2025/05/18

2025-05-18 00:02:19 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 00:02:42 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 00:05:50 +0200machinedgod(~machinedg@d108-173-18-100.abhsia.telus.net) machinedgod
2025-05-18 00:06:37 +0200 <kaol> cabal v2 sucks. I want to edit one file and I can't figure how to do an incremental compile. It always worked just fine with v1. I seem to be stuck in a hell of waiting for 150 modules to build every time instead.
2025-05-18 00:08:02 +0200 <monochrom> I never experieinced that.
2025-05-18 00:08:20 +0200 <kaol> "cabal build > Up to date" no it isn't you idiot program.
2025-05-18 00:12:53 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) (Ping timeout: 272 seconds)
2025-05-18 00:16:36 +0200 <kaol> Okay, I switched from bumping the project version number in cabal to just twiddling with build-depends instead. That avoids doing the full compile at least. Now I just change base's upper bound every time to trigger the check to see that one module that's changed.
2025-05-18 00:16:51 +0200peterbecich(~Thunderbi@syn-047-229-123-186.res.spectrum.com) (Quit: peterbecich)
2025-05-18 00:17:12 +0200peterbecich(~Thunderbi@syn-047-229-123-186.res.spectrum.com) peterbecich
2025-05-18 00:18:12 +0200jmcantrell(~weechat@user/jmcantrell) jmcantrell
2025-05-18 00:18:30 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 00:18:53 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 00:20:43 +0200Frostillicus(~Frostilli@pool-71-174-119-56.bstnma.fios.verizon.net)
2025-05-18 00:24:39 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 00:25:00 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 00:25:30 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn
2025-05-18 00:26:17 +0200wootehfoot(~wootehfoo@user/wootehfoot) (Read error: Connection reset by peer)
2025-05-18 00:26:20 +0200 <hololeap> I've seen doctests change some obscure thing and cause a bunch of modules to get rebuilt
2025-05-18 00:28:42 +0200machinedgod(~machinedg@d108-173-18-100.abhsia.telus.net) (Ping timeout: 272 seconds)
2025-05-18 00:28:51 +0200 <kaol> And even that build-dependency trick is not quite clean. It triggers dependency checks for all of my executables and libraries, not just the one I'm editing. Those take time.
2025-05-18 00:29:58 +0200 <kaol> And all I'm really doing is just cabal build. This is the kind of usability issues that make me think that cabal developers never use the program themselves.
2025-05-18 00:30:33 +0200 <EvanR> you're changing the version numbers on base but don't want it to recompile everything?
2025-05-18 00:30:53 +0200 <kaol> I'm only doing it to have it notice a change to one module file.
2025-05-18 00:31:04 +0200tromp(~textual@2001:1c00:3487:1b00:ace7:b293:8f4:7479) (Quit: My iMac has gone to sleep. ZZZzzz…)
2025-05-18 00:31:10 +0200 <kaol> The upper bound. I'm not obviously changing ghc in between.
2025-05-18 00:31:21 +0200 <EvanR> changing 1 module file shouldn't trigger a full rebuild, unless it's something everything depends on
2025-05-18 00:31:40 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 00:31:46 +0200 <kaol> Changing 1 module file gets completely ignored. That's the problem.
2025-05-18 00:31:55 +0200 <EvanR> o_O
2025-05-18 00:31:59 +0200 <kaol> I'm manipulating my cabal file just to make cabal build catch that.
2025-05-18 00:32:03 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 00:32:28 +0200 <EvanR> are you sure that file is listed in the cabal other modules
2025-05-18 00:32:30 +0200notzmv(~daniel@user/notzmv) (Ping timeout: 272 seconds)
2025-05-18 00:34:39 +0200 <Clint> as opposed to exposed-modules?
2025-05-18 00:34:41 +0200 <kaol> It makes no difference whether I have it in other-modules or not.
2025-05-18 00:34:55 +0200 <kaol> v1 never cared about that.
2025-05-18 00:35:41 +0200 <monochrom> I guess with 150 modules, one is not inclined to list them anywhere.
2025-05-18 00:36:19 +0200 <kaol> I just want the behavior that cabal build does if I have a compile error in one module. It works as expected as long as I don't have it compile successfully.
2025-05-18 00:36:38 +0200 <kaol> As long as it is in that state I can change any module and it sees the change.
2025-05-18 00:36:53 +0200 <kaol> But once it compiles once, it never checks any files for changes again.
2025-05-18 00:36:58 +0200 <kaol> Unless I edit my cabal file.
2025-05-18 00:37:19 +0200 <kaol> Which triggers all sorts of dependency checks as well which is slow.
2025-05-18 00:38:32 +0200 <kaol> If cabal build is not the supposed way to use cabal then what is?
2025-05-18 00:38:41 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 00:38:45 +0200 <kaol> If I can't even build my project anymore after it succeeds once?
2025-05-18 00:39:05 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 00:40:14 +0200Frostillicus(~Frostilli@pool-71-174-119-56.bstnma.fios.verizon.net) (Ping timeout: 260 seconds)
2025-05-18 00:46:07 +0200 <sm> kaol, that's not working as intended. It'll take some work, but maybe you can minimise it to identify the cause, or share the repo
2025-05-18 00:46:25 +0200__monty__(~toonn@user/toonn) (Quit: leaving)
2025-05-18 00:47:31 +0200 <sm> there's also the #hackage channel where cabal developers are
2025-05-18 00:49:09 +0200notzmv(~daniel@user/notzmv) notzmv
2025-05-18 00:49:47 +0200 <sm> also mention your cabal --version
2025-05-18 00:50:30 +0200Guest11(~Guest11@syn-024-165-041-231.res.spectrum.com)
2025-05-18 00:52:13 +0200 <kaol> https://gitlab.com/piperka/piperka and cabal-install version 3.10.3.0
2025-05-18 00:55:55 +0200Frostillicus(~Frostilli@pool-71-174-119-56.bstnma.fios.verizon.net)
2025-05-18 00:56:25 +0200 <sm> kaol, this project doesn't build easily, I wonder which ghc --version you have
2025-05-18 00:56:46 +0200 <sm> 9.6 I guess
2025-05-18 00:58:07 +0200 <sm> no good.. I would try to reproduce your issue, but I can't resolve your dependencies
2025-05-18 00:58:35 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 00:58:56 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 00:59:08 +0200 <kaol> I'm using 9.6.6 currently.
2025-05-18 01:00:49 +0200Frostillicus(~Frostilli@pool-71-174-119-56.bstnma.fios.verizon.net) (Ping timeout: 252 seconds)
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2025-05-18 01:09:05 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 01:10:12 +0200 <sm> --allow-newer gets farther, but I failed to make cabal build text-icu on mac. But try simplifying your project until it works. Changing a .hs file should definitely trigger recompilation
2025-05-18 01:11:20 +0200Guest11(~Guest11@syn-024-165-041-231.res.spectrum.com)
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2025-05-18 01:21:00 +0200Lord_of_Life_(~Lord@user/lord-of-life/x-2819915) Lord_of_Life
2025-05-18 01:21:39 +0200Lord_of_Life(~Lord@user/lord-of-life/x-2819915) (Ping timeout: 244 seconds)
2025-05-18 01:21:48 +0200bitdex(~bitdex@gateway/tor-sasl/bitdex) (Ping timeout: 264 seconds)
2025-05-18 01:22:22 +0200Lord_of_Life_Lord_of_Life
2025-05-18 01:22:59 +0200 <kaol> "cabal install --only-dependencies --force-reinstalls --overwrite-policy=always" works as well to clear whatever's blocking the module file change check.
2025-05-18 01:23:44 +0200bitdex(~bitdex@gateway/tor-sasl/bitdex) bitdex
2025-05-18 01:25:04 +0200 <kaol> No wait, that didn't. I still needed to edit my cabal file.
2025-05-18 01:29:50 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) (Ping timeout: 268 seconds)
2025-05-18 01:36:36 +0200 <Leary> kaol: Your `hs-source-dirs` are overlapping between components. This can cause problems due to the way GHC searches for modules; try separating them.
2025-05-18 01:38:45 +0200 <sm> 🚀
2025-05-18 01:39:42 +0200 <Leary> (I'm not claiming this is the solution, but it's the thing that looks most wrong in the .cabal file)
2025-05-18 01:41:44 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn
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2025-05-18 01:44:43 +0200ljdarj1(~Thunderbi@user/ljdarj) ljdarj
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2025-05-18 02:55:37 +0200Square2(~Square@user/square) (Ping timeout: 265 seconds)
2025-05-18 02:59:48 +0200 <sm> watch = ["util", "exec", "--", "sh", "-c", """
2025-05-18 02:59:49 +0200 <sm> watchexec --wrap-process=session --no-vcs-ignore --ignore .jj/working_copy/working_copy.lock -c clear --bell "date; echo; jj --no-pager $@"
2025-05-18 02:59:49 +0200 <sm> """, ""]
2025-05-18 03:01:49 +0200end(~end@user/end/x-0094621) (Ping timeout: 252 seconds)
2025-05-18 03:02:10 +0200bcksl(~bcksl@user/bcksl) (Ping timeout: 260 seconds)
2025-05-18 03:02:47 +0200sus0(zero@user/zeromomentum) (Ping timeout: 252 seconds)
2025-05-18 03:05:41 +0200 <sm> I forgot a `--watch .jj` in there, more efficient
2025-05-18 03:06:05 +0200 <sm> now I can have an updating log, op log etc like in Martin's video
2025-05-18 03:09:59 +0200 <sm> and I can keep an eye on what other jj tools (like VJJ) are doing
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2025-05-18 03:11:11 +0200peterbecich(~Thunderbi@syn-047-229-123-186.res.spectrum.com) peterbecich
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2025-05-18 03:35:21 +0200end(~end@user/end/x-0094621) end^
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2025-05-18 04:16:02 +0200td_(~td@i5387091A.versanet.de) td_
2025-05-18 04:16:14 +0200 <ski> oh .. sorry, for some reason i missed the paste, Leary
2025-05-18 04:19:19 +0200 <Leary> No worries.
2025-05-18 04:24:02 +0200JuanDaugherty(~juan@user/JuanDaugherty) JuanDaugherty
2025-05-18 04:25:11 +0200gmg(~user@user/gehmehgeh) (Remote host closed the connection)
2025-05-18 04:29:14 +0200 <ski> i was reminded of `IVar's, but it doesn't look like what you're doing is that similar to that (except `Identified', slightly)
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2025-05-18 06:17:52 +0200haskellbridge(~hackager@syn-096-028-224-255.res.spectrum.com) hackager
2025-05-18 06:17:52 +0200ChanServ+v haskellbridge
2025-05-18 06:21:53 +0200j1n37(~j1n37@user/j1n37) j1n37
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2025-05-18 06:24:12 +0200ChanServ+v haskellbridge
2025-05-18 06:25:32 +0200 <geekosaur> network back, IP address changed so matrix-side may be a little flaky until the new one propagates
2025-05-18 06:28:53 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn
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2025-05-18 06:45:24 +0200Nosrep(~Nosrep@user/nosrep) (Ping timeout: 245 seconds)
2025-05-18 06:48:59 +0200 <sm> hurrah!
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2025-05-18 06:52:23 +0200Lord_of_Life(~Lord@user/lord-of-life/x-2819915) Lord_of_Life
2025-05-18 06:55:25 +0200Frostillicus(~Frostilli@71.174.119.69)
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2025-05-18 07:00:10 +0200Frostillicus(~Frostilli@71.174.119.69) (Ping timeout: 260 seconds)
2025-05-18 07:01:05 +0200jmcantrell(~weechat@user/jmcantrell) (Quit: WeeChat 4.6.2)
2025-05-18 07:07:18 +0200joeyadams(~textual@syn-162-154-010-038.res.spectrum.com) (Quit: Textual IRC Client: www.textualapp.com)
2025-05-18 07:07:43 +0200robobub(uid248673@id-248673.uxbridge.irccloud.com) robobub
2025-05-18 07:14:40 +0200 <haskellbridge> <magic_rb> i seem to recall some people hosted these temporary file sharing services and those would work, they all skipped my mind though just now
2025-05-18 07:14:42 +0200 <haskellbridge> <sm> matrix ?
2025-05-18 07:14:42 +0200 <haskellbridge> <sm> or https://pub.microbin.eu ?
2025-05-18 07:14:42 +0200 <haskellbridge> <magic_rb> https://pub.microbin.eu/upload/zebra-eagle this works
2025-05-18 07:14:42 +0200 <haskellbridge> <sm> excellent pastebin
2025-05-18 07:14:42 +0200 <haskellbridge> <magic_rb> dmjio i was talking about the photo thing right, so that is how it looks now
2025-05-18 07:14:42 +0200 <haskellbridge> <magic_rb> you can tag photos, rename them, javascript free
2025-05-18 07:14:44 +0200 <haskellbridge> <magic_rb> and its stored in git+git-annex
2025-05-18 07:14:45 +0200 <haskellbridge> <magic_rb> https://paste.tomsmeding.com/fxesVbzl like that
2025-05-18 07:14:47 +0200 <haskellbridge> <magic_rb> the database is just a cache for the toml files and can be evicted at any point
2025-05-18 07:14:48 +0200 <haskellbridge> <sm> test
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2025-05-18 09:37:15 +0200Digit(~user@user/digit) Digit
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2025-05-18 09:44:54 +0200acidjnk(~acidjnk@p200300d6e71c4f033d258f2e8b70eea4.dip0.t-ipconnect.de) acidjnk
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2025-05-18 10:00:25 +0200sus0(zero@user/zeromomentum) zeromomentum
2025-05-18 10:02:29 +0200Tuplanolla(~Tuplanoll@91-159-69-59.elisa-laajakaista.fi) Tuplanolla
2025-05-18 10:03:59 +0200 <haskellbridge> <sm> what's Haskell's killer domain, for https://news.ycombinator.com/item?id=44018922 ?
2025-05-18 10:05:40 +0200Digit(~user@user/digit) (Ping timeout: 260 seconds)
2025-05-18 10:05:58 +0200 <haskellbridge> <sm> "high-assurance computing and prototyping/research"
2025-05-18 10:06:28 +0200 <Rembane> Also parsers and compilers
2025-05-18 10:06:32 +0200 <haskellbridge> <hellwolf> ecosystem of PL nerds
2025-05-18 10:06:57 +0200 <Rembane> And research in lazily evaluated programming languages
2025-05-18 10:09:37 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 10:09:59 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
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2025-05-18 10:18:17 +0200 <haskellbridge> <maerwald> High assurance computing?
2025-05-18 10:18:41 +0200 <haskellbridge> <maerwald> GHC and its RTS are underspecified black boxes
2025-05-18 10:19:39 +0200 <haskellbridge> <sm> better: "High assurance applications and prototyping/research"
2025-05-18 10:20:33 +0200 <haskellbridge> <sm> this is in context of the above article, where each language gets 4-6 words for a general audience
2025-05-18 10:21:37 +0200tromp(~textual@2001:1c00:3487:1b00:ace7:b293:8f4:7479) (Quit: My iMac has gone to sleep. ZZZzzz…)
2025-05-18 10:21:42 +0200 <haskellbridge> <sm> * 1-6
2025-05-18 10:23:53 +0200__monty__(~toonn@user/toonn) toonn
2025-05-18 10:26:51 +0200ljdarj(~Thunderbi@user/ljdarj) ljdarj
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2025-05-18 10:42:57 +0200JuanDaugherty(~juan@user/JuanDaugherty) JuanDaugherty
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2025-05-18 11:17:45 +0200JuanDaugherty(~juan@user/JuanDaugherty) (Quit: praxis.meansofproduction.biz (juan@acm.org))
2025-05-18 11:19:54 +0200j1n37(~j1n37@user/j1n37) j1n37
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2025-05-18 11:39:49 +0200Frostillicus(~Frostilli@pool-71-174-119-69.bstnma.fios.verizon.net)
2025-05-18 11:40:19 +0200lxsameer(~lxsameer@Serene/lxsameer) lxsameer
2025-05-18 11:44:11 +0200 <lxsameer> hey folks, how do you model a data type with one constructor, in such a way that every value of that type is a distinct value, so no two value are equal? the constructor does not take any input. it's literally `data X = X`
2025-05-18 11:45:38 +0200 <lxsameer> for example, in an implementation of this type in an imperative lang, they just left it to the memory manager to choose a distinct address for each new value
2025-05-18 11:45:50 +0200 <lxsameer> and compare elements of this type based on their address
2025-05-18 11:47:00 +0200 <tomsmeding> lxsameer: give it an Int field, don't export the constructor, and expose a smart constructor that increments a global IORef?
2025-05-18 11:47:14 +0200 <tomsmeding> obligatory warning: use atomicModifyIORef', and put NOINLINE on functions with unsafePerformIO
2025-05-18 11:47:19 +0200Sgeo(~Sgeo@user/sgeo) (Read error: Connection reset by peer)
2025-05-18 11:47:47 +0200 <lxsameer> tomsmeding: thank you
2025-05-18 11:48:42 +0200j1n37-(~j1n37@user/j1n37) j1n37
2025-05-18 11:48:58 +0200econo_(uid147250@id-147250.tinside.irccloud.com) (Quit: Connection closed for inactivity)
2025-05-18 11:49:24 +0200j1n37(~j1n37@user/j1n37) (Ping timeout: 244 seconds)
2025-05-18 11:50:09 +0200Frostillicus(~Frostilli@pool-71-174-119-69.bstnma.fios.verizon.net) (Ping timeout: 248 seconds)
2025-05-18 11:50:37 +0200 <mauke> instance Eq X where _ == _ = False
2025-05-18 11:53:38 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 11:54:02 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 11:55:56 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) (Ping timeout: 252 seconds)
2025-05-18 12:02:30 +0200 <lxsameer> mauke: a value is still equal to itself
2025-05-18 12:04:11 +0200 <mauke> equal in what sense?
2025-05-18 12:04:34 +0200 <lxsameer> sameness
2025-05-18 12:09:22 +0200 <mauke> what does that mean
2025-05-18 12:10:01 +0200 <lxsameer> a = X; b = X; c = a; a /= b; a == c
2025-05-18 12:10:04 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn
2025-05-18 12:13:27 +0200 <mauke> oh, you *want* it to be equal
2025-05-18 12:13:43 +0200 <mauke> yeah, that's not a thing
2025-05-18 12:15:40 +0200turlando(~turlando@user/turlando) (Quit: No Ping reply in 180 seconds.)
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2025-05-18 12:16:56 +0200turlando(~turlando@user/turlando) turlando
2025-05-18 12:20:38 +0200notzmv(~daniel@user/notzmv) (Ping timeout: 265 seconds)
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2025-05-18 12:35:01 +0200ChaiTRex(~ChaiTRex@user/chaitrex) ChaiTRex
2025-05-18 12:35:23 +0200 <tomsmeding> the fact that you need ugliness like unsafePerformIO in my suggestion shows what you're asking for :p
2025-05-18 12:35:39 +0200 <lxsameer> ah haskell has a Unique type too
2025-05-18 12:35:46 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 12:36:08 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 12:36:13 +0200 <lxsameer> essentially it seems like the same thing that tomsmeding suggested
2025-05-18 12:36:28 +0200 <tomsmeding> yes, but you still need to write the unsafePerformIO yourself
2025-05-18 12:36:51 +0200 <tomsmeding> well here is indeed precisely what I suggested, lol https://hackage.haskell.org/package/ghc-internal-9.1201.0/docs/src/GHC.Internal.Data.Unique.html#U…
2025-05-18 12:37:04 +0200 <tomsmeding> except you probably need another unsafePerformIO around newUnique
2025-05-18 12:38:18 +0200 <tomsmeding> the comments below newUnique are interesting to read: apparently it was an MVar before, then it became STM, and then it became an IORef
2025-05-18 12:38:55 +0200 <tomsmeding> given current state of things in GHC Haskell, I would never even consider using something else than an IORef, but because these things harken from >12 years ago, perhaps the runtime behaved differently
2025-05-18 12:40:12 +0200wootehfoot(~wootehfoo@user/wootehfoot) (Ping timeout: 272 seconds)
2025-05-18 12:40:45 +0200 <Rembane> So things became less and less safe and faster and faster over time?
2025-05-18 12:40:56 +0200euleritian(~euleritia@ip4d17f864.dynamic.kabel-deutschland.de) (Ping timeout: 265 seconds)
2025-05-18 12:41:22 +0200euleritian(~euleritia@dynamic-176-006-136-230.176.6.pool.telefonica.de)
2025-05-18 12:44:18 +0200 <lxsameer> hmmmm but i think it's better to rethink the approach
2025-05-18 12:44:31 +0200wootehfoot(~wootehfoo@user/wootehfoot) wootehfoot
2025-05-18 12:46:08 +0200tromp(~textual@2001:1c00:3487:1b00:ace7:b293:8f4:7479) (Quit: My iMac has gone to sleep. ZZZzzz…)
2025-05-18 12:46:37 +0200euleritian(~euleritia@dynamic-176-006-136-230.176.6.pool.telefonica.de) (Read error: Connection reset by peer)
2025-05-18 12:46:55 +0200euleritian(~euleritia@ip4d17f864.dynamic.kabel-deutschland.de)
2025-05-18 12:48:43 +0200 <tomsmeding> Rembane: why less safe?
2025-05-18 12:49:27 +0200 <tomsmeding> the move from MVar to STM lost fairness; I would not call that "safety", but it's perhaps close enough. But STM -> IORef doesn't lose anything
2025-05-18 12:49:38 +0200 <Rembane> tomsmeding: Maybe I have misunderstood everything but I thought MVar was more safe than STM that was more safe than IORef, but I don't know why. So it might just be something I got wrong.
2025-05-18 12:49:41 +0200 <tomsmeding> (in this particular application)
2025-05-18 12:49:47 +0200 <Rembane> Got it!
2025-05-18 12:49:53 +0200 <lxsameer> tomsmeding: no, I'm trying to port a legacy code (which is in very old scheme) to haskell, what is happening there is not necessarily the right way to implement it in haskell
2025-05-18 12:50:08 +0200 <lxsameer> ah sorry, it wasn't for me
2025-05-18 12:50:41 +0200 <tomsmeding> Rembane: MVar is a mutable variable with guaranteed FIFO queueing; STM is optimistic concurrency that has various sources of overhead but avoids locking in the happy path of no contention
2025-05-18 12:50:43 +0200LainIwakura(~LainIwaku@user/LainIwakura) LainIwakura
2025-05-18 12:50:58 +0200 <tomsmeding> STM doesn't give any concurrency guarantees, just the observation that in practice it works really well
2025-05-18 12:51:07 +0200 <tomsmeding> IORef is just... a mutable thing
2025-05-18 12:51:22 +0200 <Rembane> tomsmeding: Maybe that's the point. Hm... because I've learned them in the context of concurrency.
2025-05-18 12:51:24 +0200 <tomsmeding> it seems to me that "obviously" atomicModifyIORef' is the fastest
2025-05-18 12:51:37 +0200 <tomsmeding> it does just an atomic update, whereas MVar and STM do a whole lot more
2025-05-18 12:51:45 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr) (Remote host closed the connection)
2025-05-18 12:52:07 +0200sabathan2(~sabathan@amarseille-159-1-12-107.w86-203.abo.wanadoo.fr)
2025-05-18 12:52:20 +0200 <tomsmeding> lxsameer: I'm not saying you're doing the wrong thing, just indicating that what you're doing isn't very haskell-like, and the language complains by making you do ugly things. :)
2025-05-18 12:52:54 +0200tomsmedingworks almost daily with programs that use this particular ID generation trick, so I'm tainted too
2025-05-18 12:52:55 +0200 <lxsameer> tomsmeding: that's a good summary of it
2025-05-18 12:54:14 +0200 <tomsmeding> Rembane: I learned them in the context of concurrency too! Specifically, in the context of having to teach concurrency to bachelor students in a course that uses haskell :p
2025-05-18 12:54:26 +0200 <tomsmeding> (I knew them decently well before that, but more in detail now)
2025-05-18 12:54:43 +0200fp1(~Thunderbi@hof1.kyla.fi) fp
2025-05-18 12:55:01 +0200 <Rembane> tomsmeding: That's a really good trick to learn something! :D
2025-05-18 12:55:07 +0200 <tomsmeding> it is :)
2025-05-18 12:55:14 +0200 <tomsmeding> just a bit hard to pull off, sometimes