From: Eric Bavier <ericbav...@openmailbox.org>
> * gnu/packages/haskell.scm (ghc-free): New variable.
> ---
> gnu/packages/haskell.scm | 37 +++++++++++++++++++++++++++++++++++++
> 1 file changed, 37 insertions(+)
>
> diff --git a/gnu/packages/haskell.scm b/gnu/packages/haskell.scm
> index 729deb3..d280172 100644
> --- a/gnu/packages/haskell.scm
> +++ b/gnu/packages/haskell.scm
> @@ -3262,6 +3262,43 @@ where every element did not have to have an inverse,
> thus the name
> semigroup.")
> (license bsd-3)))
>
> +(define-public ghc-free
> + (package
> + (name "ghc-free")
> + (version "4.12.1")
> + (source
> + (origin
> + (method url-fetch)
> + (uri (string-append
> + "http://hackage.haskell.org/package/free/free-";
> + version
> + ".tar.gz"))
> + (sha256
> + (base32
> + "0sr8phvrb4ny8j1wzq55rdn8q4br23q4pw2j276npr844825jr9p"))))
> + (build-system haskell-build-system)
> + (propagated-inputs
> + `(("ghc-prelude-extras" ,ghc-prelude-extras)
> + ("ghc-profunctors" ,ghc-profunctors)
> + ("ghc-exceptions" ,ghc-exceptions)))
> + (inputs
> + `(("ghc-bifunctors" ,ghc-bifunctors)
> + ("ghc-comonad" ,ghc-comonad)
> + ("ghc-distributive" ,ghc-distributive)
> + ("ghc-mtl" ,ghc-mtl)
> + ("ghc-semigroupoids" ,ghc-semigroupoids)
> + ("ghc-semigroups" ,ghc-semigroups)))
> + (home-page "http://github.com/ekmett/free/";)
> + (synopsis "Monads for free")
How about: "Unrestricted monads for Haskell"
`~Eric
> + (description "This library provides free monads, which are useful for
> many
> +tree-like structures and domain specific languages. If @code{f} is a
> +@code{Functor} then the free @code{Monad} on @code{f} is the type of trees
> +whose nodes are labeled with the constructors of @code{f}. The word \"free\"
> +is used in the sense of \"unrestricted\" rather than \"zero-cost\":
> @code{Free
> +f} makes no constraining assumptions beyond those given by @code{f} and the
> +definition of @code{Monad}.")
> + (license bsd-3)))
> +
> (define-public ghc-fast-logger
> (package
> (name "ghc-fast-logger")
> --
> 2.5.0
>
