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2020-09-25 17:56:32 <nshepperd> i wish for a ghc which can produce platform independent STG
2020-09-25 17:56:53 <nshepperd> so i can just write an STG interpreter in java to make things run on phones :>
2020-09-25 17:57:12 <fluturel> IoT with haskell actually sounds really interesting
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2020-09-25 17:58:10 <davean> Theres the ghci bytecode? I don't know a ton about it. Bytecode isn't really enough - you need the RTS.
2020-09-25 17:58:31 <monochrom> "just write an STG interpreter" is also easier said than done.
2020-09-25 17:59:05 <davean> And why you'd do all that to run Haskell on a phone I don't know
2020-09-25 17:59:09 <davean> You CAN compile to target a phone
2020-09-25 17:59:19 <davean> a lot of the hard part is the PDK component
2020-09-25 17:59:41 <monochrom> which is also what davean said and I had in mind. Interpeter or compiler, you need an RTS or equivalent that does all the amazing multi-green-threading and I/O multiplexing and...
2020-09-25 17:59:59 <dolio> What happened to the GHC fork that ran on JVM?
2020-09-25 18:00:02 × ccallahan1 quits (~ccallahan@195.140.213.38) ()
2020-09-25 18:00:18 <davean> dolio: which one? eta?
2020-09-25 18:00:22 <davean> There were a few
2020-09-25 18:00:41 <dolio> Were there? I was thinking of eta, I think.
2020-09-25 18:00:58 hackage polysemy-test 0.3.0.0 - Polysemy effects for testing https://hackage.haskell.org/package/polysemy-test-0.3.0.0 (tek)
2020-09-25 18:01:19 <dolio> Running STG on JVM seems non-trivial anyway, because of the 'fixing space leaks in a garbage collector' thing that the JVM's garbage collector won't be doing.
2020-09-25 18:01:32 <monochrom> But consider translating hugs from C to Java. :)
2020-09-25 18:01:48 <nshepperd> dolio: what's that
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2020-09-25 18:02:28 <dolio> nshepperd: It's the title of a paper by Wadler, I think.
2020-09-25 18:02:36 <monochrom> <bad pun time> eta has an ETA of "indefinite" </bad pun time> :)
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2020-09-25 18:04:48 <phadej> nshepperd: TL;DR when GC find a value which is fst (a, b); i.e. selector applied to already evaluated constructor, it evaluates it
2020-09-25 18:05:04 <phadej> thus `b` could be possibly freed
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2020-09-25 18:08:58 hackage polysemy-test 0.3.0.1 - Polysemy effects for testing https://hackage.haskell.org/package/polysemy-test-0.3.0.1 (tek)
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2020-09-25 18:10:41 <phadej> I *guess* if JVM had native notion of thunks, its GCs would do that optimization
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2020-09-25 18:12:26 <nshepperd> interesting
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2020-09-25 18:14:34 <dsal> Is polysemy still a thing?
2020-09-25 18:14:34 <davean> the 'eta' idea was to use the RTTI/Debugging support to do that optimization, right?
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2020-09-25 18:16:15 <phadej> davean: I don't know
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2020-09-25 18:18:52 <pie_> man I dont know if parser combinators are hard to debug or just parsy as a python parser combinator library...
2020-09-25 18:19:02 <pie_> i make prgress and get stuck on some self induced bug for hours
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2020-09-25 18:23:28 hackage wai-session-postgresql 0.2.1.3 - PostgreSQL backed Wai session store https://hackage.haskell.org/package/wai-session-postgresql-0.2.1.3 (hc)
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2020-09-25 18:26:25 <nshepperd> was your problem too much backtracking or not enough backtracking
2020-09-25 18:26:46 <monochrom> I think parser combinators are harder to debug (than ordinary recursive functions). I tried to add Debug.Trace messages, and quickly realized I couldn't design useful debugging messages.
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2020-09-25 18:36:25 <sm[m]> I have a dbgparse function that I stick into megaparsec parsers. megaparsec itself provides a dbg, also. Such things are definitely needed at times
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2020-09-25 19:03:00 <glguy> parser combinators turn you into the parser compiler. using them for more than simple parsers generates debugging challenges and makes it hard to know what the grammar you actually support is
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