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2021-04-30 17:21:31 × zva quits (~zava@ip5f5bdf0f.dynamic.kabel-deutschland.de) (Ping timeout: 252 seconds)
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2021-04-30 17:24:12 <hololeap> thblt: this also might be a good resource for you: https://lexi-lambda.github.io/blog/2021/03/25/an-introduction-to-typeclass-metaprogramming/
2021-04-30 17:25:03 <jpe90> Hi everyone, I have a beginner question
2021-04-30 17:25:18 × vilpan quits (~0@212.117.1.172) (Quit: Leaving.)
2021-04-30 17:25:21 <jpe90> I'm studying an example from the Hutton book (https://paste.tomsmeding.com/UfWOndmM) and I'm trying to get a step-by-step understanding of how the expression is being evaluated.
2021-04-30 17:25:50 <jpe90> The best way that I found was to load the file in ghci, place a breakpoint in main, then repeatedly enter :step, :list to see the current expression being evaluted, :force on unevaluated variables, and then substituting in the variables into the expression in the current step.
2021-04-30 17:26:13 <jpe90> I found that a little cumbersome to do and was wondering if there's other options for viewing intermediate values of expressions as they're being evaluated.
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2021-04-30 17:27:05 <geekosaur> http://hackage.haskell.org/package/ghc-vis
2021-04-30 17:28:19 × Adam345 quits (~textual@2.133.253.255) (Quit: My MacBook Air has gone to sleep. ZZZzzz…)
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2021-04-30 17:32:31 <jpe90> I did see that actually! I got an error message when I tried to install it with cabal earlier about being unable to resolve dependencies, I'll go back and give that another go
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2021-04-30 17:34:35 <hololeap> jpe90: you may want to try building it with stack, since that keeps the dependencies "locked" to some set that works
2021-04-30 17:34:55 <hololeap> there is a stack.yaml in the source repo: https://github.com/def-/ghc-vis
2021-04-30 17:35:09 <monochrom> I think the key is "pkg-config package librsvg-2.0>=2.16.0, not found in the pkg-config database". This cannot be solved by stack.
2021-04-30 17:35:49 <hololeap> hm, i didn't see that
2021-04-30 17:36:21 <monochrom> My model of "upon the words 'error message' the brain shuts down" has one more data point.
2021-04-30 17:37:14 <hololeap> monochrom: where are you seeing this pkg-config error?
2021-04-30 17:37:28 <monochrom> "cabal install --dry-run ghc-vis"
2021-04-30 17:38:04 <hololeap> oh, ok, but their system might be different (they may have that library installed)
2021-04-30 17:38:36 × s00pcan quits (~chris@075-133-056-178.res.spectrum.com) (Remote host closed the connection)
2021-04-30 17:42:44 <thblt> hololeap: thanks!
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2021-04-30 17:48:08 <tomsmeding> shapr: wasn't today #haskell's birthday?
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2021-04-30 17:55:29 <monochrom> You will need eg ubuntu's librsvg2-dev and libgtk-3-dev.
2021-04-30 17:56:22 <monochrom> And then svgcairo's Setup.hs wants Cabal<3.1. Use --allow-newer to overrule that.
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2021-04-30 18:06:25 <jlv> Is there any way to remove a repository in `cabal.project`, or otherwise disable Cabal from trying to manage dependencies? I want all dependencies managed by my Nix shell, for reproducibility and consistency between `nix-build` and Cabal builds.
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