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-rw-r--r--gnu/packages/haskell-xyz.scm35
1 files changed, 35 insertions, 0 deletions
diff --git a/gnu/packages/haskell-xyz.scm b/gnu/packages/haskell-xyz.scm
index 6a4d958490..05c0524e94 100644
--- a/gnu/packages/haskell-xyz.scm
+++ b/gnu/packages/haskell-xyz.scm
@@ -7631,6 +7631,41 @@ semi-direct products, \"deletable\" monoids, \"split\" monoids, and
\"cut\" monoids.")
(license license:bsd-3)))
+(define-public ghc-mtl-compat
+ (package
+ (name "ghc-mtl-compat")
+ (version "0.2.2")
+ (source
+ (origin
+ (method url-fetch)
+ (uri (string-append
+ "mirror://hackage/package/mtl-compat/mtl-compat-"
+ version
+ ".tar.gz"))
+ (sha256
+ (base32
+ "17iszr5yb4f17g8mq6i74hsamii8z6m2qfsmgzs78mhiwa7kjm8r"))))
+ (build-system haskell-build-system)
+ (home-page
+ "https://github.com/haskell-compat/mtl-compat")
+ (synopsis
+ "Backported Control.Monad.Except module from mtl")
+ (description
+ "This package backports the Control.Monad.Except module from mtl (if
+using mtl-2.2.0.1 or earlier), which reexports the ExceptT monad transformer
+and the MonadError class.
+
+This package should only be used if there is a need to use the
+Control.Monad.Except module specifically. If you just want the mtl class
+instances for ExceptT, use transformers-compat instead, since mtl-compat does
+nothing but reexport the instances from that package.
+
+Note that unlike how mtl-2.2 or later works, the Control.Monad.Except
+module defined in this package exports all of ExceptT's monad class instances.
+Therefore, you may have to declare @code{import Control.Monad.Except ()} at
+the top of your file to get all of the ExceptT instances in scope.")
+ (license license:bsd-3)))
+
(define-public ghc-murmur-hash
(package
(name "ghc-murmur-hash")