@@ -8384,6 +8384,37 @@ 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-multistate
+ (package
+ (name "ghc-multistate")
+ (version "0.8.0.2")
+ (source
+ (origin
+ (method url-fetch)
+ (uri (string-append
+ "https://hackage.haskell.org/package/multistate/multistate-"
+ version
+ ".tar.gz"))
+ (sha256
+ (base32
+ "0hypksjacpjgpkgvjn76fd5rgdz7hi6ri36ihdy0bdhpi83jnhn5"))))
+ (build-system haskell-build-system)
+ (inputs
+ `(("ghc-tagged" ,ghc-tagged)
+ ("ghc-transformers-base" ,ghc-transformers-base)
+ ("ghc-monad-control" ,ghc-monad-control)))
+ (native-inputs `(("ghc-hspec" ,ghc-hspec)))
+ (home-page "https://github.com/lspitzner/multistate")
+ (synopsis "Similar to mtl's ReaderT/WriterT/StateT, but more than one
+contained value/type.")
+ (description "When using multiple Read/Write/State transformers in the
+same monad stack, it becomes necessary to lift the operations in order to
+affect a specific transformer. Using heterogeneous lists (and all kinds of
+GHC extensions magic), this package provides transformers that remove that
+necessity: MultiReaderT/MultiWriterT/MultiStateT/MultiRWST can contain a
+heterogeneous list of values.")
+ (license license:bsd-3)))
+
(define-public ghc-murmur-hash
(package
(name "ghc-murmur-hash")