[Hackage] #319: Warn if the source file for a module is ambigious.

[Hackage]

#319: Warn if the source file for a module is ambigious.
----------------------------+-----------------------------------------------
  Reporter:  duncan         |        Owner:       
      Type:  enhancement    |       Status:  new  
  Priority:  normal         |    Milestone:       
 Component:  Cabal library  |      Version:  HEAD 
  Severity:  normal         |     Keywords:       
Difficulty:  normal         |   Ghcversion:  6.8.2
  Platform:                 |  
----------------------------+-----------------------------------------------
 For example if we are looking for a module `Foo` and there are files
 `Foo.hs` and `Foo.y` then we should use `Foo.y` as we do now, but we
 should warn about the presence of `Foo.hs` (and note the fact that we're
 ignoring it).

 Similarly if we find `Foo.x` and `Foo.y` then we should warn about the one
 we're not using. Or arguably that should be a straight error. There's an
 obvious order relation between `Foo.hs` and `Foo.y` but not between
 `Foo.x` and `Foo.y`.

-- 
Ticket URL: <http://hackage.haskell.org/trac/hackage/ticket/319>
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