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nixpkgs/pkgs/development/libraries/haskell/contravariant/default.nix

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{ cabal, tagged, transformers, transformersCompat }:
cabal.mkDerivation (self: {
pname = "contravariant";
version = "0.4.4";
sha256 = "1b4422wpcyvrf4r7rr8c8wa008f5ykaxs17vr4plp91rcczr87s4";
buildDepends = [ tagged transformers transformersCompat ];
meta = {
homepage = "http://github.com/ekmett/contravariant/";
description = "Contravariant functors";
license = self.stdenv.lib.licenses.bsd3;
platforms = self.ghc.meta.platforms;
};
})