[Haskell-cafe] Haskell + emacs + Ghc-mod 4.0.1

[Arnaud Bailly]

OK, I forgot the —enable-tests flag to cabal install…

However, there seems to be some strange interactions I do not understand fully with the test section of cabal.
Here is the cabal file: 

name:             Thermometre
version:          0.1.0.0
synopsis:            synopsis
-- description:         
license:             PublicDomain
license-file:        LICENSE
author:              Black
-- maintainer:          
-- copyright:           
-- category:            
build-type:       Simple
cabal-version:    >= 1.8

library
  hs-source-dirs:
      src
  exposed-modules:
      Thermometre
  build-depends:
      base    == 4.*

test-suite spec
  type:
      exitcode-stdio-1.0
  ghc-options:
      -Wall -Werror
  hs-source-dirs:
      test
  main-is:
      Spec.hs
  build-depends:
      base    == 4.*
    , Thermometre
    , hspec   >= 1.3

When I remove the test-suite section and open src/Thermometre.hs I got errors highlighting which is fine. C-c C-t does not give me types however ('Cannot guess type’ message). 

When I leave the test-suite section then opening Thermometre.hs gives me a package error: ‘cannot satisfy -package Thermometre’ as there is a dependency from the tests to the main library.

How can I solve that?

Thanks
Arnaud

On 03 Apr 2014, at 23:30, Kazu Yamamoto (山本和彦) <kazu at iij.ad.jp> wrote:

>> I upgrade my emacs configuration with latest ghc-mod and all of sudden
>> nothing works (again).
>> When I try to load a .hs file from a project I got the first line
>> highlighted with the error "cannot satisfy -package spec" and I cannot got
>> type, info or doc from that file. Also I do not have anymore syntax errors
>> highlighting I used to see.
> 
> As this message suggests, you need to install spec for testing.
> 
> % cabal install spec
> 
> # I don't know what the spec package is. A typo for hspec?
> 
> This is because ghc-mod obtains dependency for executables, libraries
> *and* testing.
> 
> In general, 
> % cabal install --only-dependencies
> would help you.
> 
> --Kazu

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