[GHC] #2061: ghc-pkg loops on mutually recursive package dependencies

[GHC]

#2061: ghc-pkg loops on mutually recursive package dependencies
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    Reporter:  trevor          |       Owner:        
        Type:  bug             |      Status:  new   
    Priority:  normal          |   Component:  None  
     Version:  6.8.2           |    Severity:  normal
    Keywords:                  |    Testcase:        
Architecture:  x86_64 (amd64)  |          Os:  Linux 
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 If you have two packages installed, A and B, with a dependency from B to
 A, it is possible to create a cyclic dependency by then adding a
 dependency in A to B and reinstalling it.  The result is that ghc-pkg will
 loop, not detecting the cycle.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2061>
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