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diff --git a/pkgs/development/libraries/haskell/reducers/default.nix b/pkgs/development/libraries/haskell/reducers/default.nix
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+{ cabal, comonad, fingertree, hashable, keys, pointed
+, semigroupoids, semigroups, text, transformers
+, unorderedContainers
+}:
+
+cabal.mkDerivation (self: {
+  pname = "reducers";
+  version = "3.10.1";
+  sha256 = "0pgywdgq0rqir95n4z3nzmyx5n54a1df9abyanz4qfv0g080fjkz";
+  buildDepends = [
+    comonad fingertree hashable keys pointed semigroupoids semigroups
+    text transformers unorderedContainers
+  ];
+  meta = {
+    homepage = "http://github.com/ekmett/reducers/";
+    description = "Semigroups, specialized containers and a general map/reduce framework";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+  };
+})