gnu: Add ghc-deepseq-generics.

* gnu/packages/haskell.scm (ghc-deepseq-generics): New variable.

gnu/packages/haskell.scm

@@ -4941,6 +4941,39 @@ communication between web applications and web servers.")
 functionality.")
     (license expat)))
 
+(define-public ghc-deepseq-generics
+  (package
+    (name "ghc-deepseq-generics")
+    (version "0.1.1.2")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "http://hackage.haskell.org/package/"
+                                  "deepseq-generics/deepseq-generics-"
+                                  version ".tar.gz"))
+              (sha256
+               (base32
+                "01pvigx8n9p8hwbzp2qiq6kzf7cxiam843jz2sjgliacmmp1v7l3"))))
+    (build-system haskell-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-after 'unpack 'relax-ghc-prim-dependency
+          (lambda _
+            (substitute* "deepseq-generics.cabal"
+              (("< 0.4") "< 0.5"))
+            #t)))))
+    (native-inputs
+     `(("ghc-hunit" ,ghc-hunit)
+       ("ghc-test-framework" ,ghc-test-framework)
+       ("ghc-test-framework-hunit" ,ghc-test-framework-hunit)))
+    (home-page "https://github.com/hvr/deepseq-generics")
+    (synopsis "Generic RNF implementation")
+    (description
+     "This package provides a @code{GHC.Generics}-based
+@code{Control.DeepSeq.Generics.genericRnf} function which can be used for
+providing an 'rnf' implementation.")
+    (license bsd-3)))
+
 (define-public idris
   (package
     (name "idris")