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It's not exactly a "website devoted to crowdsourced solutions to small coding problems", more like a site for learning languages through comparing different possible solutions to simple coding problems, but the UI you describe (even down to the colour) sounds like https://exercism.io .
One popular approach is to just bundle the C libraries with your packages, see for example pcre2.
And stuff like haskell.nix is supposed to let you configure things with stack or cabal or whatever tool you find most convenient, and let nix do the rest.
% ghci GHCi, version 8.8.4: https://www.haskell.org/ghc/ :? for help Loaded GHCi configuration from /home/bss/.ghc/ghci.conf GHCi> data Job = MkJob { state :: Int } deriving Show data Job = ... GHCi> MkJob 42 MkJob {state = 42} GHCi> it{state=69} MkJob {state = 69} GHCi> it { state = 420 } MkJob {state = 420}
Did you mean: https://github.com/ocharles/effect-zoo?
I would also like to add: https://github.com/xnning/EvEff/
as type families have to be saturated (at least without this).
See also the linear library, it contains types like data V3 a = V3 a a a with all of the useful instances.