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2020-10-29 12:49:41 × knupfer quits (~Thunderbi@200116b82cb50a006c81a39a2011bb8b.dip.versatel-1u1.de) (Quit: knupfer)
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2020-10-29 13:00:47 <[exa]> is there anyone skilled in deconding cabal dependency errors? https://paste.tomsmeding.com/luHswXER
2020-10-29 13:01:01 × shatriff quits (~vitaliish@176.52.219.10) (Remote host closed the connection)
2020-10-29 13:01:04 <[exa]> (this is from `cabal install megaparsec`)
2020-10-29 13:01:38 shatriff joins (~vitaliish@176.52.219.10)
2020-10-29 13:01:49 <dminuoso> [__0] rejecting: base-4.14.0.0 (constraint from user target requires==4.13.0.0)
2020-10-29 13:02:06 <dminuoso> base and GHC versions are have a 1-to-1 correspondence
2020-10-29 13:03:11 <dminuoso> [exa]: What likely happened is this:
2020-10-29 13:03:19 × nbloomf quits (~nbloomf@2600:1700:ad14:3020:d1d4:d989:c09d:31fa) (Quit: My MacBook has gone to sleep. ZZZzzz…)
2020-10-29 13:03:24 <dminuoso> You have some package installed that depends on base-4.14.0.0 in your global thing
2020-10-29 13:03:45 <dminuoso> Dont use `cabal install`?
2020-10-29 13:05:23 <merijn> [exa]: The problem is "you're using too new a GHC", that's what all base dependencies mean (well, except for the ones meaning you have too old a GHC :p)
2020-10-29 13:05:37 machinedgod joins (~machinedg@142.169.78.145)
2020-10-29 13:06:25 <dminuoso> merijn: I dont think that's completely true.
2020-10-29 13:06:46 djellemah joins (~djellemah@2601:5c2:100:96c:e008:b638:39fe:6a54)
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2020-10-29 13:07:07 <dminuoso> megaparsec has had a base (>=4.11 && <5.0) bound for nearly a year now
2020-10-29 13:07:25 <merijn> base constraint can be limited by a transitive dependency
2020-10-29 13:07:34 <dminuoso> mm
2020-10-29 13:07:38 <merijn> Also, has update been run? :p
2020-10-29 13:07:42 <dminuoso> (constraint from user target requires==4.13.0.0)
2020-10-29 13:07:56 <dminuoso> Would be nice if cabal could tell where the constraint really comes from
2020-10-29 13:09:01 nbloomf joins (~nbloomf@2600:1700:ad14:3020:d1d4:d989:c09d:31fa)
2020-10-29 13:09:05 <merijn> Patches welcome? ;) *ducks*
2020-10-29 13:09:50 <dminuoso> Well Im not complaining
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2020-10-29 13:10:27 hackage polysemy-methodology 0.1.1.0 - Domain modelling algebra for polysemy https://hackage.haskell.org/package/polysemy-methodology-0.1.1.0 (locallycompact)
2020-10-29 13:12:35 × shatriff quits (~vitaliish@176.52.219.10) (Remote host closed the connection)
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2020-10-29 13:21:07 obihann joins (~jhann@156.34.160.69)
2020-10-29 13:21:13 <[exa]> is there a way to list stuff that requires ==4.13.0.0 ?
2020-10-29 13:21:27 <[exa]> I mean, a bit better error report would help
2020-10-29 13:21:50 <[exa]> btw I'm on ghc 8.8.3 so it's hopefully not "too much new"
2020-10-29 13:22:39 <merijn> [exa]: "too new" relative to whatever package(s) you're trying to use
2020-10-29 13:23:07 <merijn> [exa]: Did you run "cabal update" recently?
2020-10-29 13:23:18 <merijn> And which version of cabal-install do you have?
2020-10-29 13:23:33 × lemmih quits (~lemmih@2406:3003:2072:44:c5c7:520:a681:5f3f) (Remote host closed the connection)
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2020-10-29 13:25:58 <dminuoso> Also, why are you using `cabal install` for megaparsec?
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2020-10-29 13:32:58 hackage polysemy-methodology 0.1.2.0 - Domain modelling algebra for polysemy https://hackage.haskell.org/package/polysemy-methodology-0.1.2.0 (locallycompact)
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2020-10-29 13:33:41 <thblt> I asked recently if there was a tool to make all imports explicit, and remove unused ones: haskell-language-server does it.
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2020-10-29 13:34:01 <dminuoso> thblt: haskell-language-server itself?
2020-10-29 13:34:43 <thblt> dminuoso: I guess so! In my Emacs, lsp-ui offers to do it, so I guess it delegates to the server. Let me check.
2020-10-29 13:35:41 <thblt> I don't think I use any other tool. Apparently lsp-haskell calls into hlint too, but I don't think hlint can do that.
2020-10-29 13:36:01 <dminuoso> thblt: Id expect lsp-ui to do this.
2020-10-29 13:36:10 stef204 joins (~stef204@unaffiliated/stef-204/x-384198)
2020-10-29 13:36:37 <dminuoso> Well it could use hls to detect unused ones, but the file modification would be an editor feature
2020-10-29 13:37:19 <thblt> dminuoso: well the server should describe the possible modification somehow.
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2020-10-29 14:01:06 <tvrsky> hi
2020-10-29 14:01:21 <tvrsky> how do i begin on haskell?
2020-10-29 14:02:53 <dminuoso> tvrsky: Hi! You just did.
2020-10-29 14:03:21 <dminuoso> What kind of learning material are you looking for?
2020-10-29 14:03:40 <thblt> A nice free intro is LYAH http://learnyouahaskell.com/ (althouh you can buy too)
2020-10-29 14:04:16 <tvrsky> well i'm just interested on functional programming, so i'm looking for beginner's guides
2020-10-29 14:04:30 <dminuoso> tvrsky: Im quite fond of CIS194, it's modern and well thought of.
2020-10-29 14:04:46 <dminuoso> It's also freely available, and comes with well structured excercises that build ontop of each other
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2020-10-29 14:07:34 <tvrsky> that's awesome
2020-10-29 14:07:36 <tvrsky> thank you
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