[GHC] #2135: Warn if functions are exported whose types cannot be written

[GHC]

#2135: Warn if functions are exported whose types cannot be written
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 Reporter:  dons             |          Owner:             
     Type:  feature request  |         Status:  new        
 Priority:  normal           |      Milestone:  6.10 branch
Component:  Compiler         |        Version:  6.8.2      
 Severity:  normal           |     Resolution:             
 Keywords:  warnings         |     Difficulty:  Unknown    
 Testcase:                   |   Architecture:  Unknown    
       Os:  Unknown          |  
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Changes (by igloo):

  * milestone:  => 6.10 branch

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2135#comment:3>
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