[GHC] #2064: problems with duplicate modules

[GHC]

#2064: problems with duplicate modules
-------------------------+--------------------------------------------------
    Reporter:  Frederik  |       Owner:          
        Type:  bug       |      Status:  new     
    Priority:  normal    |   Component:  Compiler
     Version:  6.8.2     |    Severity:  normal  
    Keywords:            |    Testcase:          
Architecture:  Unknown   |          Os:  Unknown 
-------------------------+--------------------------------------------------
 Hello, I just noticed the following minor issue. I have a cabal file which
 isn't seen by cabal except for the configuration step and to install the
 package, which I do as:

 {{{
 runhaskell Setup.hs -v register --gen-pkg-config=.package-config
 ghc-pkg update .package-config --user
 }}}

 If I duplicate a module in the Exposed-modules list then

 1. cabal doesn't complain

 2. ghc-pkg doesn't complain

 3. ghci gives a very misleading message, e.g.:

 {{{
 Could not find module `Vector.Sparse':
   it was found in multiple packages: vectro-0.2 vectro-0.2
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2064>
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