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Logs: liberachat/#haskell

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2026-03-02 10:49:14 <Leary> I suggest you minimise it down to a reproducer and make an issue of it.
2026-03-02 10:51:12 <gentauro> sshine: what kind of "sourcery" do you put in `$CONFIG`? https://github.com/sshine/evm-opcodes/blob/09f7e8c5e3a19140a698fb161d2e4aee0b7a3843/.github/workflows/haskell.yml#L48-L60
2026-03-02 10:51:28 <[exa]> I assume it's because I yoloed and did global package installs with `--lib` etc
2026-03-02 10:51:42 <[exa]> Leary: would that count as weird ^ ?
2026-03-02 10:52:18 <Leary> Yes.
2026-03-02 10:52:43 <[exa]> ah, okay. :D
2026-03-02 10:54:55 <merijn> [exa]: --lib is the devil, never use it
2026-03-02 10:55:20 <merijn> It's hacky bypass for the new v2-build order
2026-03-02 10:55:38 <[exa]> any good alternative if I want to just play
2026-03-02 10:55:40 <[exa]> :D
2026-03-02 10:56:29 <merijn> [exa]: Basically, in the olden days you had a single global library database that had to be consistent or things exploded. In v2 the package database is automatically generated per project (allowing arbitrary many parallel installs of the same dependencies as long as they don't conflict "within a project")
2026-03-02 10:56:56 <merijn> [exa]: --lib does a global install into the old global package database, forcing EVERYTHING to use that exact version of the dependency you installed via --lib
2026-03-02 10:57:00 <[exa]> yap, my usecase is mainly "hey I have a ghci here and I want containers"
2026-03-02 10:57:09 <[exa]> the workaround is to make a small cabal env
2026-03-02 10:57:15 × misterfish quits (~misterfis@84.53.85.146) (Ping timeout: 245 seconds)
2026-03-02 10:57:16 <[exa]> but that's a bit too much work for a random hack
2026-03-02 10:57:31 <merijn> either a small cabal env or passing the dependency as a flag to cabal and using cabal repl over ghci
2026-03-02 10:59:19 <[exa]> oh it's actually the last example in `cabal repl --help`
2026-03-02 10:59:21 <[exa]> ok great
2026-03-02 10:59:29 <[exa]> let's nuke some .cabal then :)
2026-03-02 10:59:36 <[exa]> merijn Leary: thanks :)
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2026-03-02 11:04:42 <[exa]> merijn: is there any workalike of --build-depends option for `cabal exec` ?
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2026-03-02 12:15:41 <merijn> [exa]: What exactly are you trying to do?
2026-03-02 12:16:07 <[exa]> run a ghc on an ad-hoc file that requires a library
2026-03-02 12:16:22 <[exa]> ideally with least environment setup involved
2026-03-02 12:16:45 <[exa]> I thought `cabal exec --build-depends containers -- ghc blah.hs ...
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2026-03-02 12:29:19 <merijn> [exa]: fyi
2026-03-02 12:29:36 <merijn> cabal supports shebang execution where you can write the cabal file as comment at the top
2026-03-02 12:30:13 <merijn> [exa]: https://cabal.readthedocs.io/en/3.4/cabal-commands.html?highlight=env#cabal-v2-run
2026-03-02 12:30:14 <[exa]> ah ok I guess this wins
2026-03-02 12:30:16 <[exa]> thanks
2026-03-02 12:30:18 <[exa]> :D
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2026-03-02 13:06:34 <gentauro> merijn: cabalscript? Yes please :)
2026-03-02 13:08:54 <gentauro> btw, does cabal and hackage have official logos? (in svg format)?
2026-03-02 13:09:17 gentauro cabal seems to have this -> https://cabal.readthedocs.io/en/3.4/_static/Cabal-dark.png
2026-03-02 13:10:43 gentauro and hackage has this one -> https://hackage.haskell.org/static/favicon.png
2026-03-02 13:13:13 <int-e> https://wiki.haskell.org/Haskell_logos has the Haskell logo (hackage has a recolored version) and the Cabal one as SVG and a few more as well.
2026-03-02 13:14:48 <int-e> Oh. Maybe the haskell logo is not an SVG. An SVG version exists though, a couple of obvious links deeper.
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2026-03-02 13:24:25 <gentauro> int-e: found this one for hackage -> https://github.com/haskell/hackage-server/blob/master/datafiles/static/icons/hackage.svg
2026-03-02 13:24:42 <gentauro> but doesn't seem to match the one from https://hackage.haskell.org/
2026-03-02 13:24:44 <gentauro> Hmmmm
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2026-03-02 13:26:55 <int-e> gentauro: the main page uses the grayscale ones (which look wrong on a white brackground, but that's fixable :P)
2026-03-02 13:28:12 <int-e> And then I guess the favicon is rounded cut-out from a screenshot of that?
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2026-03-02 13:32:43 <int-e> gentauro: https://github.com/haskell/hackage-server/commit/9c81898f3b2d5bb5d5aa402f94cba69f70de58bc doesn't say how the favicon was created. so the trail goes cold here :P
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2026-03-02 13:34:35 <gentauro> int-e: I vote for using this instead -> https://people.willamette.edu/~fruehr/logos/PNGs/CataLaw.png
2026-03-02 13:34:44 gentauro from your link "Classic Haskell logos"
2026-03-02 13:34:53 <gentauro> just imagine writing Lips with bananas :o
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2026-03-02 13:45:39 <gentauro> int-e: I guess I should be able to re-create that logo as SVG as I have previously made a "derived" logo -> https://gitlab.com/FunctionalCopenhagenersMeetupGroup
2026-03-02 13:46:08 gentauro now I just need to find the SVG on my machine …
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2026-03-02 14:09:17 <gentauro> what is the GHC compiler flag that dissallows defining `sum types` with `product types`? For example: `data FooBar = Foo { foo :: Int } | Bar { bar :: String}`. both `foo` as well as `bar` have signatures like: `FooBar -> …`. So you end up with a runtime error if wrongly used …
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2026-03-02 14:15:13 <mangoiv> `-Wpartial-fields`
2026-03-02 14:16:03 <mangoiv> or `-Wincomplete-record-selectors` if you rather want to have it at use site (arguably the better one)
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