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bs.cabal

-- Initial bs.cabal generated by cabal init.  For further documentation, 
-- see http://haskell.org/cabal/users-guide/

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

library
  -- exposed-modules:     
  -- other-modules:       
  build-depends:       base ==4.5.*
                     , bytestring

LICENSE

Main.hs

import Data.ByteString

main = print "foo"

OUTPUT

$ ghc-mod check Main.hs


GHCi runtime linker: fatal error: I found a duplicate definition for symbol
   _fps_count
whilst processing object file
   /Users/fujimura/.cabal/lib/bytestring-0.10.0.1/ghc-7.4.2/HSbytestring-0.10.0.1.o
This could be caused by:
   * Loading two different object files which export the same symbol
   * Specifying the same object file twice on the GHCi command line
   * An incorrect `package.conf' entry, causing some object to be
     loaded twice.
GHCi cannot safely continue in this situation.  Exiting now.  Sorry.

Setup.hs

import Distribution.Simple
main = defaultMain

VERSION

$ ghc --version
The Glorious Glasgow Haskell Compilation System, version 7.4.2
$ cabal --version
cabal-install version 1.16.0.2
using version 1.16.0.3 of the Cabal library