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Logs: liberachat/#haskell

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2021-06-19 00:03:18 × ddellacosta quits (~ddellacos@86.106.121.100) (Ping timeout: 264 seconds)
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2021-06-19 00:04:07 <boxscape> yes it's neat :) though you need newtypes to satisfy haskell's type system and avoid infinite types
2021-06-19 00:04:20 <boxscape> if you actually want to use it that way
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2021-06-19 01:18:15 × ddellacosta quits (~ddellacos@86.106.121.100) (Ping timeout: 272 seconds)
2021-06-19 01:22:37 × boxscape quits (~boxscape@user/boxscape) (Ping timeout: 268 seconds)
2021-06-19 01:31:01 <sclv> slightly lazy question -- how do I check if a port is open to be _potentially_ bound to without actually binding to it?
2021-06-19 01:31:36 <sclv> I'm setting up some stuff wrapping ssh tunneling and want the nicest way to probe if I can pick a port to tunnel thru for subsequent commands...
2021-06-19 01:31:51 <geekosaur> I think the best you can do is parse netstat or lsof output
2021-06-19 01:32:07 <sclv> uggghhhhh
2021-06-19 01:32:08 <geekosaur> there's no way to ask if a port is available because that's a race condition waiting to happen
2021-06-19 01:32:17 <sclv> yeah its a race condition and i want to do it anyway lol
2021-06-19 01:32:43 <sclv> i guess i can just try to do the binding and then parse the failure message if there is one to decide if i want to retry or not :-/
2021-06-19 01:33:14 <sclv> like as long as we're just parsing stuff that cli utilities spit out at you
2021-06-19 01:34:23 <sclv> also could bind to it, then release again i guess...
2021-06-19 01:34:56 <geekosaur> the usual trick is to pick a port for a service you aren't running locally
2021-06-19 01:35:21 × willbush quits (~user@47.183.200.14) (Quit: ERC (IRC client for Emacs 28.0.50))
2021-06-19 01:38:02 × xff0x quits (~xff0x@port-92-193-217-187.dynamic.as20676.net) (Ping timeout: 268 seconds)
2021-06-19 01:38:24 <dsal> sclv: can you just tell it to bind to 0 and ask what it got?
2021-06-19 01:38:52 <geekosaur> no, this is about ssh tunneling, you have to specify
2021-06-19 01:38:53 <sclv> oh, nice, not a bad idea!
2021-06-19 01:39:02 <sclv> that works though, lol
2021-06-19 01:39:13 <geekosaur> if it were C you'd bind to 0 and ask it
2021-06-19 01:39:13 <sclv> I can bind to 0, see what it gets, then release and just use it
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2021-06-19 01:39:26 <sclv> i mean its a race condition, but one i can live with
2021-06-19 01:39:33 × derelict quits (~derelict@user/derelict) (Ping timeout: 244 seconds)
2021-06-19 01:40:13 <sclv> (btw the lack of a psshx lib for haskell is a bit of a PITA, but merijn 's posix-pty makes this whole thing livable at least)
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2021-06-19 01:40:26 <geekosaur> hope ssh uses SO_REUSEPORT
2021-06-19 01:41:14 <sclv> geekosaur: can't i just release the port I get from binding to 0?
2021-06-19 01:41:27 <sclv> and then try to use it, knowing it was guaranteed free at least recently?
2021-06-19 01:41:29 <geekosaur> no, because of TIME_WAIT to wait for any delayed packets
2021-06-19 01:41:37 <sclv> oh right, damb
2021-06-19 01:41:42 <sclv> networks suck
2021-06-19 01:41:44 × merijn quits (~merijn@83-160-49-249.ip.xs4all.nl) (Ping timeout: 268 seconds)
2021-06-19 01:41:53 <Melvar> Does anyone know if and where I could submit an issue regarding the GHC manual?
2021-06-19 01:42:00 <sclv> and uh, i should remember this, since i work on network parsing software lol
2021-06-19 01:42:15 <geekosaur> Melvar, there's a documentation topic in ghc's gitlab
2021-06-19 01:44:10 <geekosaur> more precisely a documentation label in their issue tracker
2021-06-19 01:44:22 <geekosaur> https://gitlab.haskell.org/ghc/ghc/-/issues
2021-06-19 01:44:28 <Melvar> Thank you.
2021-06-19 01:46:41 <Boarders> when GHC makes a suggestion for a name in scope close to the one you have provided in its error reporting e.g. if you write like lenght instead of length then does anyone know what algorithm GHC uses for that?
2021-06-19 01:46:55 <qrpnxz> how come 4.14 traversable (https://hackage.haskell.org/package/base-4.14.1.0/docs/Data-Traversable.html) has a bunch of laws, but 4.15 traversable (https://hackage.haskell.org/package/base-4.15.0.0/docs/Data-Traversable.html) doesn't?
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2021-06-19 01:47:18 × NieDzejkob quits (~quassel@195.149.98.3) (Ping timeout: 244 seconds)
2021-06-19 01:51:06 × ddellacosta quits (~ddellacos@86.106.121.100) (Ping timeout: 240 seconds)
2021-06-19 01:51:49 <geekosaur> qrpnxz, it instead contains a reference to https://hackage.haskell.org/package/base-4.15.0.0/docs/Data-Traversable.html#overview which has a "Laws" section
2021-06-19 01:52:43 <geekosaur> which, since it has the same base url, is just a rearrangement of the page
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2021-06-19 01:57:52 <sclv> Boarders: https://github.com/ghc/ghc/blob/25977ab542a30df4ae71d9699d015bcdd1ab7cfb/compiler/GHC/Utils/Misc.hs#L989
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2021-06-19 02:03:52 <Boarders> thanks!
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2021-06-19 02:17:34 <qrpnxz> lol i scroll over that page and i miss laws right there thanks
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2021-06-19 02:17:59 <qrpnxz> btw, how come it has to be a foldable
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2021-06-19 02:26:26 <qrpnxz> ah you can show all traversable are foldable ok
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