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-rw-r--r--pkgs/development/libraries/haskell/free/default.nix21
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diff --git a/pkgs/development/libraries/haskell/free/default.nix b/pkgs/development/libraries/haskell/free/default.nix
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+++ b/pkgs/development/libraries/haskell/free/default.nix
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+{ cabal, bifunctors, comonad, comonadsFd, comonadTransformers
+, distributive, mtl, profunctors, semigroupoids, semigroups
+, transformers
+}:
+
+cabal.mkDerivation (self: {
+  pname = "free";
+  version = "3.4.2";
+  sha256 = "1x6pdkcxk6z9ndph2yzz5n21afc2330m0ryv4w67jsss5aa69fwb";
+  buildDepends = [
+    bifunctors comonad comonadsFd comonadTransformers distributive mtl
+    profunctors semigroupoids semigroups transformers
+  ];
+  meta = {
+    homepage = "http://github.com/ekmett/free/";
+    description = "Monads for free";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [ self.stdenv.lib.maintainers.ocharles ];
+  };
+})