[GHC] #7469: GHC does not report name clashes in export lists

[GHC]

#7469: GHC does not report name clashes in export lists
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Reporter:  Feuerbach         |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  Compiler        
 Version:  7.6.1             |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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 {{{
 module A where

 a = undefined

 module B (a, module A) where

 import qualified A

 a = undefined
 }}}

 There is a name clash here which GHC does not report.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7469>
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