[Hackage] #782: When building a plan, use installed package dependencies in preference to those from Hackage

[Hackage]

#782: When building a plan, use installed package dependencies in preference to
those from Hackage
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  Reporter:  batterseapower      |        Owner:      
      Type:  enhancement         |       Status:  new 
  Priority:  normal              |    Milestone:      
 Component:  cabal-install tool  |      Version:  HEAD
  Severity:  normal              |     Keywords:      
Difficulty:  unknown             |   Ghcversion:      
  Platform:                      |  
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Comment(by duncan):

 The dep planner does prefer installed packages to source ones, but not
 quite in the simple way you expect. This is a misfeature of the rather
 naive constraint solver algorithm that we're currently using. The solver
 is slated for a rewrite (to support the private dependencies feature) and
 hopefully this issue will be taken care of at the same time.

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/782#comment:1>
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