Re: propagating inputs in ghc-* packages

[Federico Beffa <beffa@ieee.org>]

On Sun, Oct 2, 2016 at 6:21 AM, Ricardo Wurmus <rekado@elephly.net> wrote:
>> That sounds great! Just to be sure: you are saying that if you install
>> any library (call it A) and the GHC compiler into your profile then you
>> are able to compile your program (making use of library A) without
>> also having to manually install any input of library A?
>
> This seems to be the case.  Here is an example ghci session in which I’m
> using “ghc-pandoc” as a library without having to install any of the
> numerous inputs to “ghc-pandoc” (and their inputs):
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> ./pre-inst-env guix environment --ad-hoc ghc ghc-pandoc
> […]
> rekado in guix-wip [env]: ghci
> GHCi, version 7.10.2: http://www.haskell.org/ghc/  :? for help
> Prelude> import Text.Pandoc
> Prelude Text.Pandoc> readMarkdown def "Hello"
> Right (Pandoc (Meta {unMeta = fromList []}) [Para [Str "Hello"]])
> Prelude Text.Pandoc> :q
> Leaving GHCi.
> rekado in guix-wip [env]:
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Nice. Thanks for checking.