From 7a45ef7e25026334469c36910848d98551e1c729 Mon Sep 17 00:00:00 2001
From: John Wiegley <johnw@newartisans.com>
Date: Mon, 16 Jun 2014 14:00:42 -0700
Subject: [PATCH] haskell-equivalence: new expression

---
 .../libraries/haskell/equivalence/default.nix | 20 +++++++++++++++++++
 pkgs/top-level/haskell-packages.nix           |  2 ++
 2 files changed, 22 insertions(+)
 create mode 100644 pkgs/development/libraries/haskell/equivalence/default.nix

diff --git a/pkgs/development/libraries/haskell/equivalence/default.nix b/pkgs/development/libraries/haskell/equivalence/default.nix
new file mode 100644
index 00000000000..c25deac82c3
--- /dev/null
+++ b/pkgs/development/libraries/haskell/equivalence/default.nix
@@ -0,0 +1,20 @@
+{ cabal, mtl, QuickCheck, STMonadTrans, testFramework
+, testFrameworkQuickcheck2
+}:
+
+cabal.mkDerivation (self: {
+  pname = "equivalence";
+  version = "0.2.3";
+  sha256 = "0dd986y0sn89fparyz6kz9yhzysbqjcp8s99r81ihghg7s9yc743";
+  buildDepends = [ mtl STMonadTrans ];
+  testDepends = [
+    mtl QuickCheck STMonadTrans testFramework testFrameworkQuickcheck2
+  ];
+  doCheck = false;
+  meta = {
+    homepage = "https://bitbucket.org/paba/equivalence/";
+    description = "Maintaining an equivalence relation implemented as union-find using STT";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+  };
+})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 755fbfc24a9..0bd2a9a40d9 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -700,6 +700,8 @@ self : let callPackage = x : y : modifyPrio (newScope self x y); in
 
   entropy = callPackage ../development/libraries/haskell/entropy {};
 
+  equivalence = callPackage ../development/libraries/haskell/equivalence {};
+
   erf = callPackage ../development/libraries/haskell/erf {};
 
   errorcallEqInstance = callPackage ../development/libraries/haskell/errorcall-eq-instance {};