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2020-10-25 15:01:39 <voso534> Guest63439 even hGetLine may wait.... Try to add print as the first line of your function
2020-10-25 15:01:44 <merijn> Guest63439: What are you calling it with, though?
2020-10-25 15:02:00 <merijn> Guest63439: Because if the first call to "talk" gets an empty MVar it will block and stay empty forever
2020-10-25 15:02:42 <fendor> asheshambasta, like, for a single ghc version, you can't switch the version of base that it uses, right? You will get a similar error message with cabal. Maybe it is the same for ghcjs, you can't change the reflex version for your ghcjs, but some dependency needs another reflex version.
2020-10-25 15:03:17 <fendor> in that sense, every ghc version comes with a base version pre-installed in its packagedb that can not be changed.
2020-10-25 15:03:33 <voso534> Guest63439 I mean something like
2020-10-25 15:03:36 <voso534> ```
2020-10-25 15:03:52 <Guest63439> yep if i add a print at the top of the function i can see it every time i should
2020-10-25 15:03:58 <voso534> heck... how to write multiline here? )
2020-10-25 15:04:00 <Guest63439> the MVar should never be empty
2020-10-25 15:04:07 × dbmikus quits (~dbmikus@cpe-76-167-86-219.natsow.res.rr.com) (Ping timeout: 260 seconds)
2020-10-25 15:04:40 <asheshambasta> fendor: correct, although I'd expect there to be a way to verify that? There's nothing in the servant-reflex.cabal file that I consider suspect.
2020-10-25 15:04:45 <merijn> Guest63439: You're not calling talk (well, except recursively) in that code
2020-10-25 15:04:48 <voso534> OK, what happens with the print after hGetLine? Is it shown?
2020-10-25 15:05:03 <Guest63439> i didnt past the whole script
2020-10-25 15:05:03 × gxt quits (~gxt@gateway/tor-sasl/gxt) (Ping timeout: 240 seconds)
2020-10-25 15:05:05 <merijn> Guest63439: Without seeing how you initially call "talk" it's impossible to say
2020-10-25 15:05:38 <Guest63439> how woud you trace the let called "newState" in this function ?
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2020-10-25 15:06:03 <asheshambasta> fendor: not to forget, going to the locally checked out servant-reflex dir., I'm able to update its reflex-platform branch/rev to the same as my project (that depends on servant-reflex), and I can successfully run `nix-shell --run 'cabal new-repl'`; which, I assume, would use the same GHC/GHCJS version?
2020-10-25 15:06:06 <merijn> @quote refreshing.desert
2020-10-25 15:06:06 <lambdabot> chromatic says: My productivity increased when Autrijus told me about Haskell's trace function. He called it a refreshing desert in the oasis of referential transparency.
2020-10-25 15:06:10 <merijn> Guest63439: ^^
2020-10-25 15:06:30 <merijn> See the Debug.Trace module
2020-10-25 15:06:45 <voso534> you can wrap newState everywhere where do you like - right hand of let for example. If it's evaluating then it will be shown on the console
2020-10-25 15:06:45 × toorevitimirp quits (~tooreviti@117.182.180.36) (Ping timeout: 260 seconds)
2020-10-25 15:07:04 <fendor> asheshambasta, hm, if my theory holds, then it is only coincidentally a dependency problem with servant-reflex. You can try to remove that dependency and see if it finds a build-plan.
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2020-10-25 15:07:20 Gurkenglas_ is now known as Gurkenglas
2020-10-25 15:07:34 <asheshambasta> If I remove servant-reflex as a dependency, things build.
2020-10-25 15:07:46 <voso534> but I think if you will add all those `print`s (after each line), then you will see that the code is blocked somewhere - it's my hypotheses
2020-10-25 15:08:07 <asheshambasta> I didn't even know what cabal meant with .../installed-...
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2020-10-25 15:08:50 <fendor> oh well, if that works, I don't know then :(
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2020-10-25 15:09:32 <Guest63439> voso534 i tried and i can see that the code is executing from the start to the end, i think i dont understand how trace is supposed to be used inside a "do" statement
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2020-10-25 15:10:19 <asheshambasta> to me it seems like bulmex and servant-reflex cannot agree on the reflex version; and the message with .../installed is a complete mystery to me; and I find no signs of version bounds on reflex in either bulmex nor in servant-reflex.
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2020-10-25 15:10:41 <asheshambasta> (both are overriden packages in my reflex `project`)
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2020-10-25 15:13:19 <fendor> asheshambasta, what reflex version does your project have when you do not depend on servant-reflex?
2020-10-25 15:13:45 <voso534> Guest63439 hm... another idea is to declare strict variable with `let`, something like `let !newState = traceShow result (fst result)`
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2020-10-25 15:15:03 <asheshambasta> fendor: I believe that's decided by the pinned reflex-platform version no? If so, I'm using https://gist.github.com/asheshambasta/423fd27b04c37e2a8f14bf84068f139a#file-sources-json-L50-L61
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2020-10-25 15:15:32 <fendor> I have no idea about the reflex-platform, unfortunately
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2020-10-25 15:15:47 <Guest63439> voso534 here : https://pastebin.com/he2cch9e still printing nothing :/
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2020-10-25 15:16:40 <asheshambasta> fendor: AFAICS, it is a curated set of packages within nix (further curation, yay!))
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2020-10-25 15:18:27 <voso534> Guest63439 1) do you see "test2" in the console? 2) more correct is IMHO to use trace/traceShow with the value which is used actually, `x` is not used, so maybe it's not evaluated at all. Better use trace/traceShow directly in the declaration of the newState
2020-10-25 15:19:28 <Guest63439> voso534 do see test2, i will try to use it in newState declaration
2020-10-25 15:21:11 <asheshambasta> fendor: anyway, thanks for helping. I think I understand cabal less and less as time goes on. :-)
2020-10-25 15:21:41 <fendor> not sure this is cabal's fault, though :/
2020-10-25 15:21:56 <fendor> the concept of pre-installed libraries is a bit hard to grasp, imo
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2020-10-25 15:23:39 <asheshambasta> yeah agreed, I think nix also makes this harder to understand.
2020-10-25 15:25:41 <Guest63439> ok i got something, thanks voso534... i guess newState is never executed, by calling trace inside the answer declaration it works
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2020-10-25 15:28:24 <voso534> Guest63439 (y) if something is not used in Haskell, it's not evaluated ("executed")
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2020-10-25 16:02:08 <emmanuel_erc> monsterchrom: Unfortunately, I couldn't put this coworker on the ignore list before. But I probably won't be working with them for much longer (and they're a PM to boot)
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