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16:53 <rockfruit> I'm using a stack.yaml with resolver=lts-11.9, trying to add hsdev: https://lpaste.net/2970457625965101056 I'm gettin an error about "unsupported GHC version": https://lpaste.net/5723916521835593728 question: how to discover what GHC version (or resolver) is needed? hsdev is *hard* to build!
16:55 <rockfruit> versioning/packaging is my biggest blocker now... I've been backwatering for a couple days :/
16:56 <nitrix> rockfruit: stack resolve
16:57 <rockfruit> rite!
16:57 <nitrix> It'll recommend you the changes needed to your stack.yaml file in order to satisfy all the dependencies.
16:57 <nitrix> Assuming it's do-able.
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16:59 <nitrix> I guess that's one reason why you'd want to keep the lower & upper bounds of your dependencies as large as possible.
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17:45 <rockfruit> i guess it's a general "computer" question; if I get a segfault during 'stack build', and it's gone when I retry, is this signalling a possible hardware error? if it was caused by anything in code, would it make sense that the segfault would occur again? or is this just one of those 'not enough information' queries?
17:47 <nitrix> During stack build? I'd suspect an issue with stack, GHC or TemplateHaskell.
17:48 <nitrix> Your code isn't running yet, so it shouldn't be the culprit (unless you use TemplateHaskell which lets you run Haskell code during compilation).
17:52 <nitrix> rockfruit: stack has internal caching in the .stack-work folder. It's possible that artifacts from previous compilations are causing issues, or that changes to your .cabal file or stack.yaml file exercebates a problem with their code.
17:53 <nitrix> In general, deleting .stack-work and starting over tends to fix any temporary compilation issues.
17:53 <nitrix> I wouldn't worry about it, but it could be worth reporting it to them.
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18:18 <rockfruit> I just kept hammering the "expect a different result" button, and it built on retry nr 6 without segfault or exitfailure(-11). Well, of course, sublimehaskell now wants an older version, but here we go!
18:20 <nitrix> Well that's embarassing. Glad it worked :/
18:20 <rockfruit> I'm a titan of patience now. I want to get over the hump already!
18:20 <nitrix> Haha :)
18:21 <rockfruit> and it still isn't out of my mind that this old laptop's ram is dying.
18:21 <rockfruit> shrug
18:22 <rockfruit> with four cores, the most CPU a process ever uses is ~30%. stack/cabal/ghci happily much 95%+ :))
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18:25 <nitrix> Now you've got a lap warmer :)
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18:39 <rockfruit> one thing that has driven me nuts before, a question: if a module does not export something, is there simply no way to "get at it" then?
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18:42 <p0lyph3m> rockfruit: its a feature not a bug ; google "smart constructors"
18:43 <rockfruit> click click type click
18:52 <rockfruit> interesting and certainly useful, not sure how it is related though.
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18:55 <p0lyph3m> rockfruit: you shouldnt mess around with some modules internals ; the whole purpose of modularisation is sepration and encapsulation
18:56 <p0lyph3m> *separation ^
18:57 <rockfruit> yip, and I appreciate that. some modules however, should export stuff that they don't. I guess that's a bug though; slightly frustrating when I finally figure out what to do, and get it just right.. and instead, I have to cargo in twenty lines of seemingly fairly advanced stuff :/
18:57 <rockfruit> I mean, a bug in those modules.
18:57 <rockfruit> something about eating cake and having it.
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19:04 <p0lyph3m> the interfac of the module (its exports) is crafted by the module author in regard of the usecase(es) he had in mind while writing it. you shouldnt be able to tear down a wall with a car , it wasnt designed for that, still someone could have that idea :)
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19:10 <nitrix> rockfruit: There are work-arounds. I don't recommend it, but you can use `true-name` to violated the module boundaries via TemplateHaskell.
19:10 <nitrix> rockfruit: Another option sometimes are orphan instances, to implement an instance that the author would've forgotten until the patch makes it upstream.
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19:11 <nitrix> Usually the best is to make a fork of the library with the needed changes for your project to use, then try to get those changes accepted upstream.
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19:40 <rockfruit> thanks.
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