41/53: gnu: Add ghc-convertible.

[Ricardo Wurmus]

rekado pushed a commit to branch master
in repository guix.

commit f8362eac6a6cd6dbd813209c72d1a915ff5f0fd0
Author: Ricardo Wurmus <address@hidden>
Date:   Wed Aug 15 12:09:57 2018 +0200

    gnu: Add ghc-convertible.
    
    * gnu/packages/haskell.scm (ghc-convertible): New variable.
---
 gnu/packages/haskell.scm | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index 0eaf142..dada57d 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -453,6 +453,34 @@ interactive environment for the functional language 
Haskell.")
 determine the hostname.")
     (license license:bsd-3)))
 
+(define-public ghc-convertible
+  (package
+    (name "ghc-convertible")
+    (version "1.1.1.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append "https://hackage.haskell.org/package/convertible/";
+                           "convertible-" version ".tar.gz"))
+       (sha256
+        (base32
+         "0v18ap1mccnndgxmbfgyjdicg8jlss01bd5fq8a576dr0h4sgyg9"))))
+    (build-system haskell-build-system)
+    (inputs
+     `(("ghc-old-time" ,ghc-old-time)
+       ("ghc-old-locale" ,ghc-old-locale)
+       ("ghc-mtl" ,ghc-mtl)
+       ("ghc-text" ,ghc-text)))
+    (home-page "https://hackage.haskell.org/package/convertible";)
+    (synopsis "Typeclasses and instances for converting between types")
+    (description
+     "This package provides a typeclass with a single function that is
+designed to help convert between different types: numeric values, dates and
+times, and the like.  The conversions perform bounds checking and return a
+pure @code{Either} value.  This means that you need not remember which specific
+function performs the conversion you desire.")
+    (license license:bsd-3)))
+
 (define-public ghc-libxml
   (package
     (name "ghc-libxml")