[GHC] #3183: unhelpful wording in module error message

[GHC]

#3183: unhelpful wording in module error message
-----------------------------+----------------------------------------------
Reporter:  duncan            |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  Compiler        
 Version:  6.10.2            |       Severity:  minor           
Keywords:                    |       Testcase:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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 Users sometimes hit this error message:

 {{{
 Could not find module `Control.Monad.State':
   it was found in multiple packages: monads-fd-0.0.0.1 mtl-1.1.0.2
 }}}

 The problem is just the wording. It should say from start that the module
 was found in multiple packages, rather than saying that it was not found
 at all.

 How about:
 {{{
 Ambiguous module name `Control.Monad.State':
   it was found in multiple packages: monads-fd-0.0.0.1 mtl-1.1.0.2
 }}}

 We might also want the message to suggest the flags `-hide-all-packages`,
 `-hide-package` and/or `-package` as part of the solution.

 I'm filing this on behalf of people who ran into this while building UHC
 (which does not use Cabal and does not use the `-hide-all-packages` flag).

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3183>
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