[Haskell-beginners] ghc-mod and cabal "could not find module Prelude"

[Norbert Melzer]

Just add base as dependency in the version constraints matching that base
that is delivered with your version of GHC.

Alan Buxton <alanbuxton at gmail.com> schrieb am Di., 23.06.2015, 16:48:

> Hi
>
>
>
> I’ve recently set up a new Haskell working environment on Ubuntu 14.04. I
> installed the Ubuntu packaged version of Haskell platform.
>
>
>
> My problem is that I can’t now get ghc-mod check to work if there is a
> cabal file in the current directory.
>
>
>
>
>
> I am using:
>
> ·       ghc-mod 5.2.1.2 compiled by GHC 7.6.3
>
> ·       cabal 1.16.0.2
>
>
>
> See below an extract of trying to run ghc-mod check in a directory that
> was empty until I just ran cabal init in it:
>
>
>
> ~/tmp-ghc-mod$ ls
>
> Setup.hs  tmp-ghc-mod.cabal
>
> ~/tmp-ghc-mod$ ghc-mod check Setup.hs
>
> Setup.hs:1:1:Could not find module `Prelude'It is a member of the hidden
> package `base'.Perhaps you need to add `base' to the build-depends in your
> .cabal file.It is a member of the hidden package
> `haskell98-2.0.0.2'.Perhaps you need to add `haskell98' to the
> build-depends in your .cabal file.It is a member of the hidden package
> `haskell2010-1.1.1.0'.Perhaps you need to add `haskell2010' to the
> build-depends in your .cabal file.Use -v to see a list of the files
> searched for.
>
> ~/tmp-ghc-mod$ mv tmp-ghc-mod.cabal tmp-ghc-mod.cabal.NOT
>
> ~/tmp-ghc-mod$ ls
>
> dist  Setup.hs  tmp-ghc-mod.cabal.NOT
>
> ~/tmp-ghc-mod$ ghc-mod check Setup.hs
>
> Setup.hs:2:1:Warning: Top-level binding with no type signature: main :: IO
> ()
>
> ~/tmp-ghc-mod$
>
>
>
> So… ghc-mod behaves as expected when there is no cabal file, but doesn’t
> behave as expected if there is a cabal file.
>
>
>
> My google fu isn’t helping me out on this: the only issues I have seen are
> to do with a change in format of the cabal file in newer versions of cabal.
>
>
>
> Any ideas?
>
>
>
> Thanks
>
> Alan
>
>
>
>
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