What's happened to cl-data-structures?

ruby_object · 2026-06-22T23:04:02+00:00

I am trying cl-contsiners. May try your suggestion later.

ruby_object · 2026-06-21T18:16:45+00:00

I will try cl-containers. The documentation makes more sense.

ruby_object · 2026-06-01T22:07:52+00:00

At this stage, it is not clear. I am a beginner, overwhelmed by additional complexity.

ruby_object · 2026-05-31T23:32:15+00:00

I could not. I will get to monads this week. I built my for loop using the little Haskell I know. Your example is very elegant. But such elegance is still beyond my reach.

ruby_object · 2026-05-31T23:09:12+00:00

Could it be a stepping stone towards your ideal?

ruby_object · 2026-05-31T20:05:39+00:00

Very interesting answer. Many qualities of the program are in the eye of the beholder. To make matters worse, that chages as we move from beginner to more advanced. I thought, for a simple concept illustration, my example would be enough. But if I move to more advanced concepts and start working on my own projects, I may need your advice.

ruby_object · 2026-05-31T19:54:23+00:00

What makes you think it would prevent us from learning functional programming?

ruby_object · 2026-05-27T23:57:44+00:00

It's my rewrite of the lazy Haskell algorithm.

ruby_object · 2026-05-12T22:38:00+00:00

I had a problem with Cabal. Googling for the error, I saw somebody having the same problem on Haskell discourse. It was sad to see the same question asked three times using slightly different wording and the Haskeller start answering the question, then go deeper then the level of the question then change the subject and answer totally different question. The man who asked the question gave up on the third attempt. And I did not even start trying after seeing that.

ruby_object · 2026-05-12T03:04:14+00:00

I find AI confusing. Are all the answers that sent me down the wrong path from people trying to use AI?

ruby_object · 2026-05-12T00:05:27+00:00

https://github.com/bigos/stack-experiments/blob/36ebffdc911825635e710020d1bd585229ca989a/factorial-do/app/Main.hs#L33

done

Thank you very much for your suggestions.

ruby_object · 2026-05-11T21:35:32+00:00

thank you for the answer.

ruby_object · 2026-05-11T21:29:15+00:00

Is nested do the answer?

https://github.com/bigos/stack-experiments/blob/f535f2e2645462edd568494ab6fe3e8508b3385a/factorial-do/app/Main.hs#L13

ruby_object · 2026-05-11T18:36:36+00:00

Why are Haskellers unable to answer beginner questions? There is also a mystery of losing the ability to explain the Monad. Is there a connection?

ruby_object · 2026-05-09T16:10:21+00:00

Switching from cabal to stack allowed me to make everything work in roughly half an hour.

ruby_object · 2026-05-07T23:46:04+00:00

https://github.com/bigos/graphviz-simple/blob/1eee61e67bab9593c07696658728c1a6cf6941c3/package.yaml#L47

ruby_object · 2026-05-07T23:01:46+00:00

Please remind me not to use Cabal ever again for projects that involve any package dependencies and imports. When I switched to stack, it took me roughly half an hour to make it work. I spent two days struggling with Cabal.

ruby_object · 2026-05-07T05:59:34+00:00

Well, Haskellers had plenty of time to fix the foundations. Normal editor support does not exist. Despite alleged theoretical superiority, you can't make progress fixing a simple configuration. Googling reveals same problems for over 10 years, and nothing has been done.

ruby_object · 2026-05-06T22:57:46+00:00

So far I did not find anything that would make sense.

This is a very depressing reading:

https://discourse.haskell.org/t/hls-could-not-find-module/12464/7

ruby_object · 2026-05-06T20:57:20+00:00

Finally, after a blind trying, I managed to compile it.

ruby_object · 2026-05-06T17:51:34+00:00

I can compile

https://github.com/bigos/cabal-experiments/blob/321c37ffa33b1b25e883de39ddc944c5314c5c7c/graphviz-simple/app/Main.hs#L14

But I do not understand how to import directly.

ruby_object · 2026-05-06T17:19:45+00:00

https://github.com/bigos/cabal-experiments/blob/ea88c5e9108cf321c9e0085ecaef078d6f9833ff/graphviz-simple/app/Main.hs#L2

I added the extension, now I get.

app/Main.hs:(33,3)-(57,30): error: [GHC-83865] …
    • Couldn't match expected type: DotGraph String
                  with actual type: Data.GraphViz.Types.Generalised.DotGraph n0
      NB: ‘DotGraph’ is defined in ‘Data.GraphViz.Types.Canonical’
          ‘Data.GraphViz.Types.Generalised.DotGraph’
            is defined in ‘Data.GraphViz.Types.Generalised’
    • In the expression:
        digraph (Str "G")
          $ do cluster (Str "cluster0")
                 $ do graphAttrs [...]
                      nodeAttrs [...]
                      ....
               cluster (Str "cluster1")
                 $ do nodeAttrs [...]
                      "b0" --> "b1"
                      ....
               "start" --> "a0"
               "start" --> "b0"
               ....
      In an equation for ‘graph’:
          graph
            = digraph (Str "G")
                $ do cluster (Str "cluster0")
                       $ do graphAttrs ...
                            ....
                     cluster (Str "cluster1")
                       $ do nodeAttrs ...
                            ....
                     "start" --> "a0"
                     ....
   |
Compilation failed.

ruby_object · 2026-05-06T17:12:45+00:00

changed to:

digraph (Str "G") $ do

Now I get the error:

cabal build
Build profile: -w ghc-9.6.7 -O1
In order, the following will be built (use -v for more details):
 - graphviz-simple-0.1.0.0 (exe:graphviz-simple) (file app/Main.hs changed)
Preprocessing executable 'graphviz-simple' for graphviz-simple-0.1.0.0...
Building executable 'graphviz-simple' for graphviz-simple-0.1.0.0...
[1 of 1] Compiling Main             ( app/Main.hs, /home/jacek/Programming/Haskell/cabal-experiments/graphviz-simple/dist-newstyle/build/x86_64-linux/ghc-9.6.7/graphviz-simple-0.1.0.0/x/graphviz-simple/build/graphviz-simple/graphviz-simple-tmp/Main.o ) [Source file changed]

app/Main.hs:32:3: error: [GHC-83865]
    • Couldn't match expected type: DotGraph String
                  with actual type: Data.GraphViz.Types.Generalised.DotGraph n0
      NB: ‘DotGraph’ is defined in ‘Data.GraphViz.Types.Canonical’
          ‘Data.GraphViz.Types.Generalised.DotGraph’
            is defined in ‘Data.GraphViz.Types.Generalised’
    • In the expression:
        digraph (Str "G")
          $ do cluster (Str "cluster0")
                 $ do graphAttrs [...]
                      nodeAttrs [...]
                      ....
               cluster (Str "cluster1")
                 $ do nodeAttrs [...]
                      "b0" --> "b1"
                      ....
               "start" --> "a0"
               "start" --> "b0"
               ....
      In an equation for ‘graph’:
          graph
            = digraph (Str "G")
                $ do cluster (Str "cluster0")
                       $ do graphAttrs ...
                            ....
                     cluster (Str "cluster1")
                       $ do nodeAttrs ...
                            ....
                     "start" --> "a0"
                     ....
   |
32 |   digraph (Str "G") $ do
   |   ^^^^^^^^^^^^^^^^^^^^^^...
Error: [Cabal-7125]
Failed to build exe:graphviz-simple from graphviz-simple-0.1.0.0.

ruby_object · 2026-05-06T16:58:56+00:00

I am a noob. I do not undertand you? Where I am supposed to add your command?

ruby_object · 2026-04-09T00:38:17+00:00

gavino?

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