rekahsoft-gnu: Add ghc-heaps

* rekahsoft-gnu/packages/haskell-apps.scm (ghc-heaps): New variable

rekahsoft-gnu/packages/haskell-apps.scm

@@ -164,3 +164,22 @@ packages.  The first three components of the version number match the upstream
 jquery.dgtable version.  The package is designed to meet the redistribution
 requirements of downstream users (e.g.  Debian).")
     (license license:expat)))
+
+(define-public ghc-heaps
+  (package
+    (name "ghc-heaps")
+    (version "0.4")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (hackage-uri "heaps" version))
+        (sha256
+          (base32 "1zbw0qrlnhb42v04phzwmizbpwg21wnpl7p4fbr9xsasp7w9scl9"))))
+    (build-system haskell-build-system)
+    (home-page "http://github.com/ekmett/heaps/")
+    (synopsis "Asymptotically optimal Brodal/Okasaki heaps.")
+    (description
+      "Asymptotically optimal Brodal\\/Okasaki bootstrapped skew-binomial heaps from the
+paper <http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.48.973 \"Optimal
+Purely Functional Priority Queues\">, extended with a 'Foldable' interface.")
+    (license license:bsd-3)))