <arson> Thanks! I have this function, called `tw` for treewalk, which has the basic behavior of allowing you to recurse down a tree (such as an AST), but the caller also passes a function which looks at every node in the tree and can either have `tw` continue processing it, or do it's own processing and return a new node to use in place. This is further
2021-05-31 01:00:05 <arson> complicated by the fact that the function tw takes in, takes in a callback which is equal to `tw <the function argument>`, to allow for further recursion once it's made it's own new node. I know that makes zero sense, so there's two examples of how you would use the `tw` function at the bottom for manipulating ASTs. For sake of example I have a
2021-05-31 01:00:05 <arson> couple different ways of implementing this function. code: https://paste.tomsmeding.com/tYODlusU
2021-05-31 01:00:34 <arson> I'm looking for information about a similar function or concept, or even just a similar typeclass to `TWable` that's used in some way already.
2021-05-31 01:02:23 × ubikium quits (~ubikium@113x43x248x70.ap113.ftth.arteria-hikari.net) (Read error: Connection reset by peer)
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2021-05-31 01:06:39 <davean> arson: Look at recursion schemes
2021-05-31 01:07:03 × wagle quits (~wagle@quassel.wagle.io) (Ping timeout: 272 seconds)
2021-05-31 01:07:14 <pavonia> It somewhat reminds me of what the uniplate package does
2021-05-31 01:07:24 <davean> I mean it should because uniplate is based on ...
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2021-05-31 01:09:05 <pavonia> Based on what?
2021-05-31 01:09:43 × fosskers quits (~colin@S0106f0f249642f53.vn.shawcable.net) (Remote host closed the connection)
2021-05-31 01:09:47 <arson> funny how uniplate also has simple asts as their main example
2021-05-31 01:12:37 <davean> pavonia: the thing I'd said
2021-05-31 01:13:03 <davean> https://github.com/passy/awesome-recursion-schemes for a bunch of links
2021-05-31 01:13:30 → wagle joins (~wagle@quassel.wagle.io)
2021-05-31 01:14:17 <arson> heh, guess it's not haskell if you don't `{-# LANGUAGE DeriveFunctor, DeriveFoldable, DeriveTraversable, TemplateHaskell, TypeFamilies #-}`
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2021-05-31 01:16:04 <pavonia> Hhm, I'd say the whole language is more or less based on recursion schemes :p
2021-05-31 01:16:28 <davean> That seems an odd way to think about it, but you do you
2021-05-31 01:19:16 <davean> Yah, pretty sure i can't even stretch that to be true
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2021-05-31 02:12:09 → gbd_628 joins (~gbd_628@c-73-160-244-80.hsd1.nj.comcast.net)
2021-05-31 02:15:50 <gbd_628> Hi all, I'm getting an odd error when I try to build the latest version of `glib` from Hackage: "Lexical error! The character '#' does not fit here." Full error message: https://paste.tomsmeding.com/EcjZdm60.
2021-05-31 02:16:06 <gbd_628> I get the same problem with the `cairo` package. Googling led to the recommendation that I try compiling with LANG=C in the shell environment, but that didn't change anything for me.
2021-05-31 02:16:46 <gbd_628> (Sorry if this isn't really a Haskell question, but I'm not sure what's causing the problem so I don't know where else to ask)
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2021-05-31 02:17:30 <davean> With no particular knowlege I'd bet thats something like a c2hs issue
2021-05-31 02:17:40 <davean> check if your c2hs is old maybe?
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2021-05-31 02:19:50 × machinedgod quits (~machinedg@24.105.81.50) (Ping timeout: 268 seconds)
2021-05-31 02:21:33 <gbd_628> Sorry, what's c2hs? I have a program called `hsc2hs` as part of my ghc distribution; is that the same thing? It's on version 0.68.7
2021-05-31 02:22:38 <gbd_628> Which is the most recent version of it on hackage. I don't have any program called c2hs as part of my haskell installation, it doesn't look liek
2021-05-31 02:23:30 × chisui quits (~chisui@200116b86647790081989979d16794a1.dip.versatel-1u1.de) (Ping timeout: 250 seconds)
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2021-05-31 02:29:56 <geekosaur> that's a c2hs error but the real problem is too new a gcc
2021-05-31 02:30:56 <geekosaur> https://github.com/haskell/c2hs/issues/268
2021-05-31 02:32:41 <geekosaur> and the gtk stuff comes with its own fork of c2hs (gtk2hsc2hs) which it uses to build API descriptions from gtk/glib include files
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2021-05-31 02:35:22 <gbd_628> Hmm, okay, I'll downgrade to version 10.x of gcc, hopefully that'll work. Thanks!
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2021-05-31 02:49:37 <Axman6> davean: That recursion schemes link... the first link got me
2021-05-31 02:49:45 → sheepduck joins (~sheepduck@2607:fea8:2a60:b700::5d55)
2021-05-31 02:50:18 <davean> Axman6: :) stuck in a loop?
2021-05-31 02:51:08 <Axman6> I cannot get out D:
2021-05-31 02:51:20 <Axman6> I just keep learning about recursion schemes!
2021-05-31 02:52:04 <int-e> to learn about recursion schemes you first have to lear about recusion schemes?
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