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| -rw-r--r-- | gnu/packages/haskell-xyz.scm | 35 |
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") |