[GHC] #7150: unjustified overlapping instances error

[GHC]

#7150: unjustified overlapping instances error
----------------------------------------+-----------------------------------
  Reporter:  maeder                     |          Owner:                  
      Type:  bug                        |         Status:  merge           
  Priority:  highest                    |      Milestone:  7.6.1           
 Component:  Compiler                   |        Version:  7.6.1-rc1       
Resolution:  worksforme                 |       Keywords:                  
        Os:  Unknown/Multiple           |   Architecture:  Unknown/Multiple
   Failure:  GHC rejects valid program  |     Difficulty:  Unknown         
  Testcase:                             |      Blockedby:                  
  Blocking:                             |        Related:                  
----------------------------------------+-----------------------------------

Comment(by maeder):

 to reproduce do

 {{{
 cabal install aterm fgl xml network utf8-string
 svn co https://svn-agbkb.informatik.uni-bremen.de/Hets/trunk Hets
 cd Hets
 make
 }}}

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7150#comment:25>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler