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2025-05-21 00:44:15 +0200 <EvanR> LAC-Tech, there's imprecise exceptions
2025-05-21 00:45:04 +0200 <EvanR> so technically unknown "pure code" containing no unsafePerformIO is not guaranteed to be deterministic
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2025-05-21 00:47:11 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn
2025-05-21 00:48:50 +0200 <haskellbridge> <sm> we’re talking about asynchronous exceptions, right ?
2025-05-21 00:49:11 +0200 <EvanR> no
2025-05-21 00:49:29 +0200 <EvanR> like error "foo" + error "bar"
2025-05-21 00:50:10 +0200 <geekosaur> if the compiler can determine that multiple paths all lead to bottoms, it can arbitrarily pick one
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2025-05-21 01:02:58 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) merijn
2025-05-21 01:04:26 +0200 <haskellbridge> <hellwolf> why is things like whenM not in base? I see that ghc and extra packages have them.
2025-05-21 01:05:15 +0200 <haskellbridge> <hellwolf> I am exploring the design space of caving into monadic bang vs. having these specialized fooM functions.
2025-05-21 01:05:40 +0200 <haskellbridge> <hellwolf> hence the question
2025-05-21 01:07:39 +0200 <c_wraith> Usually something like traverse_ is better anyway.
2025-05-21 01:07:40 +0200merijn(~merijn@host-vr.cgnat-g.v4.dfn.nl) (Ping timeout: 252 seconds)
2025-05-21 01:07:44 +0200 <EvanR> normal language: bool does a lot of heavy lifting, in haskell I feel like it got relegated to tier 4 control technology. Because you pattern match on more meaningful things most of time
2025-05-21 01:07:45 +0200tolgo(~Thunderbi@199.115.144.130)
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2025-05-21 01:08:34 +0200 <c_wraith> and that's because you generally try to avoid Bool, yeah
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2025-05-21 01:10:13 +0200 <LAC-Tech> EvanR: interesting. General impression I'm getting is "it's mostly solved by the IO boundaries but there's a few annoying edge cases"
2025-05-21 01:11:07 +0200 <EvanR> haskell is like the jumping off point to new languages with more guarantees rather than the destination
2025-05-21 01:11:17 +0200 <c_wraith> Well, without IO you can't distinguish between different bottoms anyway
2025-05-21 01:11:51 +0200 <c_wraith> So it doesn't really matter what exception is thrown, the value is a bottom.
2025-05-21 01:11:54 +0200 <EvanR> but also if you mutate your perspective enough you can say haskell guarantees this or that ^
2025-05-21 01:12:20 +0200 <EvanR> the less actual stuff you care about the more abstract haskell gets
2025-05-21 01:12:59 +0200 <EvanR> e.g. next you could just ignore bottom entirely
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2025-05-21 01:22:09 +0200 <haskellbridge> <sm> LAC-Tech: I think it’s a recurring topic of language geeks but it doesn’t feel like a common annoyance for people building with haskell, we generally feel pretty confident in the “pure” parts of our code
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2025-05-21 01:25:11 +0200 <haskellbridge> <sm> eg I’ve been building small-medium Haskell apps for the last 18 years, they feel pretty deterministic
2025-05-21 01:25:44 +0200 <LAC-Tech> the property I am looking for is: same inputs, same outputs. notably this does not preclude mutable data structures, as long as they're internal - I'm not sure "pure" extends that far. system clocks, RNG, IO (maybe RNG falls under IO...), disk, network... that's stuff I'd want to exclude statically, if possible
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2025-05-21 01:29:56 +0200 <haskellbridge> <sm> Yes, all those require the IO type
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2025-05-21 01:32:27 +0200Sgeo(~Sgeo@user/sgeo) Sgeo
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2025-05-21 01:37:27 +0200 <LAC-Tech> aha, I thought so
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2025-05-21 01:40:25 +0200 <haskellbridge> <sm> Haskell code universally enforces this. There’s an escape hatch called unsafePerformIO which low level libs may use when it’s guaranteed harmless but you can statically check that too
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2025-05-21 01:42:47 +0200 <haskellbridge> <sm> (or even high level code, I do use it occasionally but that’s a choice)
2025-05-21 01:44:15 +0200 <EvanR> LAC-Tech, it's cool that you can use mutable structures in "pure code" via ST
2025-05-21 01:44:33 +0200 <EvanR> the user of the code doesn't have to know
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