From 11db97c6f480ba7b439f06dd2ba96ace3639efd8 Mon Sep 17 00:00:00 2001
From: John Soo <address@hidden>
Date: Fri, 13 Dec 2019 07:04:13 -0800
Subject: [PATCH 02/22] gnu: Add ghc-transformers.

* gnu/packages/haskell-xyz.scm (ghc-transformers): New variable.
---
 gnu/packages/haskell-xyz.scm | 43 ++++++++++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/gnu/packages/haskell-xyz.scm b/gnu/packages/haskell-xyz.scm
index 8d27d64cc0..64a27e8484 100644
--- a/gnu/packages/haskell-xyz.scm
+++ b/gnu/packages/haskell-xyz.scm
@@ -11644,6 +11644,49 @@ from a shell.  The @code{tldr} pages are a community effort to simplify the
 man pages with practical examples.")
     (license license:bsd-3)))
 
+(define-public ghc-transformers
+  (package
+    (name "ghc-transformers")
+    (version "0.5.6.2")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (string-append
+             "mirror://hackage/package/transformers/transformers-"
+             version
+             ".tar.gz"))
+       (sha256
+        (base32
+         "0v66j5k0xqk51pmca55wq192qyw2p43s2mgxlz4f95q2c1fpjs5n"))))
+    (build-system haskell-build-system)
+    (home-page
+     "http://hackage.haskell.org/package/transformers")
+    (synopsis "Concrete functor and monad transformers")
+    (description
+     "A portable library of functor and 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.
+
+This package contains:
+@itemize
+@item
+the monad transformer class (in \"Control.Monad.Trans.Class\")
+@item
+concrete functor and monad
+transformers, each with associated operations and functions to lift
+operations associated with other transformers.
+@end itemize
+The package can be used on its own in portable Haskell code, in which
+case operations need to be manually lifted through transformer
+stacks (see \"Control.Monad.Trans.Class\" for some
+examples).  Alternatively, it can be used with the non-portable monad
+classes in the mtl or monads-tf packages, which automatically lift
+operations introduced by monad transformers through other
+transformers.")
+    (license license:bsd-3)))
+
 (define-public ghc-transformers-base
   (package
     (name "ghc-transformers-base")
-- 
2.24.0