Re: [PATCH] gnu: Add ghc-free.

[ericbavier]

From: Eric Bavier <address@hidden>

> * 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
> address@hidden 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
>