[Haskell-beginners] Error stack install ghc-mod

[Michael Snoyman]

ghc-mod doesn't yet support GHC 8.2 or later[1]. You'll need to use an
older version of the compiler if you want ghc-mod support. If you check out
ghc-mod's Stackage page[2], you can see that the latest snapshots
supporting it are lts-8.24 and nightly-2017-06-28, so those are options if
you need ghc-mod support. Note, however, that they're relatively old, so
may be missing other things you want.

I wrote a blog post recently about selecting older snapshots for building
tools[3], which may be helpful.

[1] On the Hackage page (http://hackage.haskell.org/package/ghc-mod), you
can see that it says base < 4.10. On this page (https://www.snoyman.com/base),
you can see that 4.10 ships with GHC 8.2. base is a library which cannot be
upgraded.
[2] https://www.stackage.org/package/ghc-mod
[3] https://www.snoyman.com/blog/2018/05/building-packages-outside-snapshots

On Thu, May 24, 2018 at 1:12 PM Dinesh Amerasekara <ddinesh31 at yahoo.com>
wrote:

> Hi,
>
> When I executed the command *stack install ghc-mod*, it gave me the
> following error.
>
> In the dependencies for ghc-mod-5.8.0.0:
>
>     Cabal-2.0.1.1 from stack configuration does not match >=1.18 && <1.25
>  (latest matching version is 1.24.2.0)
>     base-4.10.1.0 from stack configuration does not match >=4.6.0.1 &&
> <4.10  (latest matching version is 4.9.1.0)
>     cabal-helper must match <0.8 && >=0.7.3.0, but the stack configuration
> has no specified version  (latest matching version is 0.7.3.0)
>     extra-1.6.2 from stack configuration does not match <1.6 && >=1.4
>  (latest matching version is 1.5.3)
>     ghc-8.2.2 from stack configuration does not match >=7.6 && <8.2
>     monad-journal-0.8.1 from stack configuration does not match <0.8 &&
> >=0.4  (latest matching version is 0.7.2)
>     optparse-applicative-0.14.0.0 from stack configuration does not match
> >=0.13.0.0 && <0.14  (latest matching version is 0.13.2.0)
>
> needed since ghc-mod is a build target.
>
> Can I get an advice to solve this error?
>
> Thanks And Best Regards,
> Dinesh
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