[GHC] #2522: Warning for missing export lists

[GHC]

#2522: Warning for missing export lists
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    Reporter:  tim              |       Owner:          
        Type:  feature request  |      Status:  new     
    Priority:  normal           |   Component:  Compiler
     Version:  6.8.3            |    Severity:  minor   
    Keywords:                   |    Testcase:          
Architecture:  Unknown          |          Os:  Unknown 
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 It occurred to me that it would be nice to have a warning for modules that
 lack an export list. Obviously not everybody prefers to write export lists
 for all their modules, but that's why it would be an optional warning. (It
 would also be handy to use in conjunction with {{{-fwarn-unused-binds}}}.)

 If there is already such a flag, then the task is to add it to the users'
 guide, since I don't see it there :-)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2522>
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