From 6bbf429770499656be09185e3c1ee276f3f36152 Mon Sep 17 00:00:00 2001
From: John Soo <jsoo@panosoft.com>
Date: Sun, 7 Jul 2019 17:23:35 -0700
Subject: [PATCH 01/13] gnu: Add ghc-mtl.

---
 gnu/packages/haskell.scm | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
index d3ff27412f..6e62c2dd90 100644
--- a/gnu/packages/haskell.scm
+++ b/gnu/packages/haskell.scm
@@ -2733,6 +2733,29 @@ the paper \"Splittable Pseudorandom Number Generators Using Cryptographic
 Hashing\" by Claessen, Pałka for details and the rationale of the design.")
     (license license:bsd-3)))
 
+(define-public ghc-mtl
+  (package
+   (name "ghc-mtl")
+   (version "2.2.2")
+   (source
+    (origin
+     (method url-fetch)
+     (uri
+      (string-append "https://hackage.haskell.org/package/mtl/mtl-"
+                     version ".tar.gz"))
+     (sha256
+      (base32 "1xmy5741h8cyy0d91ahvqdz2hykkk20l8br7lg1rccnkis5g80w8"))))
+   (build-system haskell-build-system)
+   (home-page "https://github.com/haskell/mtl")
+   (synopsis "Monad classes, using functional dependencies")
+   (description
+    "Monad classes using functional dependencies, with instances for various
+monad transformers, inspired by the paper \"Functional Programming with
+Overloading and Higher-Order Polymorphism\", by Mark P Jones, in \"Advanced
+School of Functional Programming\", 1995
+http://web.cecs.pdx.edu/~mpj/pubs/springschool.html.")
+   (license license:bsd-3)))
+
 (define-public ghc-transformers-base
   (package
     (name "ghc-transformers-base")
-- 
2.22.0